diff --git a/CHANGELOG.md b/CHANGELOG.md
index 73078ffe..5d4fb296 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 3.3.1 (January 05, 2021)
+
+IMPROVEMENTS:
+* Remane function `retryWithLimitedNumOfRetries` to `retryNTimes`.
+
+BUG FIXES:
+* Convert type of err in `retryNTimes` to `RequestError` type ([PR #170](https://github.com/gridscale/gsclient-go/pull/170)).
+
 ## 3.3.0 (December 17, 2020)
 
 FEATURES::
diff --git a/config.go b/config.go
index c142595b..60edb7c1 100644
--- a/config.go
+++ b/config.go
@@ -12,7 +12,7 @@ import (
 const (
 	defaultMaxNumberOfRetries     = 5
 	defaultDelayIntervalMilliSecs = 1000
-	version                       = "3.3.0"
+	version                       = "3.3.1"
 	defaultAPIURL                 = "https://api.gridscale.io"
 	resourceActiveStatus          = "active"
 	requestDoneStatus             = "done"