diff --git a/.travis.yml b/.travis.yml
index 5ede5890..a0991072 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -37,6 +37,9 @@ install:
   - echo "TRAVIS_GO_VERSION=$TRAVIS_GO_VERSION"
   - dep status -v
 
+after_success:
+  - make clean
+
 deploy:
   - provider: script
     skip_cleanup: true
diff --git a/acme/api/internal/sender/useragent.go b/acme/api/internal/sender/useragent.go
index c7ec0a11..66ab8e28 100644
--- a/acme/api/internal/sender/useragent.go
+++ b/acme/api/internal/sender/useragent.go
@@ -5,10 +5,10 @@ package sender
 
 const (
 	// ourUserAgent is the User-Agent of this underlying library package.
-	ourUserAgent = "xenolf-acme/2.0.0"
+	ourUserAgent = "xenolf-acme/2.0.1"
 
 	// ourUserAgentComment is part of the UA comment linked to the version status of this underlying library package.
 	// values: detach|release
 	// NOTE: Update this with each tagged release.
-	ourUserAgentComment = "detach"
+	ourUserAgentComment = "release"
 )