diff --git a/content/guides/ruby/containerize.md b/content/guides/ruby/containerize.md
index 83f0c3933e..ed87769c05 100644
--- a/content/guides/ruby/containerize.md
+++ b/content/guides/ruby/containerize.md
@@ -67,7 +67,7 @@ FROM base AS build
 
 # Install packages needed to build gems
 RUN apt-get update -qq && \
-    apt-get install --no-install-recommends -y build-essential curl git pkg-config && \
+    apt-get install --no-install-recommends -y build-essential curl git pkg-config libyaml-dev && \
     rm -rf /var/lib/apt/lists /var/cache/apt/archives
 
 # Install JavaScript dependencies and Node.js for asset compilation