diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index b874e942..82af3514 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -36,7 +36,7 @@ jobs:
       uses: actions/cache@v3
       with:
         path: .venv
-        key: venv-${{ runner.os }}-${{ matrix.python-version }}-${{ hashFiles('**/poetry.lock') }}
+        key: venv-${{ runner.os }}-${{ matrix.python-version }}-${{ hashFiles('pyproject.toml') }}
     #----------------------------------------------
     # install dependencies if cache does not exist
     #----------------------------------------------
@@ -78,7 +78,7 @@ jobs:
       uses: actions/cache@v3
       with:
         path: .venv
-        key: venv-${{ runner.os }}-${{ matrix.python-version }}-${{ hashFiles('**/poetry.lock') }}
+        key: venv-${{ runner.os }}-${{ matrix.python-version }}-${{ hashFiles('pyproject.toml') }}
     #----------------------------------------------
     # install dependencies if cache does not exist
     #----------------------------------------------