diff --git a/ruby-bookworm/Dockerfile b/ruby-bookworm/Dockerfile
index 9c40652..dbd9d1d 100644
--- a/ruby-bookworm/Dockerfile
+++ b/ruby-bookworm/Dockerfile
@@ -3,4 +3,5 @@ FROM node:20-bookworm@sha256:48db4f6ea21d134be744207225753a1730c4bc1b4cdf836d445
 RUN apt-get update && \
     apt-get install git -y && \
     apt-get install ruby-full -y && \
+    gem install bundler && \
     rm -rf /var/lib/apt/lists/*