diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index ba324a7..3a81721 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -20,7 +20,7 @@ jobs:
       - name: Python install
         run: |
           python -m pip install --upgrade pip
-          python -m pip install "lander<2.0.0"
+          python -m pip install -r requirements.txt
 
       - name: TeX build
         run: |
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..2350c0a
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,3 @@
+pydantic<2.0.0
+lander<2.0.0
+