diff --git a/Dockerfile b/Dockerfile
index d984ccb..80f50e2 100755
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,8 +2,8 @@
 # Stages
 # -----------------------------------------------------------------------------
 
-ARG IMAGE_BUILDER=golang:1.24.4-bookworm
-ARG IMAGE_FINAL=senzing/senzingsdk-runtime:4.0.0
+ARG IMAGE_BUILDER=golang:1.24.4-bookworm@sha256:10f549dc8489597aa7ed2b62008199bb96717f52a8e8434ea035d5b44368f8a6
+ARG IMAGE_FINAL=senzing/senzingsdk-runtime:4.0.0@sha256:332d2ff9f00091a6d57b5b469cc60fd7dc9d0265e83d0e8c9e5296541d32a4aa
 
 # -----------------------------------------------------------------------------
 # Stage: senzingsdk_runtime
diff --git a/package.Dockerfile b/package.Dockerfile
index 3e13a9a..db279fa 100755
--- a/package.Dockerfile
+++ b/package.Dockerfile
@@ -2,10 +2,10 @@
 # Stages
 # -----------------------------------------------------------------------------
 
-ARG IMAGE_SENZINGSDK_RUNTIME=senzing/senzingsdk-runtime:4.0.0
-ARG IMAGE_BUILDER=golang:1.24.4-bookworm
-ARG IMAGE_FPM=dockter/fpm:1.1.0
-ARG IMAGE_FINAL=alpine
+ARG IMAGE_SENZINGSDK_RUNTIME=senzing/senzingsdk-runtime:4.0.0@sha256:332d2ff9f00091a6d57b5b469cc60fd7dc9d0265e83d0e8c9e5296541d32a4aa
+ARG IMAGE_BUILDER=golang:1.24.4-bookworm@sha256:10f549dc8489597aa7ed2b62008199bb96717f52a8e8434ea035d5b44368f8a6
+ARG IMAGE_FPM=dockter/fpm:1.1.0@sha256:a92ac598d35f1a7a4a659e26bd0e1bd25f317aafdcd4be8bf2795314c421d89b
+ARG IMAGE_FINAL=alpine@sha256:4bcff63911fcb4448bd4fdacec207030997caf25e9bea4045fa6c8c44de311d1
 
 # -----------------------------------------------------------------------------
 # Stage: senzingsdk_runtime