diff --git a/.github/workflows/sphinx.yml b/.github/workflows/sphinx.yml
index 8cabeeaa..6c5360b8 100644
--- a/.github/workflows/sphinx.yml
+++ b/.github/workflows/sphinx.yml
@@ -15,7 +15,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v4
+      - name: Set up Python 3.11
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.11.6
 
       - name: Build docs requirements
         run: pip install -r docs/requirements.txt
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 79875ddb..0a305ba3 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,4 +1,6 @@
-pallets_sphinx_themes==2.*
-myst-parser==2.0.*
-autodoc_pydantic==1.9.0
-pydantic>=2.4.0 # not directly required, pinned by Snyk to avoid a vulnerability
+sphinx==7.2.6
+pallets_sphinx_themes==2.1.1
+myst-parser==2.0.0
+autodoc_pydantic==2.0.1
+pydantic==2.4.2
+pydantic-settings==2.0.3