diff --git a/Dockerfile b/Dockerfile
index a4ee876..2a60961 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,8 @@
 FROM yarnpkg/node-yarn:0.20-node7
 
 ENV YARN_VERSION 0.22.0-1
-
-RUN apt-get update && apt-get install yarn=${YARN_VERSION}
+RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add - && \
+    apt-get update && apt-get install yarn=${YARN_VERSION}
 
 WORKDIR /opt/rf-docs
 
@@ -10,4 +10,4 @@ COPY yarn.lock package.json /opt/rf-docs/
 
 RUN yarn install --pure-lockfile
 
-COPY . /opt/rf-docs/
\ No newline at end of file
+COPY . /opt/rf-docs/