diff --git a/.github/workflows/dockerimage.yml b/.github/workflows/dockerimage.yml
index 1e8eb4a3..3ad744eb 100644
--- a/.github/workflows/dockerimage.yml
+++ b/.github/workflows/dockerimage.yml
@@ -19,7 +19,8 @@ jobs:
         MKCERT_VERSION: v1.4.3
       run: |
         set -x
-        sudo apt-get install -y libnss3-tools
+        sudo apt-get update && \
+          sudo apt-get install -y libnss3-tools
 
         curl https://github.com/FiloSottile/mkcert/releases/download/${MKCERT_VERSION}/mkcert-${MKCERT_VERSION}-linux-amd64 --location --output /tmp/mkcert
         chmod 744 /tmp/mkcert