diff --git a/.github/workflows/ci-py-only.yml b/.github/workflows/ci-py-only.yml
index d8d4b808d3..b8c1e031fd 100644
--- a/.github/workflows/ci-py-only.yml
+++ b/.github/workflows/ci-py-only.yml
@@ -87,6 +87,7 @@ jobs:
           sudo /usr/bin/python -m pip install lark
           sudo /usr/bin/python -m pip install networkx
           sudo /usr/bin/python -m pip install tabulate
+          sudo /usr/bin/python -m pip install dateutil
 
       - name: Test
         run: |