diff --git a/yesod-core/yesod-core.cabal b/yesod-core/yesod-core.cabal
index 6de8138d..d1359788 100644
--- a/yesod-core/yesod-core.cabal
+++ b/yesod-core/yesod-core.cabal
@@ -47,7 +47,7 @@ library
                    , enumerator                >= 0.4.7    && < 0.5
                    , cookie                    >= 0.3      && < 0.4
                    , blaze-html                >= 0.4      && < 0.5
-                   , http-types                >= 0.6      && < 0.7
+                   , http-types                >= 0.6.5    && < 0.7
                    , case-insensitive          >= 0.2      && < 0.4
                    , parsec                    >= 2        && < 3.2
                    , directory                 >= 1        && < 1.2