diff --git a/images/ubuntu/Containerfile b/images/ubuntu/Containerfile
index 9d08ea0..4703d0d 100644
--- a/images/ubuntu/Containerfile
+++ b/images/ubuntu/Containerfile
@@ -27,7 +27,7 @@ USER linuxbrew
 ENV NONINTERACTIVE=1
 RUN curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh | bash
 RUN eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)" && \
-    brew install git && \
+    brew install git ruby && \
     sudo apt-get remove --purge --assume-yes git && \
     sudo apt-get autoremove --purge --assume-yes