diff --git a/CHANGELOG.md b/CHANGELOG.md
index e9aa43cd..76374956 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-## Master
+## [v0.4.0][] (2020-01-16)
 
 * Support `match_array` matcher
 * Support `has_*` matcher
@@ -9,6 +9,7 @@
 * [Remove explicit dependency on ActiveRecord][#64]
   ([@flash-gordon][])
 
+[v0.4.0]: https://github.com/mcmire/super_diff/tree/v0.4.0
 [#64]: https://github.com/mcmire/super_diff/pull/64
 [@flash-gordon]: https://github.com/flash-gordon
 
diff --git a/gemfiles/no_rails.gemfile.lock b/gemfiles/no_rails.gemfile.lock
index e8e949d0..0645d8f3 100644
--- a/gemfiles/no_rails.gemfile.lock
+++ b/gemfiles/no_rails.gemfile.lock
@@ -30,7 +30,7 @@ GIT
 PATH
   remote: ..
   specs:
-    super_diff (0.3.0)
+    super_diff (0.4.0)
       attr_extras
       diff-lcs
       patience_diff
diff --git a/gemfiles/rails_5_0.gemfile.lock b/gemfiles/rails_5_0.gemfile.lock
index befc174f..323d316e 100644
--- a/gemfiles/rails_5_0.gemfile.lock
+++ b/gemfiles/rails_5_0.gemfile.lock
@@ -30,7 +30,7 @@ GIT
 PATH
   remote: ..
   specs:
-    super_diff (0.3.0)
+    super_diff (0.4.0)
       attr_extras
       diff-lcs
       patience_diff
@@ -55,7 +55,7 @@ GEM
       thor (>= 0.14.0)
     arel (7.1.4)
     ast (2.4.0)
-    attr_extras (6.2.1)
+    attr_extras (6.2.2)
     byebug (11.0.1)
     childprocess (2.0.0)
       rake (< 13.0)
diff --git a/gemfiles/rails_5_1.gemfile.lock b/gemfiles/rails_5_1.gemfile.lock
index d8cf5d7a..615dfe19 100644
--- a/gemfiles/rails_5_1.gemfile.lock
+++ b/gemfiles/rails_5_1.gemfile.lock
@@ -30,7 +30,7 @@ GIT
 PATH
   remote: ..
   specs:
-    super_diff (0.3.0)
+    super_diff (0.4.0)
       attr_extras
       diff-lcs
       patience_diff
@@ -55,7 +55,7 @@ GEM
       thor (>= 0.14.0)
     arel (8.0.0)
     ast (2.4.0)
-    attr_extras (6.2.1)
+    attr_extras (6.2.2)
     byebug (11.0.1)
     childprocess (2.0.0)
       rake (< 13.0)
diff --git a/gemfiles/rails_5_2.gemfile.lock b/gemfiles/rails_5_2.gemfile.lock
index fbe4c2cd..f869e852 100644
--- a/gemfiles/rails_5_2.gemfile.lock
+++ b/gemfiles/rails_5_2.gemfile.lock
@@ -30,7 +30,7 @@ GIT
 PATH
   remote: ..
   specs:
-    super_diff (0.3.0)
+    super_diff (0.4.0)
       attr_extras
       diff-lcs
       patience_diff
@@ -55,7 +55,7 @@ GEM
       thor (>= 0.14.0)
     arel (9.0.0)
     ast (2.4.0)
-    attr_extras (6.2.1)
+    attr_extras (6.2.2)
     byebug (11.0.1)
     childprocess (2.0.0)
       rake (< 13.0)
diff --git a/gemfiles/rails_6_0.gemfile.lock b/gemfiles/rails_6_0.gemfile.lock
index d4987065..7032ee97 100644
--- a/gemfiles/rails_6_0.gemfile.lock
+++ b/gemfiles/rails_6_0.gemfile.lock
@@ -30,7 +30,7 @@ GIT
 PATH
   remote: ..
   specs:
-    super_diff (0.3.0)
+    super_diff (0.4.0)
       attr_extras
       diff-lcs
       patience_diff
@@ -54,7 +54,7 @@ GEM
       rake
       thor (>= 0.14.0)
     ast (2.4.0)
-    attr_extras (6.2.1)
+    attr_extras (6.2.2)
     byebug (11.0.1)
     childprocess (2.0.0)
       rake (< 13.0)
diff --git a/lib/super_diff/version.rb b/lib/super_diff/version.rb
index 7cbae7e7..1cfa19db 100644
--- a/lib/super_diff/version.rb
+++ b/lib/super_diff/version.rb
@@ -1,3 +1,3 @@
 module SuperDiff
-  VERSION = "0.3.0".freeze
+  VERSION = "0.4.0".freeze
 end