diff --git a/test/_ubuntu_18.Dockerfile b/test/_ubuntu_18.Dockerfile
index 592c5c3f..dd02a67e 100644
--- a/test/_ubuntu_18.Dockerfile
+++ b/test/_ubuntu_18.Dockerfile
@@ -1,4 +1,4 @@
-FROM buildpack-deps:bionic-scm
+FROM buildpack-deps:impish-scm
 
 ENV GITDIR /etc/.pihole
 ENV SCRIPTDIR /opt/pihole