diff --git a/ruby/hello-img/{{cookiecutter.project_name}}/hello_world/Dockerfile b/ruby/hello-img/{{cookiecutter.project_name}}/hello_world/Dockerfile
index 95b92568..60fab952 100644
--- a/ruby/hello-img/{{cookiecutter.project_name}}/hello_world/Dockerfile
+++ b/ruby/hello-img/{{cookiecutter.project_name}}/hello_world/Dockerfile
@@ -3,7 +3,12 @@ FROM public.ecr.aws/lambda/ruby:{{ cookiecutter.options[cookiecutter.runtime].ve
 COPY app.rb Gemfile ./
 
 ENV GEM_HOME=${LAMBDA_TASK_ROOT}
+
+# Install dev tools so that `bigdecimal` (a dep of httparty) can be installed
+RUN yum install gcc make -y
 RUN bundle install
+# Remove the dev tools
+RUN yum uninstall gcc make -y
 
 # Command can be overwritten by providing a different command in the template directly.
 CMD ["app.lambda_handler"]