diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index fa3374843..12c969e36 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -29,7 +29,7 @@ jobs:
         uses: actions/cache@v2
         with:
           path: ../Qt
-          key: ${{ runner.os }}-QtCache-v5
+          key: ${{ runner.os }}-QtCache-20201005
 
       # LINUX
       - name: Install p7zip (Ubuntu)
@@ -39,7 +39,7 @@ jobs:
       - name: Install Qt
         uses: jurplel/install-qt-action@v2
         with:
-          mirror: 'http://mirrors.ocf.berkeley.edu/qt/'
+          # mirror: 'http://mirrors.ocf.berkeley.edu/qt/'
           cached: ${{ steps.cache-qt.outputs.cache-hit }}
           extra: --external 7z