diff --git a/.gitmodules b/.gitmodules
index 052a3d3..7db64f5 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -5,3 +5,4 @@
 [submodule "defaults/threema"]
 	path = defaults/threema
 	url = git@git.threema.ch:fah/nixos-config.git
+	branch = 38-migrate-to-nix-flakes
diff --git a/qois-infrastructure b/qois-infrastructure
index f7e0a51..ccee28f 160000
--- a/qois-infrastructure
+++ b/qois-infrastructure
@@ -1 +1 @@
-Subproject commit f7e0a51e165a6f2cd35e9edd001db504ea6fe5f7
+Subproject commit ccee28f669dda9491d934a0ac00ac9b48fc5e326