diff --git a/Dockerfile.base b/Dockerfile.base
index ffcdd2f2be..1d2091f2a4 100644
--- a/Dockerfile.base
+++ b/Dockerfile.base
@@ -5,7 +5,7 @@
 # The standard name for this image is ovn-kubernetes-base
 
 # build base image shared by both OpenShift and MicroShift
-FROM registry.ci.openshift.org/ocp/4.20:base-rhel9
+FROM registry.ci.openshift.org/ocp/4.18:base-rhel9
 
 # install selinux-policy first to avoid a race
 RUN dnf --setopt=retries=2 --setopt=timeout=2 install -y --nodocs \