diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index 9ca4cf5..98c2ee0 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -65,7 +65,7 @@ jobs:
         uses: actions/cache@v3
         with:
           path: .venv
-          key: venv-${{ runner.os }}-${{ hashFiles('**/poetry.lock') }}
+          key: venv-${{ runner.os }}-${{ hashFiles('**/poetry.lock') }}-${{ matrix.python-version }}
 
       #----------------------------------------------
       # install dependencies if cache does not exist