diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index cbfc01c6..92cf9744 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -23,6 +23,6 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install requirements
-        run: pip install -r requirements_frozen.txt
+        run: pip install -c constraints.txt -r requirements_frozen.txt
       - name: Run tests
         run: pytest
diff --git a/constraints.txt b/constraints.txt
new file mode 100644
index 00000000..9428e642
--- /dev/null
+++ b/constraints.txt
@@ -0,0 +1 @@
+importlib-metadata<5.0