diff --git a/src/Yesod/ReCaptcha2.hs b/src/Yesod/ReCaptcha2.hs
--- a/src/Yesod/ReCaptcha2.hs
+++ b/src/Yesod/ReCaptcha2.hs
@@ -11,14 +11,14 @@
 
 -- | default key is testing. you should impl reCaptchaSiteKey and reCaptchaSecretKey
 class YesodAuth site => YesodReCaptcha site where
-    reCaptchaSiteKey :: HandlerT site IO Text
+    reCaptchaSiteKey :: HandlerFor site Text
     reCaptchaSiteKey = pure "6LeIxAcTAAAAAJcZVRqyHh71UMIEGNQ_MXjiZKhI"
-    reCaptchaSecretKey :: HandlerT site IO Text
+    reCaptchaSecretKey :: HandlerFor site Text
     reCaptchaSecretKey = pure "6LeIxAcTAAAAAGG-vFI1TnRWxMZNFuojJ4WifJWe"
     -- | with specific language from <https://developers.google.com/recaptcha/docs/language>
     --
     -- > reCaptchaLanguage = pure (Just "ru")
-    reCaptchaLanguage :: HandlerT site IO (Maybe Text)
+    reCaptchaLanguage :: HandlerFor site (Maybe Text)
     reCaptchaLanguage = pure Nothing
 
 newtype SiteverifyResponse
@@ -28,13 +28,13 @@
     deriving (Eq, Ord, Read, Show, Generic, FromJSON, ToJSON)
 
 -- | for Applicative style form
-reCaptcha :: YesodReCaptcha site => AForm (HandlerT site IO) ()
+reCaptcha :: YesodReCaptcha site => AForm (HandlerFor site) ()
 reCaptcha = formToAForm mReCaptcha
 
 -- | for Monadic style form
-mReCaptcha :: YesodReCaptcha site => MForm (HandlerT site IO) (FormResult (), [FieldView site])
+mReCaptcha :: YesodReCaptcha site => MForm (HandlerFor site) (FormResult (), [FieldView site])
 mReCaptcha = do
-    result <- liftHandlerT formResult
+    result <- lift formResult
     return (result, [fieldViewSite])
   where formResult = do
             postParam <- lookupPostParam "g-recaptcha-response"
diff --git a/yesod-recaptcha2.cabal b/yesod-recaptcha2.cabal
--- a/yesod-recaptcha2.cabal
+++ b/yesod-recaptcha2.cabal
@@ -1,9 +1,11 @@
--- This file has been generated from package.yaml by hpack version 0.17.1.
+-- This file has been generated from package.yaml by hpack version 0.20.0.
 --
 -- see: https://github.com/sol/hpack
+--
+-- hash: d33d7c41317f538fc8619b0117572564e3a742273756bae5f8ae1271aa6f36b4
 
 name:           yesod-recaptcha2
-version:        0.2.3
+version:        0.2.4
 synopsis:       yesod recaptcha2
 description:    recaptcha2 for yesod-form
 category:       Web
@@ -28,10 +30,12 @@
   hs-source-dirs:
       src
   build-depends:
-      base >= 4.7 && < 5
+      base >=4.7 && <5
     , classy-prelude-yesod
     , http-conduit
     , yesod-auth
   exposed-modules:
       Yesod.ReCaptcha2
+  other-modules:
+      Paths_yesod_recaptcha2
   default-language: Haskell2010