diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 95a7430b..99569578 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -49,6 +49,7 @@ jobs:
           chmod +x test/roadies_env_test.sh
           ./test/roadies_env_test.sh
           pip3 install ete3 six numpy
+          pip install PyYAML
           python run_roadies.py --cores 32 --config test/test_config.yaml --mode accurate
 
       - name: Install dependencies for mkdocs