diff --git a/Dockerfile b/Dockerfile
index 3256f6f..6a7fd11 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,9 +19,10 @@ ENV \
 ARG UID=991
 ARG GID=991
 
-# mastodon v3.0.1
+# this repo master maps to upstream master, branches in this repo
+# map to specific upstream commits that are released as versions
 ARG REPO_URL=https://github.com/tootsuite/mastodon.git
-ARG REPO_REV=c4118ba71ba31e408c02d289e111326ccc6f6aa2
+ARG REPO_REV=master
 
 # install os prereq stuff to image
 ADD prereqs.sh /tmp/prereqs.sh