diff --git a/Dockerfile.gitlab-docs-lint b/Dockerfile.gitlab-docs-lint
index 3720d41..5d03bd8 100644
--- a/Dockerfile.gitlab-docs-lint
+++ b/Dockerfile.gitlab-docs-lint
@@ -1,4 +1,4 @@
-FROM ruby:2.6.3-alpine3.8
+FROM ruby:2.6.3-alpine3.9
 MAINTAINER GitLab Documentation Team
 
 WORKDIR /tmp
@@ -6,10 +6,7 @@ WORKDIR /tmp
 RUN apk update && apk upgrade && apk add --no-cache \
   build-base \
   bash \
-  grep \
-  yarn
-
-RUN yarn global add markdownlint-cli && yarn cache clean
+  grep
 
 RUN wget https://gitlab.com/gitlab-com/gitlab-docs/-/archive/master/gitlab-docs-master.tar.bz2 \
   && tar xvjf gitlab-docs-master.tar.bz2 \