diff --git a/t/Dockerfile b/t/Dockerfile
index 50fa904..1ee5662 100644
--- a/t/Dockerfile
+++ b/t/Dockerfile
@@ -5,7 +5,7 @@ FROM docker.mgm.sipwise.com/sipwise-buster:latest
 # is updated with the current date. It will force refresh of all
 # of the base images and things like `apt-get update` won't be using
 # old cached versions when the Dockerfile is built.
-ENV REFRESHED_AT 2019-06-18
+ENV REFRESHED_AT 2020-05-08
 
 RUN apt-get update && apt-get install --assume-yes git make gcc dpkg-dev