diff --git a/stm-hamt.cabal b/stm-hamt.cabal
--- a/stm-hamt.cabal
+++ b/stm-hamt.cabal
@@ -1,5 +1,5 @@
 name: stm-hamt
-version: 1.2.0.1
+version: 1.2.0.2
 synopsis: STM-specialised Hash Array Mapped Trie
 description:
   A low-level data-structure,
@@ -35,7 +35,7 @@
     StmHamt.ListT
   build-depends:
     base >=4.9 && <5,
-    deferred-folds >=0.7 && <0.9,
+    deferred-folds >=0.9 && <0.10,
     focus >=1 && <1.1,
     hashable <2,
     list-t >=1.0.1 && <1.1,