diff --git a/.github/workflows/gh-ci.yaml b/.github/workflows/gh-ci.yaml
index 31c5fb4..0340ee6 100644
--- a/.github/workflows/gh-ci.yaml
+++ b/.github/workflows/gh-ci.yaml
@@ -89,7 +89,7 @@ jobs:
     - name: Install package
       run: |
         python --version
-        mamba install -c conda-forge openbabel
+        mamba install -c conda-forge openbabel==2.4.0
         python -m pip install .  --no-deps 
 
     - name: Python information