diff --git a/pypy/master/Dockerfile b/pypy/master/Dockerfile
index 7390d63..2cf26ad 100644
--- a/pypy/master/Dockerfile
+++ b/pypy/master/Dockerfile
@@ -1,2 +1,2 @@
-from pypy:2-onbuild
+from pypy:3-onbuild
 CMD /usr/src/app/start_buildbot.sh