diff --git a/.github/workflows/CI-unixish.yml b/.github/workflows/CI-unixish.yml
index 41e10462a..764347a66 100644
--- a/.github/workflows/CI-unixish.yml
+++ b/.github/workflows/CI-unixish.yml
@@ -43,6 +43,7 @@ jobs:
         uses: jurplel/install-qt-action@v2
         with:
           modules: 'qtcharts'
+          mirror: 'http://mirrors.ocf.berkeley.edu/qt/'
 
       - name: Test CMake build
         run: |
diff --git a/.github/workflows/CI-windows.yml b/.github/workflows/CI-windows.yml
index 6b030b8ad..90801752f 100644
--- a/.github/workflows/CI-windows.yml
+++ b/.github/workflows/CI-windows.yml
@@ -57,6 +57,7 @@ jobs:
         uses: jurplel/install-qt-action@v2
         with:
           modules: 'qtcharts'
+          mirror: 'http://mirrors.ocf.berkeley.edu/qt/'
 
       - name: Build GUI x64 release
         run: |
diff --git a/.github/workflows/release-windows.yml b/.github/workflows/release-windows.yml
index 95bf7c319..0f81ca9f9 100644
--- a/.github/workflows/release-windows.yml
+++ b/.github/workflows/release-windows.yml
@@ -53,6 +53,7 @@ jobs:
         with:
           version: '5.15.2'
           modules: 'qtcharts qthelp'
+          mirror: 'http://mirrors.ocf.berkeley.edu/qt/'
 
       - name: Create .qm
         run: |