diff --git a/dockerfiles/alpine.Dockerfile b/dockerfiles/alpine.Dockerfile
index ebc5af3..7a8c074 100644
--- a/dockerfiles/alpine.Dockerfile
+++ b/dockerfiles/alpine.Dockerfile
@@ -14,10 +14,12 @@ RUN <<EOT
   apk update -q
   apk add bash jemalloc
   rm -rf /var/cache/apk
-  gem update --system --no-document
-  gem install -N bundler
 EOT
 
+RUN \
+  --mount=type=cache,id=usr-local-bundle-cache,target=${BUNDLE_PATH},sharing=locked \
+  gem update --system --no-document; \
+  gem install -N bundler
 
 FROM base AS build
 
diff --git a/dockerfiles/bookworm.Dockerfile b/dockerfiles/bookworm.Dockerfile
index 1d616da..b0252d3 100644
--- a/dockerfiles/bookworm.Dockerfile
+++ b/dockerfiles/bookworm.Dockerfile
@@ -20,11 +20,10 @@ RUN \
   apt-get install --yes --no-install-recommends \
   libjemalloc2
 
-RUN <<EOT
-  gem update --system --no-document
+RUN \
+  --mount=type=cache,id=usr-local-bundle-cache,target=${BUNDLE_PATH},sharing=locked \
+  gem update --system --no-document; \
   gem install -N bundler
-EOT
-
 
 ENV DEBIAN_FRONTEND="noninteractive"