diff --git a/dockerfiles/idp_deploy.Dockerfile b/dockerfiles/idp_deploy.Dockerfile
index 9b525d3433c..0c8f56db320 100644
--- a/dockerfiles/idp_deploy.Dockerfile
+++ b/dockerfiles/idp_deploy.Dockerfile
@@ -6,7 +6,7 @@
 # avoid having build-essential and the large-files token be in the
 # main image.
 #########################################################################
-FROM ruby:3.3.4-slim as builder
+FROM public.ecr.aws/docker/library/ruby:3.3.4-slim as builder
 
 # Set environment variables
 ENV RAILS_ROOT /app
@@ -140,7 +140,7 @@ RUN openssl req -x509 -sha256 -nodes -newkey rsa:2048 -days 1825 \
 #########################################################################
 # This is the main image.
 #########################################################################
-FROM ruby:3.3.4-slim as main
+FROM public.ecr.aws/docker/library/ruby:3.3.4-slim as main
 
 # Set environment variables
 ENV RAILS_ROOT /app