diff --git a/test/cli/test-fixtures/image-hidden-packages/Dockerfile b/test/cli/test-fixtures/image-hidden-packages/Dockerfile
index cf8ea3b..4fadf5d 100644
--- a/test/cli/test-fixtures/image-hidden-packages/Dockerfile
+++ b/test/cli/test-fixtures/image-hidden-packages/Dockerfile
@@ -1,4 +1,4 @@
-FROM centos:7.9.2009
+FROM centos:7.9.2009@sha256:c73f515d06b0fa07bb18d8202035e739a494ce760aa73129f60f4bf2bd22b407
 # all-layers scope should pickup on vsftpd
 RUN yum install -y vsftpd
 RUN yum remove -y vsftpd
\ No newline at end of file