diff --git a/test/_ubuntu_21.Dockerfile b/test/_ubuntu_21.Dockerfile
index afddbfa9..6d4d7fbc 100644
--- a/test/_ubuntu_21.Dockerfile
+++ b/test/_ubuntu_21.Dockerfile
@@ -1,4 +1,4 @@
-FROM buildpack-deps:hirsute-scm
+FROM buildpack-deps:impish-scm
 
 ENV GITDIR /etc/.pihole
 ENV SCRIPTDIR /opt/pihole