diff --git a/dockerfiles/alpine.Dockerfile b/dockerfiles/alpine.Dockerfile
index dcafd8a..c900e95 100644
--- a/dockerfiles/alpine.Dockerfile
+++ b/dockerfiles/alpine.Dockerfile
@@ -23,7 +23,7 @@ RUN <<EOT
   rm -rf /var/cache/apk
 EOT
 
-COPY Gemfile* .
+COPY Gemfile Gemfile.lock ./
 
 RUN <<EOT
   bundle install
diff --git a/dockerfiles/bookworm.Dockerfile b/dockerfiles/bookworm.Dockerfile
index 264c337..dea5593 100644
--- a/dockerfiles/bookworm.Dockerfile
+++ b/dockerfiles/bookworm.Dockerfile
@@ -23,7 +23,7 @@ RUN <<EOT
   rm -rf /var/lib/apt/lists /var/cache/apt/archives
 EOT
 
-COPY Gemfile* .
+COPY Gemfile Gemfile.lock ./
 
 RUN <<EOT
   bundle install