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: 1.2.0.6
+version: 1.2.0.7
 synopsis: STM-specialised Hash Array Mapped Trie
 description:
   A low-level data-structure,
@@ -76,7 +76,7 @@
     focus,
     free >=4.5 && <6,
     list-t,
-    mwc-random >=0.13 && <0.15,
+    mwc-random >=0.13 && <0.16,
     mwc-random-monad ==0.7.*,
     rebase <2,
     stm-hamt