diff --git a/base/Dockerfile b/base/Dockerfile
index 483cbe9..a6c19cc 100644
--- a/base/Dockerfile
+++ b/base/Dockerfile
@@ -1,8 +1,8 @@
-FROM tier/shib-idp:3.4.7_20200702 as idp
+FROM tier/shib-idp:latest4 as idp
 # latest 3.x is tier/shib-idp:3.4.7_20200702
 
 # Grouper version for the entire GTE
-FROM i2incommon/grouper:2.6.19.3
+FROM i2incommon/grouper:4.5.2
 
 # Disable docker HEALTHCHECK inherited from tier/shib-sp
 HEALTHCHECK NONE