diff --git a/happstack-server.cabal b/happstack-server.cabal
--- a/happstack-server.cabal
+++ b/happstack-server.cabal
@@ -1,5 +1,5 @@
 Name:                happstack-server
-Version:             7.7.1.1
+Version:             7.7.1.2
 Synopsis:            Web related tools and services.
 Description:         Happstack Server provides an HTTP server and a rich set of functions for routing requests, handling query parameters, generating responses, working with cookies, serving files, and more. For in-depth documentation see the Happstack Crash Course <http://happstack.com/docs/crashcourse/index.html>
 License:             BSD3
@@ -11,7 +11,7 @@
 Build-Type:          Simple
 Cabal-Version:       >= 1.10
 Extra-Source-Files:  tests/Happstack/Server/Tests.hs README.md
-tested-with:         GHC==8.0.1, GHC==8.2.2, GHC==8.4.1, GHC==8.6.5, GHC==8.8.3, GHC==8.10.1
+tested-with:         GHC==8.0.1, GHC==8.2.2, GHC==8.4.1, GHC==8.6.5, GHC==8.8.3, GHC==8.10.1, GHC==9.0.1
 
 source-repository head
     type:     git
@@ -89,9 +89,9 @@
                        text                   >= 0.10  && < 1.3,
                        time,
                        threads                >= 0.5,
-                       transformers           >= 0.1.3 && < 0.6,
+                       transformers           >= 0.1.3 && < 0.7,
                        transformers-base      >= 0.4   && < 0.5,
-                       transformers-compat    >= 0.3   && < 0.7,
+                       transformers-compat    >= 0.3   && < 0.8,
                        utf8-string            >= 0.3.4 && < 1.1,
                        xhtml,
                        zlib