diff --git a/Dockerfile b/Dockerfile
index b9689b2..b33e226 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-ARG BASE_IMAGE=senzing/senzingapi-runtime:3.12.8
+ARG BASE_IMAGE=senzing/senzingapi-runtime:3.12.8@sha256:3663a1971e564af4d12ecdb0c90a4f46418b77dc229ec6c9f692efc59d1c67ae
 FROM ${BASE_IMAGE}
 
 ENV REFRESHED_AT=2022-12-21