diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index f20801dd2..556d49181 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -35,7 +35,9 @@ jobs:
           mklink libglapi.dll "x64\libglapi.dll"
       - name: Install GR dependencies (Linux only)
         if: runner.os == 'Linux'
-        run: sudo apt install libxt6 libxrender1 libxext6 libgl1-mesa-glx libqt5widgets5
+        run: |
+          sudo apt-get update
+          sudo apt install libxt6 libxrender1 libxext6 libgl1-mesa-glx libqt5widgets5
       - uses: actions/cache@v2
         env:
           cache-name: cache-artifacts