diff --git a/hoauth2.cabal b/hoauth2.cabal
--- a/hoauth2.cabal
+++ b/hoauth2.cabal
@@ -1,6 +1,6 @@
 Name:                hoauth2
 -- http://wiki.haskell.org/Package_versioning_policy
-Version:             0.5.1
+Version:             0.5.2
 
 Synopsis:            Haskell OAuth2 authentication client
 Description:
@@ -26,7 +26,7 @@
 Copyright:           Haisheng Wu
 Category:            Network
 Build-type:          Simple
-stability:           alpha
+stability:           Beta
 tested-with:         GHC <= 7.10.2
 
 Extra-source-files:
@@ -58,12 +58,12 @@
     Network.OAuth.OAuth2
 
   Build-Depends:
-    base              >= 4      && < 5,
-    aeson             >= 0.10   && < 0.11,
-    text              >= 0.11   && < 1.3,
-    bytestring        >= 0.9    && < 0.11,
-    http-conduit      >= 2.0    && < 2.2,
-    http-types        >= 0.9    && < 0.10
+    base              >= 4     && < 5,
+    aeson             >= 0.9   && < 0.11,
+    text              >= 0.11  && < 1.3,
+    bytestring        >= 0.9   && < 0.11,
+    http-conduit      >= 2.0   && < 2.2,
+    http-types        >= 0.9   && < 0.10
 
   if impl(ghc >= 6.12.0)
       ghc-options: -Wall -fwarn-tabs -funbox-strict-fields
@@ -80,7 +80,7 @@
   main-is:             Weibo/test.hs
   hs-source-dirs:      example
   default-language:    Haskell2010
-  build-depends:       base              >= 4.5     && < 5,
+  build-depends:       base              >= 4.5    && < 5,
                        http-types        >= 0.9    && < 0.10,
                        http-conduit      >= 2.0    && < 2.2,
                        text              >= 0.11   && < 1.3,
@@ -103,12 +103,12 @@
   main-is:             Google/test.hs
   hs-source-dirs:      example
   default-language:    Haskell2010
-  build-depends:       base              >= 4.5     && < 5,
+  build-depends:       base              >= 4.5    && < 5,
                        http-types        >= 0.9    && < 0.10,
                        http-conduit      >= 2.0    && < 2.2,
                        text              >= 0.11   && < 1.3,
                        bytestring        >= 0.9    && < 0.11,
-                       aeson             >= 0.10   && < 0.11,
+                       aeson             >= 0.9    && < 0.11,
                        hoauth2
 
   if impl(ghc >= 6.12.0)
@@ -132,7 +132,7 @@
                        http-conduit      >= 2.0    && < 2.2,
                        text              >= 0.11   && < 1.3,
                        bytestring        >= 0.9    && < 0.11,
-                       aeson             >= 0.10   && < 0.11,
+                       aeson             >= 0.9    && < 0.11,
                        hoauth2
 
   if impl(ghc >= 6.12.0)
@@ -150,12 +150,12 @@
   main-is:             Douban/test.hs
   hs-source-dirs:      example
   default-language:    Haskell2010
-  build-depends:       base              >= 4.5     && < 5,
+  build-depends:       base              >= 4.5    && < 5,
                        http-types        >= 0.9    && < 0.10,
                        http-conduit      >= 2.0    && < 2.2,
                        text              >= 0.11   && < 1.3,
                        bytestring        >= 0.9    && < 0.11,
-                       aeson             >= 0.10   && < 0.11,
+                       aeson             >= 0.9    && < 0.11,
                        hoauth2
 
   if impl(ghc >= 6.12.0)
@@ -173,12 +173,12 @@
   main-is:             Facebook/test.hs
   hs-source-dirs:      example
   default-language:    Haskell2010
-  build-depends:       base              >= 4.5     && < 5,
+  build-depends:       base              >= 4.5    && < 5,
                        http-types        >= 0.9    && < 0.10,
                        http-conduit      >= 2.0    && < 2.2,
                        text              >= 0.11   && < 1.3,
                        bytestring        >= 0.9    && < 0.11,
-                       aeson             >= 0.10   && < 0.11,
+                       aeson             >= 0.9    && < 0.11,
                        hoauth2
 
   if impl(ghc >= 6.12.0)
@@ -197,7 +197,7 @@
   hs-source-dirs:      example
   default-language:    Haskell2010
   build-depends:       base              >= 4.5    && < 5,
-                       aeson             >= 0.10   && < 0.11,
+                       aeson             >= 0.9    && < 0.11,
                        text              >= 0.11   && < 1.3,
                        bytestring        >= 0.9    && < 0.11,
                        http-conduit      >= 2.0    && < 2.2,