diff --git a/stm-hamt.cabal b/stm-hamt.cabal
--- a/stm-hamt.cabal
+++ b/stm-hamt.cabal
@@ -1,6 +1,6 @@
 cabal-version: 3.0
 name: stm-hamt
-version: 1.2.1
+version: 1.2.1.1
 synopsis: STM-specialised Hash Array Mapped Trie
 description:
   A low-level data-structure,
@@ -103,7 +103,7 @@
     stm-hamt,
     tasty >=0.12 && <2,
     tasty-hunit >=0.9 && <0.11,
-    tasty-quickcheck >=0.9 && <0.11,
+    tasty-quickcheck >=0.9 && <0.12,
 
 benchmark concurrent-insertion-bench
   import: base