diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index f2faca6..6b5cb7e 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -27,6 +27,7 @@ jobs:
           set -xe
           pip install --upgrade pip setuptools wheel
           pip install -r requirements.txt
+          pip install -r requirements_dev.txt
         shell: bash
       - name: Build
         run: |