diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # Revision history for greskell-core
 
+## 0.1.3.7  -- 2021-11-08
+
+* Confirm test with `base-4.15.0.0`
+
 ## 0.1.3.6  -- 2021-02-11
 
 * Confirm test with `doctest-0.18`.
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:                0.1.3.6
+version:                0.1.3.7
 author:                 Toshio Ito <debug.ito@gmail.com>
 maintainer:             Toshio Ito <debug.ito@gmail.com>
 license:                BSD3
@@ -30,7 +30,7 @@
                         Data.Greskell.AsIterator
   other-modules:        Data.Greskell.GraphSON.GraphSONTyped,
                         Data.Greskell.GraphSON.Core
-  build-depends:        base >=4.9.0.0 && <4.15,
+  build-depends:        base >=4.9.0.0 && <4.16,
                         aeson >=1.0.2.1 && <1.6,
                         unordered-containers >=0.2.7.1 && <0.3,
                         hashable >=1.2.6.1 && <1.4,
@@ -66,11 +66,10 @@
   hs-source-dirs:       test
   ghc-options:          -Wall -fno-warn-unused-imports "-with-rtsopts=-M512m"
   main-is:              DocTest.hs
-  build-tool-depends:   doctest-discover:doctest-discover, doctest:doctest
+  build-tool-depends:   doctest-discover:doctest-discover
   build-depends:        base,
                         doctest >=0.11 && <0.19,
                         doctest-discover >=0.1.0.7 && <0.3
-
 
 
 source-repository head