--- a/semigroups.cabal
+++ b/semigroups.cabal
@@ -175,7 +175,7 @@ library
       build-depends: text >= 0.10 && < 2
 
     if flag(hashable)
-      build-depends: hashable >= 1.2.5.0  && < 1.5
+      build-depends: hashable >= 1.2.5.0  && < 1.6
 
     if flag(hashable) && flag(unordered-containers)
       build-depends: unordered-containers >= 0.2  && < 0.3
