diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # Revision history for greskell-websocket
 
+## 0.1.2.2  -- 2020-05-04
+
+* Confirm test with `base64-bytestring-1.1.0.0`.
+
 ## 0.1.2.1  -- 2019-12-30
 
 * Confirm test with `base-4.13.0.0`
diff --git a/greskell-websocket.cabal b/greskell-websocket.cabal
--- a/greskell-websocket.cabal
+++ b/greskell-websocket.cabal
@@ -1,5 +1,5 @@
 name:                   greskell-websocket
-version:                0.1.2.1
+version:                0.1.2.2
 author:                 Toshio Ito <debug.ito@gmail.com>
 maintainer:             Toshio Ito <debug.ito@gmail.com>
 license:                BSD3
@@ -46,7 +46,7 @@
   build-depends:        base >=4.9.1.0 && <4.14,
                         greskell-core >=0.1.2.0 && <0.2,
                         bytestring >=0.10.8.1 && <0.11,
-                        base64-bytestring >=1.0.0.1 && <1.1,
+                        base64-bytestring >=1.0.0.1 && <1.2,
                         text >=1.2.2.2 && <1.3,
                         aeson >=1.1.2.0 && <1.5,
                         unordered-containers >=0.2.8 && <0.3,