diff --git a/submodules/vierkant b/submodules/vierkant
index 838afa8..091f3ce 160000
--- a/submodules/vierkant
+++ b/submodules/vierkant
@@ -1 +1 @@
-Subproject commit 838afa8b14d75d5bbfcc9d81fc02d119b4ba2a61
+Subproject commit 091f3cef64a1c37421644f9741c6715530b779f1