diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,10 @@
 # Revision history for greskell
 
+## 0.2.1.1  -- 2018-10-03
+
+* Confirm test with `base-4.12.0.0`
+
+
 ## 0.2.1.0  -- 2018-08-17
 
 ### GTraversal module
diff --git a/greskell.cabal b/greskell.cabal
--- a/greskell.cabal
+++ b/greskell.cabal
@@ -1,5 +1,5 @@
 name:                   greskell
-version:                0.2.1.0
+version:                0.2.1.1
 author:                 Toshio Ito <debug.ito@gmail.com>
 maintainer:             Toshio Ito <debug.ito@gmail.com>
 license:                BSD3
@@ -33,7 +33,7 @@
                         Data.Greskell.Graph,
                         Data.Greskell.GTraversal
   -- other-modules:        
-  build-depends:        base >=4.9.0.0 && <4.12,
+  build-depends:        base >=4.9.0.0 && <4.13,
                         greskell-core >=0.1.2.0 && <0.2,
                         text >=1.2.2.1 && <1.3,
                         transformers >=0.5.2 && <0.6,