diff --git a/.github/workflows/sphinx_build_deploy.yml b/.github/workflows/sphinx_build_deploy.yml
index 7c73330..502561a 100644
--- a/.github/workflows/sphinx_build_deploy.yml
+++ b/.github/workflows/sphinx_build_deploy.yml
@@ -30,7 +30,7 @@ jobs:
         uses: actions/cache@v1
         with:
           path: ${{ steps.pip-cache.outputs.dir }}
-          key: ${{ runner.os }}-pip-${{ hashFiles{'**/docs/requirements.txt') }}
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/docs/requirements.txt') }}
           restore-keys: |
             ${{ runner.os }}-pip-