diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # Revision history for greskell-core
 
+## 0.1.3.3  -- 2020-05-30
+
+* Support `aeson-1.5.0.0`.
+
 ## 0.1.3.2  -- 2020-03-29
 
 * Confirm test with `QuickCheck-2.14`.
diff --git a/greskell-core.cabal b/greskell-core.cabal
--- a/greskell-core.cabal
+++ b/greskell-core.cabal
@@ -1,5 +1,5 @@
 name:                   greskell-core
-version:                0.1.3.2
+version:                0.1.3.3
 author:                 Toshio Ito <debug.ito@gmail.com>
 maintainer:             Toshio Ito <debug.ito@gmail.com>
 license:                BSD3
@@ -31,7 +31,7 @@
   other-modules:        Data.Greskell.GraphSON.GraphSONTyped,
                         Data.Greskell.GraphSON.Core
   build-depends:        base >=4.9.0.0 && <4.14,
-                        aeson >=1.0.2.1 && <1.5,
+                        aeson >=1.0.2.1 && <1.6,
                         unordered-containers >=0.2.7.1 && <0.3,
                         hashable >=1.2.6.1 && <1.4,
                         scientific >=0.3.4.9 && <0.4,
diff --git a/src/Data/Greskell/GMap.hs b/src/Data/Greskell/GMap.hs
--- a/src/Data/Greskell/GMap.hs
+++ b/src/Data/Greskell/GMap.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE TypeFamilies, OverloadedStrings, GeneralizedNewtypeDeriving, DeriveTraversable #-}
+{-# LANGUAGE TypeFamilies, OverloadedStrings, GeneralizedNewtypeDeriving, DeriveTraversable, CPP #-}
 -- |
 -- Module: Data.Greskell.GMap
 -- Description: data type for g:Map
@@ -42,7 +42,12 @@
 import qualified Data.Vector as V
 import GHC.Exts (IsList(Item))
 import qualified GHC.Exts as List (IsList(fromList, toList))
+
+#if MIN_VERSION_aeson(1,5,0)
+import Data.Coerce (coerce)
+#else
 import Unsafe.Coerce (unsafeCoerce)
+#endif
 
 import Data.Greskell.GraphSON.GraphSONTyped (GraphSONTyped(..))
 
@@ -239,11 +244,15 @@
     getParser = case fromJSONKey of
       FromJSONKeyText p -> return $ fmap return p
       FromJSONKeyTextParser p -> return p
-      FromJSONKeyCoerce _ -> return $ fmap return unsafeCoerce
       FromJSONKeyValue _ -> fail ( "Unexpected FromJSONKeyValue."
                                    ++ " It expects that the entry key is parsed from the text key in JSON Object,"
                                    ++ " but the key type does not support it."
                                  )
+#if MIN_VERSION_aeson(1,5,0)
+      FromJSONKeyCoerce -> return $ fmap return coerce
+#else
+      FromJSONKeyCoerce _ -> return $ fmap return unsafeCoerce
+#endif
 
 orElseM :: Monad m => m (Maybe a) -> m (Maybe a) -> m (Maybe a)
 orElseM act_a act_b = do