diff --git a/speedtest/speedtest.go b/speedtest/speedtest.go
index c9177d6..5a64f05 100644
--- a/speedtest/speedtest.go
+++ b/speedtest/speedtest.go
@@ -11,7 +11,7 @@ import (
 )
 
 var (
-	version          = "1.6.5"
+	version          = "1.6.6"
 	DefaultUserAgent = fmt.Sprintf("showwin/speedtest-go %s", version)
 )