diff --git a/dockerfiles/alpine.Dockerfile b/dockerfiles/alpine.Dockerfile
index b033cb0..95bc176 100644
--- a/dockerfiles/alpine.Dockerfile
+++ b/dockerfiles/alpine.Dockerfile
@@ -12,6 +12,9 @@ EOT
 
 FROM base AS build
 
+ENV BUNDLE_DEPLOYMENT=true \
+  BUNDLE_WITHOUT="development test"
+
 RUN <<EOT
   apk add musl-dev gcc make
 EOT
@@ -19,7 +22,6 @@ EOT
 COPY Gemfile* .
 
 RUN <<EOT
-  bundle config set --local without development
   bundle install
 EOT
 
diff --git a/dockerfiles/bookworm.Dockerfile b/dockerfiles/bookworm.Dockerfile
index 3c21618..da64752 100644
--- a/dockerfiles/bookworm.Dockerfile
+++ b/dockerfiles/bookworm.Dockerfile
@@ -12,6 +12,9 @@ EOT
 
 FROM base AS build
 
+ENV BUNDLE_DEPLOYMENT=true \
+  BUNDLE_WITHOUT="development test"
+
 RUN <<EOT
   apt-get install --yes gcc make
 EOT
@@ -19,7 +22,6 @@ EOT
 COPY Gemfile* .
 
 RUN <<EOT
-  bundle config set --local without development
   bundle install
 EOT