diff --git a/.gitmodules b/.gitmodules
index 4cf9c4d5c..85942066a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,8 +1,8 @@
 [submodule "spack"]
   path = spack
   url = https://github.com/jcsda/spack
-  branch = spack-stack-2.1.0
+  branch = spack-stack-2.1.1
 [submodule "repos/builtin"]
   path = repos/builtin
   url = https://github.com/jcsda/spack-packages
-  branch = release/2.1
+  branch = spack-stack-2.1.1