diff --git a/Dockerfile b/Dockerfile
index 986e99530ae76aecad77afbbf9561cb7aaf1300c..617f4184fc2c41a11a624280de07a19c78b9611a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM openzipkin/zipkin-dependencies
+FROM openzipkin/zipkin-dependencies@sha256:400a4606bbc4b9c778e6d6a6e7956a9bf0f5c614385e8987e285f3095221b22f
 
 USER root
 RUN chmod 644 /var/spool/cron/crontabs/root