diff --git a/Dockerfile.danger b/Dockerfile.danger
index d1248f3..a3ae1ed 100644
--- a/Dockerfile.danger
+++ b/Dockerfile.danger
@@ -6,6 +6,8 @@ ADD /scripts/ /scripts/
 RUN apt-get update \
     && apt-get install -y git \
     && /scripts/install-node 10.x 1.12.3-1 \
+    && yarn global add alex \
+    && yarn cache clean \
     && apt-get autoremove -yq \
     && apt-get clean -yqq \
     && rm -rf /var/lib/apt/lists/* \