diff --git a/pusher-http-haskell.cabal b/pusher-http-haskell.cabal
--- a/pusher-http-haskell.cabal
+++ b/pusher-http-haskell.cabal
@@ -1,6 +1,6 @@
 cabal-version: 1.18
 name:          pusher-http-haskell
-version:       2.1.0.25
+version:       2.1.0.26
 license:       MIT
 license-file:  LICENSE
 copyright:     (c) Will Sewell, 2016
@@ -43,7 +43,7 @@
         base >=4.11 && <4.23,
         bytestring >=0.10 && <0.13,
         base16-bytestring >=0.1 && <1.1,
-        crypton ==1.1.*,
+        crypton >=1.1 && <2.2,
         hashable >=1.2 && <1.6,
         http-client >=0.4.30 && <0.8,
         http-client-tls >=0.3 && <0.5,