diff --git a/pyproject.toml b/pyproject.toml
index dc1dd04..640a724 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,7 @@ urls = {Homepage = "https://aiida-testing.readthedocs.io/"}
 requires-python = ">=3.7"
 # Note the dependency on setuptools due to pkg_resources
 dependencies = [
-    "aiida-core>=1.0.0,<2.3",
+    "aiida-core>=1.0.0,<2.6",
     "pytest>=7.0",
     "voluptuous~=0.12",
     "setuptools",