diff --git a/base/Dockerfile b/base/Dockerfile
index 3d870f6..cf8b341 100644
--- a/base/Dockerfile
+++ b/base/Dockerfile
@@ -1,7 +1,7 @@
 FROM tier/shib-idp:3.4.3_20190201 as idp
 
 # Grouper version for the entire GTE
-FROM tier/grouper:latest
+FROM tier/grouper:2.4.0-a80-u51-w10-p11-20191031-rc1
 
 # Disable docker HEALTHCHECK inherited from tier/shib-sp
 HEALTHCHECK NONE