diff --git a/src/ert/config/design_matrix.py b/src/ert/config/design_matrix.py
index 25c200ba35e..f866766e41c 100644
--- a/src/ert/config/design_matrix.py
+++ b/src/ert/config/design_matrix.py
@@ -29,10 +29,12 @@ class DesignMatrix:
     xls_filename: Path
     design_sheet: str
     default_sheet: str
-    num_realizations: Optional[int] = None
-    active_realizations: Optional[List[bool]] = None
-    design_matrix_df: Optional[pd.DataFrame] = None
-    parameter_configuration: Optional[Dict[str, ParameterConfig]] = None
+
+    def __post_init__(self) -> None:
+        self.num_realizations: Optional[int] = None
+        self.active_realizations: Optional[List[bool]] = None
+        self.design_matrix_df: Optional[pd.DataFrame] = None
+        self.parameter_configuration: Optional[Dict[str, ParameterConfig]] = None
 
     @classmethod
     def from_config_list(cls, config_list: List[str]) -> "DesignMatrix":
diff --git a/src/ert/config/ensemble_config.py b/src/ert/config/ensemble_config.py
index 91026bde8e6..24ffc6be561 100644
--- a/src/ert/config/ensemble_config.py
+++ b/src/ert/config/ensemble_config.py
@@ -15,7 +15,8 @@
 
 from ert.field_utils import get_shape
 
-from .field import Field
+from .ext_param_config import ExtParamConfig
+from .field import Field as FieldConfig
 from .gen_data_config import GenDataConfig
 from .gen_kw_config import GenKwConfig
 from .parameter_config import ParameterConfig
@@ -49,8 +50,12 @@ def _get_abs_path(file: Optional[str]) -> Optional[str]:
 @dataclass
 class EnsembleConfig:
     grid_file: Optional[str] = None
-    response_configs: Dict[str, ResponseConfig] = field(default_factory=dict)
-    parameter_configs: Dict[str, ParameterConfig] = field(default_factory=dict)
+    response_configs: Dict[str, Union[SummaryConfig, GenDataConfig]] = field(
+        default_factory=dict
+    )
+    parameter_configs: Dict[
+        str, GenKwConfig | FieldConfig | SurfaceConfig | ExtParamConfig
+    ] = field(default_factory=dict)
     refcase: Optional[Refcase] = None
 
     def __post_init__(self) -> None:
@@ -92,7 +97,7 @@ def from_dict(cls, config_dict: ConfigDict) -> EnsembleConfig:
                     grid_file_path,
                 ) from err
 
-        def make_field(field_list: List[str]) -> Field:
+        def make_field(field_list: List[str]) -> FieldConfig:
             if grid_file_path is None:
                 raise ConfigValidationError.with_context(
                     "In order to use the FIELD keyword, a GRID must be supplied.",
@@ -103,7 +108,7 @@ def make_field(field_list: List[str]) -> Field:
                     f"Grid file {grid_file_path} did not contain dimensions",
                     grid_file_path,
                 )
-            return Field.from_config_list(grid_file_path, dims, field_list)
+            return FieldConfig.from_config_list(grid_file_path, dims, field_list)
 
         parameter_configs = (
             [GenKwConfig.from_config_list(g) for g in gen_kw_list]
@@ -152,21 +157,6 @@ def hasNodeGenData(self, key: str) -> bool:
         config = self.response_configs["gen_data"]
         return key in config.keys
 
-    def addNode(self, config_node: Union[ParameterConfig, ResponseConfig]) -> None:
-        assert config_node is not None
-        if config_node.name in self:
-            raise ConfigValidationError(
-                f"Config node with key {config_node.name!r} already present in ensemble config"
-            )
-
-        if isinstance(config_node, ParameterConfig):
-            logger.info(
-                f"Adding {type(config_node).__name__} config (of size {len(config_node)}) to parameter_configs"
-            )
-            self.parameter_configs[config_node.name] = config_node
-        else:
-            self.response_configs[config_node.name] = config_node
-
     def get_keylist_gen_kw(self) -> List[str]:
         return [
             val.name
diff --git a/src/ert/config/ert_config.py b/src/ert/config/ert_config.py
index 4c3241be5cb..61d5032439d 100644
--- a/src/ert/config/ert_config.py
+++ b/src/ert/config/ert_config.py
@@ -4,13 +4,14 @@
 import logging
 import os
 from collections import defaultdict
-from dataclasses import dataclass, field
+from dataclasses import field
 from datetime import datetime
 from os import path
 from pathlib import Path
 from typing import (
     Any,
     ClassVar,
+    DefaultDict,
     Dict,
     List,
     Optional,
@@ -24,6 +25,8 @@
 
 import polars
 from pydantic import ValidationError as PydanticValidationError
+from pydantic import field_validator
+from pydantic.dataclasses import dataclass
 from typing_extensions import Self
 
 from ert.plugins import ErtPluginManager
@@ -49,6 +52,7 @@
     ConfigWarning,
     ErrorInfo,
     ForwardModelStepKeys,
+    HistorySource,
     HookRuntime,
     init_forward_model_schema,
     init_site_config_schema,
@@ -256,7 +260,9 @@ class ErtConfig:
     queue_config: QueueConfig = field(default_factory=QueueConfig)
     workflow_jobs: Dict[str, WorkflowJob] = field(default_factory=dict)
     workflows: Dict[str, Workflow] = field(default_factory=dict)
-    hooked_workflows: Dict[HookRuntime, List[Workflow]] = field(default_factory=dict)
+    hooked_workflows: DefaultDict[HookRuntime, List[Workflow]] = field(
+        default_factory=lambda: defaultdict(list)
+    )
     runpath_file: Path = Path(DEFAULT_RUNPATH_FILE)
     ert_templates: List[Tuple[str, str]] = field(default_factory=list)
     installed_forward_model_steps: Dict[str, ForwardModelStep] = field(
@@ -269,6 +275,14 @@ class ErtConfig:
     observation_config: List[
         Tuple[str, Union[HistoryValues, SummaryValues, GenObsValues]]
     ] = field(default_factory=list)
+    enkf_obs: EnkfObs = field(default_factory=EnkfObs)
+
+    @field_validator("substitutions", mode="before")
+    @classmethod
+    def convert_to_substitutions(cls, v: Dict[str, str]) -> Substitutions:
+        if isinstance(v, Substitutions):
+            return v
+        return Substitutions(v)
 
     def __eq__(self, other: object) -> bool:
         if not isinstance(other, ErtConfig):
@@ -298,8 +312,6 @@ def __post_init__(self) -> None:
             if self.user_config_file
             else os.getcwd()
         )
-        self.enkf_obs: EnkfObs = self._create_observations(self.observation_config)
-
         self.observations: Dict[str, polars.DataFrame] = self.enkf_obs.datasets
 
     @staticmethod
@@ -456,7 +468,7 @@ def from_dict(cls, config_dict) -> Self:
             errors.append(err)
 
         obs_config_file = config_dict.get(ConfigKeys.OBS_CONFIG)
-        obs_config_content = None
+        obs_config_content = []
         try:
             if obs_config_file:
                 if path.isfile(obs_config_file) and path.getsize(obs_config_file) == 0:
@@ -487,6 +499,19 @@ def from_dict(cls, config_dict) -> Self:
                         [key] for key in summary_obs if key not in summary_keys
                     ]
             ensemble_config = EnsembleConfig.from_dict(config_dict=config_dict)
+            if model_config:
+                observations = cls._create_observations(
+                    obs_config_content,
+                    ensemble_config,
+                    model_config.time_map,
+                    model_config.history_source,
+                )
+            else:
+                errors.append(
+                    ConfigValidationError(
+                        "Not possible to validate observations without valid model config"
+                    )
+                )
         except ConfigValidationError as err:
             errors.append(err)
 
@@ -519,6 +544,7 @@ def from_dict(cls, config_dict) -> Self:
             model_config=model_config,
             user_config_file=config_file_path,
             observation_config=obs_config_content,
+            enkf_obs=observations,
         )
 
     @classmethod
@@ -970,24 +996,25 @@ def _installed_forward_model_steps_from_dict(
     def preferred_num_cpu(self) -> int:
         return int(self.substitutions.get(f"<{ConfigKeys.NUM_CPU}>", 1))
 
+    @staticmethod
     def _create_observations(
-        self,
         obs_config_content: Optional[
             Dict[str, Union[HistoryValues, SummaryValues, GenObsValues]]
         ],
+        ensemble_config: EnsembleConfig,
+        time_map: Optional[List[datetime]],
+        history: HistorySource,
     ) -> EnkfObs:
         if not obs_config_content:
             return EnkfObs({}, [])
         obs_vectors: Dict[str, ObsVector] = {}
         obs_time_list: Sequence[datetime] = []
-        if self.ensemble_config.refcase is not None:
-            obs_time_list = self.ensemble_config.refcase.all_dates
-        elif self.model_config.time_map is not None:
-            obs_time_list = self.model_config.time_map
+        if ensemble_config.refcase is not None:
+            obs_time_list = ensemble_config.refcase.all_dates
+        elif time_map is not None:
+            obs_time_list = time_map
 
-        history = self.model_config.history_source
         time_len = len(obs_time_list)
-        ensemble_config = self.ensemble_config
         config_errors: List[ErrorInfo] = []
         for obs_name, values in obs_config_content:
             try:
@@ -1059,7 +1086,7 @@ def _get_files_in_directory(job_path, errors):
 
 
 def _substitutions_from_dict(config_dict) -> Substitutions:
-    subst_list = Substitutions()
+    subst_list = {}
 
     for key, val in config_dict.get("DEFINE", []):
         subst_list[key] = val
@@ -1077,7 +1104,7 @@ def _substitutions_from_dict(config_dict) -> Substitutions:
     for key, val in config_dict.get("DATA_KW", []):
         subst_list[key] = val
 
-    return subst_list
+    return Substitutions(subst_list)
 
 
 @no_type_check
diff --git a/src/ert/config/field.py b/src/ert/config/field.py
index 520ff9d82d1..79691f83bbc 100644
--- a/src/ert/config/field.py
+++ b/src/ert/config/field.py
@@ -3,13 +3,13 @@
 import logging
 import os
 import time
-from dataclasses import dataclass
 from functools import cached_property
 from pathlib import Path
 from typing import TYPE_CHECKING, Any, List, Optional, Union, overload
 
 import numpy as np
 import xarray as xr
+from pydantic.dataclasses import dataclass
 from typing_extensions import Self
 
 from ert.field_utils import FieldFileFormat, Shape, read_field, read_mask, save_field
diff --git a/src/ert/config/forward_model_step.py b/src/ert/config/forward_model_step.py
index 8e5026e7805..04a353e2a7b 100644
--- a/src/ert/config/forward_model_step.py
+++ b/src/ert/config/forward_model_step.py
@@ -5,12 +5,14 @@
 from dataclasses import dataclass, field
 from typing import (
     ClassVar,
+    Dict,
     Literal,
     Optional,
     TypedDict,
     Union,
 )
 
+from pydantic import field_validator
 from typing_extensions import NotRequired, Unpack
 
 from ert.config.parsing.config_errors import ConfigWarning
@@ -172,6 +174,13 @@ class ForwardModelStep:
         "_ERT_RUNPATH": "<RUNPATH>",
     }
 
+    @field_validator("private_args", mode="before")
+    @classmethod
+    def convert_to_substitutions(cls, v: Dict[str, str]) -> Substitutions:
+        if isinstance(v, Substitutions):
+            return v
+        return Substitutions(v)
+
     def validate_pre_experiment(self, fm_step_json: ForwardModelStepJSON) -> None:
         """
         Raise errors pertaining to the environment not being
diff --git a/src/ert/config/general_observation.py b/src/ert/config/general_observation.py
index d2a31ccc07b..40744641f7a 100644
--- a/src/ert/config/general_observation.py
+++ b/src/ert/config/general_observation.py
@@ -1,17 +1,17 @@
 from __future__ import annotations
 
 from dataclasses import dataclass
+from typing import List
 
 import numpy as np
-import numpy.typing as npt
 
 
 @dataclass(eq=False)
 class GenObservation:
-    values: npt.NDArray[np.double]
-    stds: npt.NDArray[np.double]
-    indices: npt.NDArray[np.int32]
-    std_scaling: npt.NDArray[np.double]
+    values: List[float]
+    stds: List[float]
+    indices: List[int]
+    std_scaling: List[float]
 
     def __post_init__(self) -> None:
         for val in self.stds:
diff --git a/src/ert/config/observations.py b/src/ert/config/observations.py
index dd204b45e81..b89d1f2fbc2 100644
--- a/src/ert/config/observations.py
+++ b/src/ert/config/observations.py
@@ -1,5 +1,5 @@
 import os
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from datetime import datetime, timedelta
 from pathlib import Path
 from typing import TYPE_CHECKING, Dict, Iterator, List, Optional, Tuple, Union
@@ -39,8 +39,8 @@ def history_key(key: str) -> str:
 
 @dataclass
 class EnkfObs:
-    obs_vectors: Dict[str, ObsVector]
-    obs_time: List[datetime]
+    obs_vectors: Dict[str, ObsVector] = field(default_factory=dict)
+    obs_time: List[datetime] = field(default_factory=list)
 
     def __post_init__(self) -> None:
         grouped: Dict[str, List[polars.DataFrame]] = {}
@@ -394,7 +394,9 @@ def _create_gen_obs(
                 f"index list ({indices}) must be of equal length",
                 obs_file if obs_file is not None else "",
             )
-        return GenObservation(values, stds, indices, std_scaling)
+        return GenObservation(
+            values.tolist(), stds.tolist(), indices.tolist(), std_scaling.tolist()
+        )
 
     @classmethod
     def _handle_general_observation(
diff --git a/src/ert/config/queue_config.py b/src/ert/config/queue_config.py
index 9ed6653b263..61a76f68acc 100644
--- a/src/ert/config/queue_config.py
+++ b/src/ert/config/queue_config.py
@@ -8,7 +8,6 @@
 from typing import Any, Dict, List, Literal, Mapping, Optional, Union, no_type_check
 
 import pydantic
-from pydantic import Field
 from pydantic.dataclasses import dataclass
 from typing_extensions import Annotated
 
@@ -270,7 +269,7 @@ class QueueConfig:
     queue_system: QueueSystem = QueueSystem.LOCAL
     queue_options: Union[
         LsfQueueOptions, TorqueQueueOptions, SlurmQueueOptions, LocalQueueOptions
-    ] = Field(default_factory=LocalQueueOptions, discriminator="name")
+    ] = pydantic.Field(default_factory=LocalQueueOptions, discriminator="name")
     queue_options_test_run: LocalQueueOptions = field(default_factory=LocalQueueOptions)
     stop_long_running: bool = False
 
diff --git a/src/ert/config/refcase.py b/src/ert/config/refcase.py
index f5c1fbb4964..3c62873f1a3 100644
--- a/src/ert/config/refcase.py
+++ b/src/ert/config/refcase.py
@@ -1,14 +1,12 @@
 from dataclasses import dataclass
 from datetime import datetime
 from typing import (
-    Any,
     List,
     Optional,
     Sequence,
 )
 
 import numpy as np
-import numpy.typing as npt
 
 from ._read_summary import read_summary
 from .parsing.config_dict import ConfigDict
@@ -21,7 +19,7 @@ class Refcase:
     start_date: datetime
     keys: List[str]
     dates: Sequence[datetime]
-    values: npt.NDArray[Any]
+    values: List[List[float]]
 
     def __eq__(self, other: object) -> bool:
         if not isinstance(other, Refcase):
@@ -50,5 +48,7 @@ def from_config_dict(cls, config_dict: ConfigDict) -> Optional["Refcase"]:
                 raise ConfigValidationError(f"Could not read refcase: {err}") from err
 
         return (
-            cls(start_date, refcase_keys, time_map, data) if data is not None else None
+            cls(start_date, refcase_keys, time_map, data.tolist())
+            if data is not None
+            else None
         )
diff --git a/src/ert/config/workflow.py b/src/ert/config/workflow.py
index 9016401a8b9..7f5d3f3d93a 100644
--- a/src/ert/config/workflow.py
+++ b/src/ert/config/workflow.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import os
+from dataclasses import dataclass
 from typing import TYPE_CHECKING, Any, Dict, Iterator, List, Optional, Tuple
 
 from .parsing import ConfigValidationError, ErrorInfo, init_workflow_schema, parse
@@ -11,14 +12,10 @@
     from .workflow_job import WorkflowJob
 
 
+@dataclass
 class Workflow:
-    def __init__(
-        self,
-        src_file: str,
-        cmd_list: List[Tuple[WorkflowJob, Any]],
-    ):
-        self.src_file = src_file
-        self.cmd_list = cmd_list
+    src_file: str
+    cmd_list: List[Tuple[WorkflowJob, Any]]
 
     def __len__(self) -> int:
         return len(self.cmd_list)
diff --git a/src/ert/config/workflow_job.py b/src/ert/config/workflow_job.py
index af816329ec1..4eea83c515d 100644
--- a/src/ert/config/workflow_job.py
+++ b/src/ert/config/workflow_job.py
@@ -82,7 +82,7 @@ def from_file(cls, config_file: str, name: Optional[str] = None) -> "WorkflowJob
         arg_types_list = cls._make_arg_types_list(content_dict)
         return cls(
             name=name,
-            internal=content_dict.get("INTERNAL"),  # type: ignore
+            internal=bool(content_dict.get("INTERNAL", False)),  # type: ignore
             min_args=content_dict.get("MIN_ARG"),  # type: ignore
             max_args=content_dict.get("MAX_ARG"),  # type: ignore
             arg_types=arg_types_list,
diff --git a/src/ert/substitutions.py b/src/ert/substitutions.py
index bf1973a04d4..bda5dc09983 100644
--- a/src/ert/substitutions.py
+++ b/src/ert/substitutions.py
@@ -2,7 +2,11 @@
 
 import logging
 import re
-from typing import Optional
+from typing import Any, Optional
+
+from pydantic import GetCoreSchemaHandler, GetJsonSchemaHandler
+from pydantic.json_schema import JsonSchemaValue
+from pydantic_core import core_schema
 
 logger = logging.getLogger(__name__)
 _PATTERN = re.compile("<[^<>]+>")
@@ -67,6 +71,41 @@ def __repr__(self) -> str:
     def __str__(self) -> str:
         return f"Substitutions({self._concise_representation()})"
 
+    @classmethod
+    def __get_pydantic_core_schema__(
+        cls,
+        _source_type: Any,
+        _handler: GetCoreSchemaHandler,
+    ) -> core_schema.CoreSchema:
+        def _serialize(instance: Any, info: Any) -> Any:
+            return dict(instance)
+
+        from_str_schema = core_schema.chain_schema(
+            [
+                core_schema.str_schema(),
+                core_schema.no_info_plain_validator_function(cls),
+            ]
+        )
+
+        return core_schema.json_or_python_schema(
+            json_schema=from_str_schema,
+            python_schema=core_schema.union_schema(
+                [
+                    from_str_schema,
+                    core_schema.is_instance_schema(cls),
+                ]
+            ),
+            serialization=core_schema.plain_serializer_function_ser_schema(
+                _serialize, info_arg=True
+            ),
+        )
+
+    @classmethod
+    def __get_pydantic_json_schema__(
+        cls, _core_schema: core_schema.CoreSchema, handler: GetJsonSchemaHandler
+    ) -> JsonSchemaValue:
+        return handler(core_schema.str_schema())
+
 
 def _replace_strings(subst_list: Substitutions, string: str) -> Optional[str]:
     start = 0
diff --git a/src/everest/simulator/everest_to_ert.py b/src/everest/simulator/everest_to_ert.py
index 8916f481489..5151172d3c2 100644
--- a/src/everest/simulator/everest_to_ert.py
+++ b/src/everest/simulator/everest_to_ert.py
@@ -538,12 +538,10 @@ def _get_variables(
     # configuration key. When initializing an ERT config object, it is ignored.
     # It is used by the Simulator object to inject ExtParamConfig nodes.
     for control in ever_config.controls or []:
-        ens_config.addNode(
-            ExtParamConfig(
-                name=control.name,
-                input_keys=_get_variables(control.variables),
-                output_file=control.name + ".json",
-            )
+        ens_config.parameter_configs[control.name] = ExtParamConfig(
+            name=control.name,
+            input_keys=_get_variables(control.variables),
+            output_file=control.name + ".json",
         )
 
     return ert_config
diff --git a/tests/ert/unit_tests/config/observations_generator.py b/tests/ert/unit_tests/config/observations_generator.py
index 90da212276f..9853ab2113c 100644
--- a/tests/ert/unit_tests/config/observations_generator.py
+++ b/tests/ert/unit_tests/config/observations_generator.py
@@ -137,7 +137,7 @@ def general_observations(draw, ensemble_keys, std_cutoff, names):
     }
     val_type = draw(st.sampled_from(["value", "obs_file"]))
     if val_type == "value":
-        kws["value"] = draw(st.floats(allow_nan=False))
+        kws["value"] = draw(st.floats(allow_nan=False, allow_infinity=False))
     if val_type == "obs_file":
         kws["obs_file"] = draw(names)
         kws["error"] = None
@@ -243,7 +243,10 @@ def observations(draw, ensemble_keys, summary_keys, std_cutoff, start_date):
             st.builds(
                 HistoryObservation,
                 error=st.floats(
-                    min_value=std_cutoff, allow_nan=False, allow_infinity=False
+                    min_value=std_cutoff,
+                    max_value=1e20,
+                    allow_nan=False,
+                    allow_infinity=False,
                 ),
                 segment=st.lists(
                     st.builds(
@@ -253,12 +256,14 @@ def observations(draw, ensemble_keys, summary_keys, std_cutoff, start_date):
                         stop=st.integers(min_value=1, max_value=10),
                         error=st.floats(
                             min_value=0.01,
+                            max_value=1e20,
                             allow_nan=False,
                             allow_infinity=False,
                             exclude_min=True,
                         ),
                         error_min=st.floats(
                             min_value=0.0,
+                            max_value=1e20,
                             allow_nan=False,
                             allow_infinity=False,
                             exclude_min=True,
diff --git a/tests/ert/unit_tests/config/test_ert_config.py b/tests/ert/unit_tests/config/test_ert_config.py
index 9accd20c4a8..0e95a057738 100644
--- a/tests/ert/unit_tests/config/test_ert_config.py
+++ b/tests/ert/unit_tests/config/test_ert_config.py
@@ -11,6 +11,7 @@
 import pytest
 from hypothesis import assume, given, settings
 from hypothesis import strategies as st
+from pydantic import RootModel, TypeAdapter
 
 from ert.config import AnalysisConfig, ConfigValidationError, ErtConfig, HookRuntime
 from ert.config.ert_config import (
@@ -26,7 +27,6 @@
     ContextList,
     ContextString,
 )
-from ert.config.parsing.observations_parser import ObservationConfigError
 from ert.config.parsing.queue_system import QueueSystem
 
 from .config_dict_generator import config_generators
@@ -456,6 +456,25 @@ def test_that_creating_ert_config_from_dict_is_same_as_from_file(
 
 
 @pytest.mark.integration_test
+@pytest.mark.filterwarnings("ignore::ert.config.ConfigWarning")
+@pytest.mark.usefixtures("set_site_config")
+@settings(max_examples=20)
+@given(config_generators())
+def test_that_ert_config_is_serializable(tmp_path_factory, config_generator):
+    filename = "config.ert"
+    with config_generator(tmp_path_factory, filename) as config_values:
+        ert_config = ErtConfig.from_dict(
+            config_values.to_config_dict("config.ert", os.getcwd())
+        )
+        config_json = json.loads(RootModel[ErtConfig](ert_config).model_dump_json())
+        from_json = ErtConfig(**config_json)
+        assert from_json == ert_config
+
+
+def test_that_ert_config_has_valid_schema():
+    TypeAdapter(ErtConfig).json_schema()
+
+
 @pytest.mark.filterwarnings("ignore::ert.config.ConfigWarning")
 @pytest.mark.usefixtures("set_site_config")
 @settings(max_examples=10)
@@ -1378,7 +1397,7 @@ def test_no_timemap_or_refcase_provides_clear_error():
             print(line, end="")
 
     with pytest.raises(
-        ObservationConfigError,
+        ConfigValidationError,
         match="Missing REFCASE or TIME_MAP for observations: WPR_DIFF_1",
     ):
         ErtConfig.from_file("snake_oil.ert")
@@ -1419,7 +1438,7 @@ def test_that_multiple_errors_are_shown_when_generating_observations():
                 continue
             print(line, end="")
 
-    with pytest.raises(ObservationConfigError) as err:
+    with pytest.raises(ConfigValidationError) as err:
         _ = ErtConfig.from_file("snake_oil.ert")
 
     expected_errors = [
diff --git a/tests/ert/unit_tests/config/test_observations.py b/tests/ert/unit_tests/config/test_observations.py
index ace152a3ad5..c32fb8b3c5c 100644
--- a/tests/ert/unit_tests/config/test_observations.py
+++ b/tests/ert/unit_tests/config/test_observations.py
@@ -4,7 +4,6 @@
 from pathlib import Path
 from textwrap import dedent
 
-import numpy as np
 import pytest
 from hypothesis import given, settings
 from hypothesis import strategies as st
@@ -181,10 +180,10 @@ def test_summary_obs_invalid_observation_std(std):
 def test_gen_obs_invalid_observation_std(std):
     with pytest.raises(ValueError, match="must be strictly > 0"):
         GenObservation(
-            np.array(range(len(std))),
-            np.array(std),
-            np.array(range(len(std))),
-            np.array(range(len(std))),
+            list(range(len(std))),
+            list(std),
+            list(range(len(std))),
+            list(range(len(std))),
         )
 
 
@@ -303,7 +302,7 @@ def test_that_index_list_is_read(tmpdir):
             )
 
         observations = ErtConfig.from_file("config.ert").enkf_obs
-        assert observations["OBS"].observations[0].indices.tolist() == [0, 2, 4, 6, 8]
+        assert observations["OBS"].observations[0].indices == [0, 2, 4, 6, 8]
 
 
 def test_that_index_file_is_read(tmpdir):
@@ -337,7 +336,7 @@ def test_that_index_file_is_read(tmpdir):
             )
 
         observations = ErtConfig.from_file("config.ert").enkf_obs
-        assert observations["OBS"].observations[0].indices.tolist() == [0, 2, 4, 6, 8]
+        assert observations["OBS"].observations[0].indices == [0, 2, 4, 6, 8]
 
 
 def test_that_missing_obs_file_raises_exception(tmpdir):
diff --git a/tests/ert/unit_tests/data/snapshots/test_integration_data/test_all_measured_snapshot/0/snake_oil_measured_output.csv b/tests/ert/unit_tests/data/snapshots/test_integration_data/test_all_measured_snapshot/0/snake_oil_measured_output.csv
index 374643657d6..9cbfdf28683 100644
--- a/tests/ert/unit_tests/data/snapshots/test_integration_data/test_all_measured_snapshot/0/snake_oil_measured_output.csv
+++ b/tests/ert/unit_tests/data/snapshots/test_integration_data/test_all_measured_snapshot/0/snake_oil_measured_output.csv
@@ -1,9 +1,9 @@
 observation_key,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,FOPR,WOPR_OP1_108,WOPR_OP1_144,WOPR_OP1_190,WOPR_OP1_36,WOPR_OP1_72,WOPR_OP1_9,WPR_DIFF_1,WPR_DIFF_1,WPR_DIFF_1,WPR_DIFF_1
 key_index,2010-01-10 00:00:00.000,2010-01-20 00:00:00.000,2010-01-30 00:00:00.000,2010-02-09 00:00:00.000,2010-02-19 00:00:00.000,2010-03-01 00:00:00.000,2010-03-11 00:00:00.000,2010-03-21 00:00:00.000,2010-03-31 00:00:00.000,2010-04-10 00:00:00.000,2010-04-20 00:00:00.000,2010-04-30 00:00:00.000,2010-05-10 00:00:00.000,2010-05-20 00:00:00.000,2010-05-30 00:00:00.000,2010-06-09 00:00:00.000,2010-06-19 00:00:00.000,2010-06-29 00:00:00.000,2010-07-09 00:00:00.000,2010-07-19 00:00:00.000,2010-07-29 00:00:00.000,2010-08-08 00:00:00.000,2010-08-18 00:00:00.000,2010-08-28 00:00:00.000,2010-09-07 00:00:00.000,2010-09-17 00:00:00.000,2010-09-27 00:00:00.000,2010-10-07 00:00:00.000,2010-10-17 00:00:00.000,2010-10-27 00:00:00.000,2010-11-06 00:00:00.000,2010-11-16 00:00:00.000,2010-11-26 00:00:00.000,2010-12-06 00:00:00.000,2010-12-16 00:00:00.000,2010-12-26 00:00:00.000,2011-01-05 00:00:00.000,2011-01-15 00:00:00.000,2011-01-25 00:00:00.000,2011-02-04 00:00:00.000,2011-02-14 00:00:00.000,2011-02-24 00:00:00.000,2011-03-06 00:00:00.000,2011-03-16 00:00:00.000,2011-03-26 00:00:00.000,2011-04-05 00:00:00.000,2011-04-15 00:00:00.000,2011-04-25 00:00:00.000,2011-05-05 00:00:00.000,2011-05-15 00:00:00.000,2011-05-25 00:00:00.000,2011-06-04 00:00:00.000,2011-06-14 00:00:00.000,2011-06-24 00:00:00.000,2011-07-04 00:00:00.000,2011-07-14 00:00:00.000,2011-07-24 00:00:00.000,2011-08-03 00:00:00.000,2011-08-13 00:00:00.000,2011-08-23 00:00:00.000,2011-09-02 00:00:00.000,2011-09-12 00:00:00.000,2011-09-22 00:00:00.000,2011-10-02 00:00:00.000,2011-10-12 00:00:00.000,2011-10-22 00:00:00.000,2011-11-01 00:00:00.000,2011-11-11 00:00:00.000,2011-11-21 00:00:00.000,2011-12-01 00:00:00.000,2011-12-11 00:00:00.000,2011-12-21 00:00:00.000,2011-12-31 00:00:00.000,2012-01-10 00:00:00.000,2012-01-20 00:00:00.000,2012-01-30 00:00:00.000,2012-02-09 00:00:00.000,2012-02-19 00:00:00.000,2012-02-29 00:00:00.000,2012-03-10 00:00:00.000,2012-03-20 00:00:00.000,2012-03-30 00:00:00.000,2012-04-09 00:00:00.000,2012-04-19 00:00:00.000,2012-04-29 00:00:00.000,2012-05-09 00:00:00.000,2012-05-19 00:00:00.000,2012-05-29 00:00:00.000,2012-06-08 00:00:00.000,2012-06-18 00:00:00.000,2012-06-28 00:00:00.000,2012-07-08 00:00:00.000,2012-07-18 00:00:00.000,2012-07-28 00:00:00.000,2012-08-07 00:00:00.000,2012-08-17 00:00:00.000,2012-08-27 00:00:00.000,2012-09-06 00:00:00.000,2012-09-16 00:00:00.000,2012-09-26 00:00:00.000,2012-10-06 00:00:00.000,2012-10-16 00:00:00.000,2012-10-26 00:00:00.000,2012-11-05 00:00:00.000,2012-11-15 00:00:00.000,2012-11-25 00:00:00.000,2012-12-05 00:00:00.000,2012-12-15 00:00:00.000,2012-12-25 00:00:00.000,2013-01-04 00:00:00.000,2013-01-14 00:00:00.000,2013-01-24 00:00:00.000,2013-02-03 00:00:00.000,2013-02-13 00:00:00.000,2013-02-23 00:00:00.000,2013-03-05 00:00:00.000,2013-03-15 00:00:00.000,2013-03-25 00:00:00.000,2013-04-04 00:00:00.000,2013-04-14 00:00:00.000,2013-04-24 00:00:00.000,2013-05-04 00:00:00.000,2013-05-14 00:00:00.000,2013-05-24 00:00:00.000,2013-06-03 00:00:00.000,2013-06-13 00:00:00.000,2013-06-23 00:00:00.000,2013-07-03 00:00:00.000,2013-07-13 00:00:00.000,2013-07-23 00:00:00.000,2013-08-02 00:00:00.000,2013-08-12 00:00:00.000,2013-08-22 00:00:00.000,2013-09-01 00:00:00.000,2013-09-11 00:00:00.000,2013-09-21 00:00:00.000,2013-10-01 00:00:00.000,2013-10-11 00:00:00.000,2013-10-21 00:00:00.000,2013-10-31 00:00:00.000,2013-11-10 00:00:00.000,2013-11-20 00:00:00.000,2013-11-30 00:00:00.000,2013-12-10 00:00:00.000,2013-12-20 00:00:00.000,2013-12-30 00:00:00.000,2014-01-09 00:00:00.000,2014-01-19 00:00:00.000,2014-01-29 00:00:00.000,2014-02-08 00:00:00.000,2014-02-18 00:00:00.000,2014-02-28 00:00:00.000,2014-03-10 00:00:00.000,2014-03-20 00:00:00.000,2014-03-30 00:00:00.000,2014-04-09 00:00:00.000,2014-04-19 00:00:00.000,2014-04-29 00:00:00.000,2014-05-09 00:00:00.000,2014-05-19 00:00:00.000,2014-05-29 00:00:00.000,2014-06-08 00:00:00.000,2014-06-18 00:00:00.000,2014-06-28 00:00:00.000,2014-07-08 00:00:00.000,2014-07-18 00:00:00.000,2014-07-28 00:00:00.000,2014-08-07 00:00:00.000,2014-08-17 00:00:00.000,2014-08-27 00:00:00.000,2014-09-06 00:00:00.000,2014-09-16 00:00:00.000,2014-09-26 00:00:00.000,2014-10-06 00:00:00.000,2014-10-16 00:00:00.000,2014-10-26 00:00:00.000,2014-11-05 00:00:00.000,2014-11-15 00:00:00.000,2014-11-25 00:00:00.000,2014-12-05 00:00:00.000,2014-12-15 00:00:00.000,2014-12-25 00:00:00.000,2015-01-04 00:00:00.000,2015-01-14 00:00:00.000,2015-01-24 00:00:00.000,2015-02-03 00:00:00.000,2015-02-13 00:00:00.000,2015-02-23 00:00:00.000,2015-03-05 00:00:00.000,2015-03-15 00:00:00.000,2015-03-25 00:00:00.000,2015-04-04 00:00:00.000,2015-04-14 00:00:00.000,2015-04-24 00:00:00.000,2015-05-04 00:00:00.000,2015-05-14 00:00:00.000,2015-05-24 00:00:00.000,2015-06-03 00:00:00.000,2015-06-13 00:00:00.000,2015-06-23 00:00:00.000,2012-12-15 00:00:00.000,2013-12-10 00:00:00.000,2015-03-15 00:00:00.000,2010-12-26 00:00:00.000,2011-12-21 00:00:00.000,2010-03-31 00:00:00.000,"199, 400","199, 800","199, 1200","199, 1800"
-OBS,0.0016968873,0.007549145,0.017537246,0.03158785,0.049602818,0.07146798,0.09703562,0.12614505,0.15861532,0.19425455,0.23281695,0.27404672,0.3176907,0.36344424,0.41098633,0.4600255,0.51025933,0.56143636,0.6133571,0.66553444,0.7178516,0.7704012,0.82269627,0.8746449,0.9261661,0.97700804,1.0266837,1.075046,1.1215502,1.1657692,1.2075442,1.2470088,1.283505,1.3167048,1.3460836,1.3711467,1.3915883,1.4073505,1.4176364,1.4222338,1.4235653,1.4251764,1.4272525,1.4300299,1.4334416,1.4376937,1.4429182,1.4488641,1.4547948,1.4603125,1.4656056,1.4704256,1.4741873,1.4752847,1.4738245,1.4694165,1.4611896,1.449487,1.4363856,1.4213961,1.4026655,1.3793243,1.3527155,1.3241467,1.2965815,1.2704608,1.2434195,1.2160033,1.1891444,1.1614685,1.1344153,1.1116309,1.0911471,1.0719005,1.0527072,1.0326412,1.0128752,0.99458045,0.9754697,0.95573056,0.9363317,0.9158328,0.89282525,0.8686986,0.8423309,0.81245947,0.77893275,0.7419268,0.7024904,0.6612976,0.6193502,0.5782304,0.53965735,0.5051061,0.47489527,0.45020473,0.43144864,0.4186316,0.41004148,0.40574685,0.4042486,0.39915204,0.38872367,0.37419528,0.35517636,0.33174545,0.30616295,0.28151485,0.2636555,0.24812838,0.23326682,0.2185264,0.2046949,0.19195016,0.17977433,0.16876085,0.15952761,0.15166986,0.14568953,0.14111458,0.1373079,0.1336918,0.13018894,0.12653682,0.12283045,0.119267896,0.11993221,0.12808073,0.1359953,0.14335634,0.1499063,0.15490334,0.15908614,0.16274403,0.16555065,0.16695149,0.1671911,0.16613625,0.164992,0.1643203,0.16512139,0.16901411,0.17592156,0.18565156,0.19735679,0.21057734,0.22475953,0.239172,0.25242954,0.26408574,0.27468532,0.28491238,0.29450402,0.30279353,0.30875587,0.31200513,0.31252342,0.30972025,0.3039142,0.29564658,0.2858532,0.27539688,0.2641619,0.25273055,0.24120258,0.2295282,0.21775572,0.2068884,0.1965159,0.18688032,0.17763661,0.16827875,0.1587631,0.14956273,0.14119677,0.13354658,0.12660715,0.120499015,0.115329266,0.11091871,0.106530644,0.10148542,0.09563612,0.0887933,0.08123062,0.07339937,0.06549388,0.057671394,0.050342962,0.04377567,0.037934422,0.032930486,0.028952241,0.025974156,0.023769772,0.022172002,0.021033743,0.020261472,0.019794177,0.019617574,0.3,0.2,0.015,0.7,0.5,0.1,0.0,0.1,0.2,0.0
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+4,0.02509654,0.028275475,0.03370005,0.041331254,0.0511149,0.062982604,0.07685298,0.09263297,0.11021917,0.12949924,0.15035124,0.17264456,0.21688063,0.26655793,0.31835392,0.37198913,0.42720312,0.48359475,0.5406858,0.5980349,0.6550778,0.71119344,0.76599175,0.81908506,0.87007874,0.9185891,0.9642108,1.0068879,1.0467757,1.0840752,1.1184549,1.1493537,1.1766772,1.2003511,1.220341,1.2367598,1.2497233,1.2590172,1.2645817,1.2663132,1.2647986,1.2609127,1.2547251,1.2461302,1.2350308,1.2211872,1.2045375,1.185195,1.163001,1.1378574,1.1104543,1.0816,1.0511289,1.019842,0.9876242,0.95497,0.923216,0.8924859,0.8628618,0.83473474,0.80830723,0.7841457,0.76289344,0.74458444,0.7288459,0.7142982,0.6996053,0.68460655,0.6691861,0.6542112,0.639658,0.6247348,0.6098152,0.5952073,0.58026916,0.5646029,0.5484599,0.53078854,0.51078904,0.48859674,0.46520126,0.441591,0.41829437,0.3958168,0.37400123,0.3536297,0.33617395,0.32118374,0.30964026,0.30152667,0.2962655,0.2928557,0.290957,0.28927323,0.287525,0.28604135,0.28523937,0.2941271,0.29974955,0.30188352,0.30280775,0.30590305,0.3110742,0.31811467,0.32674533,0.33662698,0.34737518,0.35857677,0.36980653,0.38064334,0.3907493,0.39983857,0.40756068,0.41360563,0.41771594,0.4196948,0.41941193,0.41680706,0.41188982,0.4047373,0.39652687,0.38884622,0.38171345,0.37512413,0.3690653,0.36351517,0.35844737,0.35383835,0.34966516,0.34590644,0.34253225,0.33951256,0.3368389,0.33450806,0.33252054,0.3308785,0.32958513,0.3286458,0.32806528,0.32784706,0.32724503,0.32518786,0.3217241,0.31694993,0.3109956,0.30402103,0.29620656,0.28774014,0.2788123,0.269609,0.26029444,0.2510134,0.24190937,0.23310415,0.22469568,0.21675612,0.20933285,0.20245112,0.19611491,0.1903093,0.18420985,0.17677793,0.16823912,0.158843,0.1488428,0.13848704,0.12801021,0.11762371,0.10751237,0.0978315,0.088704556,0.080223896,0.0724542,0.06543454,0.059183154,0.053702984,0.04898725,0.045024928,0.041805558,0.039323147,0.037376013,0.035673793,0.03421722,0.033006907,0.032039654,0.03130674,0.030794028,0.030483132,0.03035045,0.030367943,0.03050199,0.030718183,0.030987171,0.03128131,0.031575482,0.03184779,0.032080103,0.032258306,0.03237228,0.032415867,0.35857677,0.31694993,0.030367943,0.6498204,0.17971112,0.11021917,0.036091,0.194078,-0.082472,0.242714
diff --git a/tests/ert/unit_tests/data/test_integration_data.py b/tests/ert/unit_tests/data/test_integration_data.py
index ee84dabbf34..a95fb17b358 100644
--- a/tests/ert/unit_tests/data/test_integration_data.py
+++ b/tests/ert/unit_tests/data/test_integration_data.py
@@ -154,7 +154,9 @@ def test_all_measured_snapshot(snapshot, snake_oil_storage, create_measured_data
     experiment = next(snake_oil_storage.experiments)
     obs_keys = experiment.observation_keys
     measured_data = create_measured_data(obs_keys)
-    snapshot.assert_match(measured_data.data.to_csv(), "snake_oil_measured_output.csv")
+    snapshot.assert_match(
+        measured_data.data.round(10).to_csv(), "snake_oil_measured_output.csv"
+    )
 
 
 def test_that_measured_data_gives_error_on_missing_response(snake_oil_case_storage):
diff --git a/tests/ert/unit_tests/simulator/test_batch_sim.py b/tests/ert/unit_tests/simulator/test_batch_sim.py
index 461ae965547..a24b3be6d8f 100644
--- a/tests/ert/unit_tests/simulator/test_batch_sim.py
+++ b/tests/ert/unit_tests/simulator/test_batch_sim.py
@@ -49,21 +49,17 @@ def __init__(self, ert_config, storage, controls, results, callback=None):
         try:
             ens_config = ert_config.ensemble_config
             for control_name, variables in controls.items():
-                ens_config.addNode(
-                    ExtParamConfig(
-                        name=control_name,
-                        input_keys=variables,
-                        output_file=control_name + ".json",
-                    )
+                ens_config.parameter_configs[control_name] = ExtParamConfig(
+                    name=control_name,
+                    input_keys=variables,
+                    output_file=control_name + ".json",
                 )
 
             if "gen_data" not in ens_config:
-                ens_config.addNode(
-                    GenDataConfig(
-                        keys=results,
-                        input_files=[f"{k}" for k in results],
-                        report_steps_list=[None for _ in results],
-                    )
+                ens_config.response_configs["gen_data"] = GenDataConfig(
+                    keys=results,
+                    input_files=[f"{k}" for k in results],
+                    report_steps_list=[None for _ in results],
                 )
             else:
                 existing_gendata = ens_config.response_configs["gen_data"]
diff --git a/tests/ert/unit_tests/snapshots/test_libres_facade/test_misfit_collector/0/misfit_collector.csv b/tests/ert/unit_tests/snapshots/test_libres_facade/test_misfit_collector/0/misfit_collector.csv
index 1bff34c1de8..04935eac725 100644
--- a/tests/ert/unit_tests/snapshots/test_libres_facade/test_misfit_collector/0/misfit_collector.csv
+++ b/tests/ert/unit_tests/snapshots/test_libres_facade/test_misfit_collector/0/misfit_collector.csv
@@ -1,6 +1,6 @@
 Realization,MISFIT:FOPR,MISFIT:WOPR_OP1_108,MISFIT:WOPR_OP1_144,MISFIT:WOPR_OP1_190,MISFIT:WOPR_OP1_36,MISFIT:WOPR_OP1_72,MISFIT:WOPR_OP1_9,MISFIT:WPR_DIFF_1,MISFIT:TOTAL
 0,1572.4551,4.6631575,1.2280039,24.150873,0.16579537,16.603199,0.5786172,17.52338,1637.3682
-1,564.73254,4.3687825,32.65306,2.25,7.5132375,7.502955,4.0,3.917212,626.9378
-2,760.21344,0.67585987,0.04954808,0.8789783,0.53148407,10.315068,0.56918764,21.326956,794.56055
-3,762.2886,0.057372905,2.0035706,89.3921,1.0729967,0.2363393,1.9635296,4.454344,861.46875
-4,978.6854,0.60999763,11.165132,2.3617368,0.51387596,41.033993,0.04177265,27.461798,1061.8737
+1,564.73254,4.3687825,32.65306,2.25,7.513238,7.502955,4.0,3.9172122,626.9378
+2,760.21344,0.67585987,0.04954808,0.8789783,0.53148407,10.315068,0.56918764,21.326956,794.5605
+3,762.2885,0.0573729,2.0035706,89.3921,1.0729967,0.2363393,1.9635296,4.454344,861.46875
+4,978.6855,0.60999763,11.165132,2.3617368,0.51387596,41.033993,0.04177265,27.461798,1061.8737
diff --git a/tests/ert/unit_tests/storage/snapshots/test_storage_migration/test_that_storage_matches/parameters b/tests/ert/unit_tests/storage/snapshots/test_storage_migration/test_that_storage_matches/parameters
index 11c37522e80..74f07f09cf8 100644
--- a/tests/ert/unit_tests/storage/snapshots/test_storage_migration/test_that_storage_matches/parameters
+++ b/tests/ert/unit_tests/storage/snapshots/test_storage_migration/test_that_storage_matches/parameters
@@ -1 +1 @@
-{'BPR': GenKwConfig(name='BPR', forward_init=False, update=True, template_file='/home/eivind/Projects/ert/test-data/all_data_types/template.txt', output_file='params.txt', transform_function_definitions=[{'name': 'BPR', 'param_name': 'NORMAL', 'values': ['0', '1']}], forward_init_file=None), 'PORO': Field(name='PORO', forward_init=False, update=True, nx=2, ny=3, nz=4, file_format='grdecl', output_transformation=None, input_transformation=None, truncation_min=None, truncation_max=None, forward_init_file='data/poro%d.grdecl', output_file='poro.grdecl', grid_file='/home/eivind/Projects/ert/test-data/all_data_types/refcase/CASE.EGRID', mask_file=''), 'TOP': SurfaceConfig(name='TOP', forward_init=False, update=True, ncol=2, nrow=3, xori=0.0, yori=0.0, xinc=1.0, yinc=1.0, rotation=0.0, yflip=1, forward_init_file='data/surf%d.irap', output_file='surf.irap', base_surface_path='data/basesurf.irap')}
+{'BPR': GenKwConfig(name='BPR', forward_init=False, update=True, template_file='/home/eivind/Projects/ert/test-data/all_data_types/template.txt', output_file='params.txt', transform_function_definitions=[{'name': 'BPR', 'param_name': 'NORMAL', 'values': ['0', '1']}], forward_init_file=None), 'PORO': Field(name='PORO', forward_init=False, update=True, nx=2, ny=3, nz=4, file_format=<FieldFileFormat.GRDECL: 'grdecl'>, output_transformation=None, input_transformation=None, truncation_min=None, truncation_max=None, forward_init_file='data/poro%d.grdecl', output_file=PosixPath('poro.grdecl'), grid_file='/home/eivind/Projects/ert/test-data/all_data_types/refcase/CASE.EGRID', mask_file=''), 'TOP': SurfaceConfig(name='TOP', forward_init=False, update=True, ncol=2, nrow=3, xori=0.0, yori=0.0, xinc=1.0, yinc=1.0, rotation=0.0, yflip=1, forward_init_file='data/surf%d.irap', output_file='surf.irap', base_surface_path='data/basesurf.irap')}
diff --git a/tests/ert/unit_tests/test_libres_facade.py b/tests/ert/unit_tests/test_libres_facade.py
index 3cc2787777a..bcc3efa098a 100644
--- a/tests/ert/unit_tests/test_libres_facade.py
+++ b/tests/ert/unit_tests/test_libres_facade.py
@@ -139,7 +139,7 @@ def test_summary_collector(
 def test_misfit_collector(snake_oil_case_storage, snake_oil_default_storage, snapshot):
     facade = LibresFacade(snake_oil_case_storage)
     data = facade.load_all_misfit_data(snake_oil_default_storage)
-    snapshot.assert_match(data.to_csv(), "misfit_collector.csv")
+    snapshot.assert_match(data.round(8).to_csv(), "misfit_collector.csv")
 
     with pytest.raises(KeyError):
         # realization 60: