diff --git a/ChangeLog b/ChangeLog
index b38193c23..5428760fc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+9.0.0:
+- Compatibility with v6.1 of the API: https://developers.google.com/google-ads/api/docs/release-notes
+- Removed support for v3.
+
 8.1.0:
  - Added support for loading configuration from environment variables in
 	 addition to existing methods.
diff --git a/lib/google/ads/google_ads/version.rb b/lib/google/ads/google_ads/version.rb
index 084795ad8..e060cf3bc 100644
--- a/lib/google/ads/google_ads/version.rb
+++ b/lib/google/ads/google_ads/version.rb
@@ -19,7 +19,7 @@
 module Google
   module Ads
     module GoogleAds
-      CLIENT_LIB_VERSION = '8.1.0'.freeze
+      CLIENT_LIB_VERSION = '9.0.0'.freeze
       VERSION = CLIENT_LIB_VERSION
     end
   end