diff --git a/yesod-auth.cabal b/yesod-auth.cabal
index e8836861..9e20d17d 100644
--- a/yesod-auth.cabal
+++ b/yesod-auth.cabal
@@ -18,7 +18,7 @@ library
                    , yesod                   >= 0.6       && < 0.7
                    , wai                     >= 0.2       && < 0.3
                    , template-haskell
-                   , pureMD5                 >= 1.1       && < 1.2
+                   , pureMD5                 >= 1.1       && < 2.2
                    , random                  >= 1.0       && < 1.1
                    , data-object             >= 0.3.1.3   && < 0.4
                    , control-monad-attempt   >= 0.3.0     && < 0.4