diff --git a/.github/workflows/runTests.yml b/.github/workflows/runTests.yml
index f04d5926..18c56e8a 100644
--- a/.github/workflows/runTests.yml
+++ b/.github/workflows/runTests.yml
@@ -21,7 +21,9 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4      
+        with:
+          submodules: true
       - name: Set up Python version ${{ matrix.version }}
         uses: actions/setup-python@v4
         with:
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..49c4fbff
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "cpp/RAT"]
+	path = cpp/RAT
+	url = https://github.com/RascalSoftware/RAT/tree/generated_source
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index a4483ce6..87d71142 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -9,7 +9,7 @@ This project targets Python 3.9 or later. Install an appropriate version of Pyth
 
 Then create a fork of the python-RAT repo, and clone the fork
 
-    git clone https://github.com/<username>/python-RAT.git
+    git clone --recurse-submodules https://github.com/<username>/python-RAT.git
     cd python-RAT
 
 And finally create a separate branch to begin work
diff --git a/requirements.txt b/requirements.txt
index d8702c34..111b39f4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 numpy >= 1.20
 prettytable >= 3.9.0
-pydantic >= 2.4.0
+pydantic >= 2.4.2
 pytest >= 7.4.0
 pytest-cov >= 4.1.0
 StrEnum >= 0.4.15
\ No newline at end of file
diff --git a/tests/test_models.py b/tests/test_models.py
index a057f58a..83b01ecd 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -49,23 +49,23 @@ def test_default_names(model: Callable, model_name: str) -> None:
 class TestModels(object):
     def test_initialise_with_wrong_type(self, model: Callable) -> None:
         """When initialising a model with the wrong type for the "name" field, we should raise a ValidationError."""
-        with pytest.raises(pydantic.ValidationError, match='Input should be a valid string'):
+        with pytest.raises(pydantic.ValidationError, match=f'1 validation error for {model.__name__}\nname\n  Input should be a valid string'):
             model(name=1)
 
     def test_assignment_with_wrong_type(self, model: Callable) -> None:
         """When assigning the "name" field of a model with the wrong type, we should raise a ValidationError."""
         test_model = model()
-        with pytest.raises(pydantic.ValidationError, match='Input should be a valid string'):
+        with pytest.raises(pydantic.ValidationError, match=f'1 validation error for {model.__name__}\nname\n  Input should be a valid string'):
             test_model.name = 1
 
     def test_initialise_with_zero_length_name(self, model: Callable) -> None:
         """When initialising a model with a zero length name, we should raise a ValidationError."""
-        with pytest.raises(pydantic.ValidationError, match='String should have at least 1 characters'):
+        with pytest.raises(pydantic.ValidationError, match=f'1 validation error for {model.__name__}\nname\n  String should have at least 1 character'):
             model(name='')
 
     def test_initialise_with_extra_fields(self, model: Callable) -> None:
         """When initialising a model with unspecified fields, we should raise a ValidationError."""
-        with pytest.raises(pydantic.ValidationError, match='Extra inputs are not permitted'):
+        with pytest.raises(pydantic.ValidationError, match=f'1 validation error for {model.__name__}\nnew_field\n  Extra inputs are not permitted'):
             model(new_field=1)