diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,3 +11,7 @@
 ## 0.1.2.0 -- 2020-09-16
 
 * No changes
+
+## 0.1.2.1 -- 2020-09-16
+
+* Attempt to fix docs building on ghc862
diff --git a/lti13.cabal b/lti13.cabal
--- a/lti13.cabal
+++ b/lti13.cabal
@@ -1,7 +1,7 @@
 cabal-version:       >=1.10
 
 name:                lti13
-version:             0.1.2.0
+version:             0.1.2.1
 synopsis:            Core functionality for LTI 1.3.
 description:         A library implementing the core
                      <http://www.imsglobal.org/spec/lti/v1p3/ LTI 1.3> authentication protocol,
diff --git a/src/Web/LTI13.hs b/src/Web/LTI13.hs
--- a/src/Web/LTI13.hs
+++ b/src/Web/LTI13.hs
@@ -28,6 +28,7 @@
 import Jose.Jwa (JwsAlg(RS256))
 import qualified Jose.Jwk as Jwk
 import Control.Monad (when, (>=>))
+import qualified Control.Monad.Fail as Fail
 import Control.Exception.Safe (MonadCatch, catch, throwM, Typeable, Exception, MonadThrow, throw)
 import Control.Monad.IO.Class (liftIO, MonadIO)
 import Data.Aeson (eitherDecode, FromJSON (parseJSON), ToJSON(toJSON, toEncoding), Object,
@@ -136,7 +137,7 @@
 newtype LtiTokenClaims = LtiTokenClaims UncheckedLtiTokenClaims
     deriving (Show)
 
-limitLength :: (MonadFail m) => Int -> Text -> m Text
+limitLength :: (Fail.MonadFail m) => Int -> Text -> m Text
 limitLength len string
     | (T.length string) <= len
     = return string