diff --git a/test/_ubuntu_20.Dockerfile b/test/_ubuntu_20.Dockerfile
index 80e2e007..6d4d7fbc 100644
--- a/test/_ubuntu_20.Dockerfile
+++ b/test/_ubuntu_20.Dockerfile
@@ -1,4 +1,4 @@
-FROM buildpack-deps:focal-scm
+FROM buildpack-deps:impish-scm
 
 ENV GITDIR /etc/.pihole
 ENV SCRIPTDIR /opt/pihole