diff --git a/.travis.yml b/.travis.yml
index 551c038..c900606 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,8 +8,6 @@ python:
 
 env:
   matrix:
-    - DJANGO=2.0
-    - DJANGO=2.1
     - DJANGO=2.2
     - DJANGO=master
 
diff --git a/data_schema/convert_value.py b/data_schema/convert_value.py
index ca39bc6..a5cdd21 100644
--- a/data_schema/convert_value.py
+++ b/data_schema/convert_value.py
@@ -10,6 +10,7 @@
 import pytz
 
 from data_schema.field_schema_type import FieldSchemaType, FieldSchemaCase
+from data_schema.exceptions import InvalidDateFormatException
 
 
 class ValueConverter(object):
@@ -154,6 +155,11 @@ def _convert_value(self, value, format_str):
         if self.is_string(value):
             value = datetime.strptime(value, format_str) if format_str else parse(value)
 
+        # It is assumed that value is a datetime here. If it isn't a datetime, then it is a bad value like
+        # a number that is too large to be parsed as an integer
+        if type(value) != datetime:
+            raise InvalidDateFormatException(f'Invalid date format: {value}')
+
         # Convert any aware datetime objects to naive utc
         return value if value.tzinfo is None else fleming.convert_to_tz(value, pytz.utc, return_naive=True)
 
diff --git a/data_schema/docs/release_notes.rst b/data_schema/docs/release_notes.rst
index c75f351..cc0f849 100644
--- a/data_schema/docs/release_notes.rst
+++ b/data_schema/docs/release_notes.rst
@@ -1,5 +1,11 @@
 Release Notes
-=============
+
+
+v1.4.0
+------
+* Raise InvalidDateFormatException when trying to parse a timestamp that is too large.
+* remove django 2.0
+* remove django 2.1
 
 v1.3.0
 ------
diff --git a/data_schema/exceptions.py b/data_schema/exceptions.py
new file mode 100644
index 0000000..fa7eccb
--- /dev/null
+++ b/data_schema/exceptions.py
@@ -0,0 +1,4 @@
+
+
+class InvalidDateFormatException(Exception):
+    pass
diff --git a/data_schema/tests/convert_value_tests.py b/data_schema/tests/convert_value_tests.py
index 42f9cb9..9442625 100644
--- a/data_schema/tests/convert_value_tests.py
+++ b/data_schema/tests/convert_value_tests.py
@@ -4,6 +4,7 @@
 
 from data_schema.models import FieldSchemaType
 from data_schema.convert_value import convert_value
+from data_schema.exceptions import InvalidDateFormatException
 
 
 class ConvertValueExceptionTest(SimpleTestCase):
@@ -122,3 +123,12 @@ def test_convert(self):
         self.assertEqual(datetime(2017, 3, 1, 0), convert_value(FieldSchemaType.DATE_FLOORED, '2017-03-01T10:30.000Z'))
         self.assertEqual(datetime(2017, 3, 1, 0), convert_value(FieldSchemaType.DATE_FLOORED, '2017-03-01 10:30.00'))
         self.assertEqual(datetime(2017, 3, 1, 0), convert_value(FieldSchemaType.DATE_FLOORED, '2017-03-01'))
+
+    def test_convert_too_large_integer(self):
+        """
+        Verifies that InvalidDateFormatException is raised instead of a generic attribute error
+        """
+        with self.assertRaises(InvalidDateFormatException) as context:
+            convert_value(FieldSchemaType.DATE_FLOORED, 3333333333333333333333333)
+
+        self.assertEqual(str(context.exception), 'Invalid date format: 3333333333333333333333333')
diff --git a/data_schema/version.py b/data_schema/version.py
index 19b4f1d..96e3ce8 100644
--- a/data_schema/version.py
+++ b/data_schema/version.py
@@ -1 +1 @@
-__version__ = '1.3.0'
+__version__ = '1.4.0'
diff --git a/requirements/requirements-testing.txt b/requirements/requirements-testing.txt
index d9a3e3b..48603f6 100644
--- a/requirements/requirements-testing.txt
+++ b/requirements/requirements-testing.txt
@@ -1,6 +1,6 @@
-coverage
-coveralls
-django-dynamic-fixture
-django-nose
-mock
-psycopg2
+coverage<=5.5
+coveralls<=3.0.1
+django-dynamic-fixture<=3.1.1
+django-nose<=1.4.7
+mock<=4.0.3
+psycopg2<=2.8.6
diff --git a/setup.py b/setup.py
index b8d5363..07f1668 100644
--- a/setup.py
+++ b/setup.py
@@ -36,18 +36,17 @@ def get_version():
         'License :: OSI Approved :: BSD License',
         'Operating System :: OS Independent',
         'Framework :: Django',
-        'Framework :: Django :: 2.0',
-        'Framework :: Django :: 2.1',
         'Framework :: Django :: 2.2',
     ],
     license='MIT',
     install_requires=[
-        'Django>=2.0',
+        'Django<4.0',
         'django-manager-utils>=1.4.0',
         'fleming>=0.5.0',
         'python-dateutil>=2.2',
     ],
     tests_require=[
+        'Django<4.0',
         'django-dynamic-fixture',
         'psycopg2',
         'django-nose',
diff --git a/tox.ini b/tox.ini
index f30ec9a..c5d578e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,8 +1,6 @@
 [tox]
 envlist =
     flake8
-    py{36}-django20
-    py{36,37}-django21
     py{36,37}-django22
     py{36,37}-djangomaster
 
@@ -10,9 +8,7 @@ envlist =
 setenv =
     DB = postgres
 deps =
-    django20: Django>=2.0,<2.1
-    django21: Django>=2.1,<2.2
-    django22: Django>=2.2,<2.3
+    django22: Django>=2.2,<3.0
     djangomaster: https://github.com/django/django/archive/master.tar.gz
     -rrequirements/requirements-testing.txt
 commands =
@@ -25,7 +21,5 @@ commands = flake8 data_schema
 
 [travis:env]
 DJANGO =
-    2.0: django20
-    2.1: django21
     2.2: django22
     master: djangomaster