diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index ecb168c..776f6ab 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -39,7 +39,7 @@ jobs:
 
     - name: Install kerb5-config
       if: matrix.os == 'ubuntu-20.04'
-      run: sudo apt-get install libkrb5-dev
+      run: sudo apt-get update && sudo apt-get install libkrb5-dev
 
     - name: install
       run: |