diff --git a/example/Main.hs b/example/Main.hs
index d601a32..3dc68c4 100644
--- a/example/Main.hs
+++ b/example/Main.hs
@@ -26,7 +26,6 @@ import Data.Aeson.Encode.Pretty
 import Data.ByteString.Lazy (fromStrict, toStrict)
 import qualified Data.Map as M
 import Data.Maybe (fromJust)
-import Data.Monoid ((<>))
 import Data.Text (Text)
 import qualified Data.Text as T
 import Data.Text.Encoding (decodeUtf8)
diff --git a/src/Yesod/Auth/OAuth2/Dispatch.hs b/src/Yesod/Auth/OAuth2/Dispatch.hs
index a90ce57..f96581a 100644
--- a/src/Yesod/Auth/OAuth2/Dispatch.hs
+++ b/src/Yesod/Auth/OAuth2/Dispatch.hs
@@ -14,7 +14,6 @@ where
 
 import Control.Exception.Safe
 import Control.Monad (unless, (<=<))
-import Data.Monoid ((<>))
 import Data.Text (Text)
 import qualified Data.Text as T
 import Data.Text.Encoding (encodeUtf8)
diff --git a/src/Yesod/Auth/OAuth2/Prelude.hs b/src/Yesod/Auth/OAuth2/Prelude.hs
index c7e52c9..2054c37 100644
--- a/src/Yesod/Auth/OAuth2/Prelude.hs
+++ b/src/Yesod/Auth/OAuth2/Prelude.hs
@@ -60,7 +60,6 @@ import Control.Exception.Safe
 import Data.Aeson
 import Data.ByteString (ByteString)
 import qualified Data.ByteString.Lazy as BL
-import Data.Semigroup ((<>))
 import Data.Text (Text)
 import qualified Data.Text as T
 import Data.Text.Encoding
diff --git a/stack-nightly.yaml b/stack-nightly.yaml
index 78908a1..6fe487e 100644
--- a/stack-nightly.yaml
+++ b/stack-nightly.yaml
@@ -1,8 +1,8 @@
 # Overridden by --resolver on CI
-resolver: nightly-2018-11-24
+resolver: nightly-2019-11-29
 extra-deps:
-  # should be in nightly in a day
-  - hoauth2-1.8.3
+  - hoauth2-1.8.9@sha256:63929253f6cdeb096a369980d2acf0d7eedd0c98ac46f962f717c56b724069a4,5734
+allow-newer: true
 
 # Fix for weeder with stack-2
 ghc-options:
diff --git a/stack-nightly.yaml.lock b/stack-nightly.yaml.lock
new file mode 100644
index 0000000..73a2a86
--- /dev/null
+++ b/stack-nightly.yaml.lock
@@ -0,0 +1,19 @@
+# This file was autogenerated by Stack.
+# You should not edit this file by hand.
+# For more information, please see the documentation at:
+#   https://docs.haskellstack.org/en/stable/lock_files
+
+packages:
+- completed:
+    hackage: hoauth2-1.8.9@sha256:63929253f6cdeb096a369980d2acf0d7eedd0c98ac46f962f717c56b724069a4,5734
+    pantry-tree:
+      size: 1986
+      sha256: 1c2901e88e82128b1e7f46e4b58eaeec779a630f0e30eb8bc226cb8ebb521bf8
+  original:
+    hackage: hoauth2-1.8.9@sha256:63929253f6cdeb096a369980d2acf0d7eedd0c98ac46f962f717c56b724069a4,5734
+snapshots:
+- completed:
+    size: 434661
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/nightly/2019/11/29.yaml
+    sha256: 9edba401b588c0b8359262043b51f0bd33e2334802f0a1467eb660a23601eaf6
+  original: nightly-2019-11-29