diff --git a/raven-haskell.cabal b/raven-haskell.cabal
--- a/raven-haskell.cabal
+++ b/raven-haskell.cabal
@@ -1,13 +1,13 @@
 name:                raven-haskell
-version:             0.1.3.0
+version:             0.1.4.0
 synopsis:            Haskell client for Sentry logging service.
--- description:         
+-- description:
 homepage:            https://bitbucket.org/dpwiz/raven-haskell
 license:             MIT
 license-file:        LICENSE
 author:              Alexander Bondarenko
 maintainer:          aenor.realm@gmail.com
--- copyright:           
+-- copyright:
 category:            Logging
 build-type:          Simple
 cabal-version:       >=1.8
@@ -37,7 +37,7 @@
     text,
     time >= 1.5.0.1,
     unordered-containers,
-    uuid
+    uuid-types
 
 test-suite test
   type: exitcode-stdio-1.0
diff --git a/src/System/Log/Raven.hs b/src/System/Log/Raven.hs
--- a/src/System/Log/Raven.hs
+++ b/src/System/Log/Raven.hs
@@ -54,10 +54,10 @@
     , record, recordLBS
     ) where
 
-import Data.Aeson (encode)
+import Data.Aeson (Value, encode)
 import Data.ByteString.Lazy (ByteString)
 
-import Data.UUID (UUID)
+import Data.UUID.Types (UUID)
 import System.Random (randomIO)
 import Data.Time.Clock (getCurrentTime)
 import System.IO (stderr, hPutStrLn)
@@ -142,5 +142,5 @@
 tags ts r = r { srTags = HM.fromList ts `HM.union` srTags r }
 
 -- | Add record extra information.
-extra :: [(String, String)] -> SentryRecord -> SentryRecord
+extra :: [(String, Value)] -> SentryRecord -> SentryRecord
 extra ts r =  r { srExtra = HM.fromList ts `HM.union` srExtra r }
diff --git a/src/System/Log/Raven/Types.hs b/src/System/Log/Raven/Types.hs
--- a/src/System/Log/Raven/Types.hs
+++ b/src/System/Log/Raven/Types.hs
@@ -101,7 +101,7 @@
                                  , srTags        :: !Assoc
                                  , srServerName  :: Maybe String
                                  , srModules     :: !Assoc
-                                 , srExtra       :: !Assoc
+                                 , srExtra       :: HM.HashMap String Value
                                  , srInterfaces  :: HM.HashMap String Value
                                  , srRelease     :: Maybe String
                                  , srEnvironment :: Maybe String