diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 3d82e2a..1a83c06 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -54,7 +54,9 @@ jobs:
           pip install --no-binary pykdtree pykdtree>=1.3.13
       - name: Install OSMesa for Linux
         if: matrix.config.os == 'ubuntu-latest'
-        run: sudo apt-get install -y libosmesa6-dev
+        run: |
+          sudo apt update
+          sudo apt-get install -y libosmesa6-dev
 
       - name: Install and Run Tests (without viewer)
         if: matrix.config.os == 'windows-latest'
diff --git a/.github/workflows/test_and_release.yml b/.github/workflows/test_and_release.yml
index f9cf310..ac56f1e 100644
--- a/.github/workflows/test_and_release.yml
+++ b/.github/workflows/test_and_release.yml
@@ -55,7 +55,9 @@ jobs:
 
       - name: Install OSMesa for Linux
         if: matrix.config.os == 'ubuntu-latest'
-        run: sudo apt-get install -y libosmesa6-dev
+        run: |
+          sudo apt update
+          sudo apt-get install -y libosmesa6-dev
 
       - name: Install and Run Tests
         run: |