diff --git a/build/docker/ubuntu-disco/Dockerfile b/build/docker/ubuntu-disco/Dockerfile
index 2c3166f..9775fbb 100644
--- a/build/docker/ubuntu-disco/Dockerfile
+++ b/build/docker/ubuntu-disco/Dockerfile
@@ -179,7 +179,8 @@
 # Test dependencies for running puppeteer
 RUN apt-get install -y --no-install-recommends \
 `# JS dependencies` \
-      libxss1
+      libxss1 \
+      libxtst6
 
 # does not work on disco?
 # RUN apt-get install -y --no-install-recommends \