diff --git a/CHANGELOG.md b/CHANGELOG.md
index 07bc494c..6afbd5ce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,7 +3,21 @@
 This project follows [semver 2.0.0](http://semver.org/spec/v2.0.0.html) and the
 recommendations of [keepachangelog.com](http://keepachangelog.com/).
 
-## 9.0.0 (Unreleased)
+## Unreleased
+
+### Breaking Changes
+
+- None
+
+### Added
+
+- None
+
+### Fixed
+
+- None
+
+## 9.0.0 (2018-03-26)
 
 ### Breaking Changes, Major
 
diff --git a/README.md b/README.md
index 0a417f2d..88826e4e 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,8 @@ has been destroyed.
 | Version        | Documentation |
 | -------------- | ------------- |
 | Unreleased     | https://github.com/airblade/paper_trail/blob/master/README.md |
-| 8.1.1          | https://github.com/airblade/paper_trail/blob/v8.1.1/README.md |
+| 9.0.0          | https://github.com/airblade/paper_trail/blob/v9.0.0/README.md |
+| 8.1.2          | https://github.com/airblade/paper_trail/blob/v8.1.2/README.md |
 | 7.1.3          | https://github.com/airblade/paper_trail/blob/v7.1.3/README.md |
 | 6.0.2          | https://github.com/airblade/paper_trail/blob/v6.0.2/README.md |
 | 5.2.3          | https://github.com/airblade/paper_trail/blob/v5.2.3/README.md |
@@ -77,9 +78,10 @@ has been destroyed.
 | paper_trail    | branch     | tags   | ruby     | activerecord  |
 | -------------- | ---------- | ------ | -------- | ------------- |
 | unreleased     | master     |        | >= 2.3.0 | >= 4.2, < 6   |
-| 8              | master     | v8.x   | >= 2.2.0 | >= 4.2, < 6   |
-| 7              | 7-stable   | v7.x   | >= 2.1.0 | >= 4.0, < 6   |
-| 6              | 6-stable   | v6.x   | >= 1.9.3 | >= 4.0, < 6   |
+| 9              | 9-stable   | v9.x   | >= 2.3.0 | >= 4.2, < 6   |
+| 8              | 8-stable   | v8.x   | >= 2.2.0 | >= 4.2, < 5.2 |
+| 7              | 7-stable   | v7.x   | >= 2.1.0 | >= 4.0, < 5.2 |
+| 6              | 6-stable   | v6.x   | >= 1.9.3 | >= 4.0, < 5.2 |
 | 5              | 5-stable   | v5.x   | >= 1.9.3 | >= 3.0, < 5.1 |
 | 4              | 4-stable   | v4.x   | >= 1.8.7 | >= 3.0, < 5.1 |
 | 3              | 3.0-stable | v3.x   | >= 1.8.7 | >= 3.0, < 5   |
diff --git a/lib/paper_trail/version_number.rb b/lib/paper_trail/version_number.rb
index 65002b66..2175ec50 100644
--- a/lib/paper_trail/version_number.rb
+++ b/lib/paper_trail/version_number.rb
@@ -7,9 +7,9 @@ module PaperTrail
   # because of this confusion, but it's not worth the breaking change.
   # People are encouraged to use `PaperTrail.gem_version` instead.
   module VERSION
-    MAJOR = 8
-    MINOR = 1
-    TINY = 2
+    MAJOR = 9
+    MINOR = 0
+    TINY = 0
     PRE = nil
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".").freeze