diff --git a/servant-swagger-ui-core/servant-swagger-ui-core.cabal b/servant-swagger-ui-core/servant-swagger-ui-core.cabal
index 796a4c6..d2d0730 100644
--- a/servant-swagger-ui-core/servant-swagger-ui-core.cabal
+++ b/servant-swagger-ui-core/servant-swagger-ui-core.cabal
@@ -49,7 +49,7 @@ library
     , servant-server       >=0.14     && <0.21
     , text                 >=1.2.3.0  && <2.2
     , transformers         >=0.3      && <0.7
-    , transformers-compat  >=0.3      && <0.8
+    , transformers-compat >=0.3 && <0.9
     , wai-app-static       >=3.0.1.1  && <3.3
 
   exposed-modules:  Servant.Swagger.UI.Core