diff --git a/CHANGELOG.md b/CHANGELOG.md
index ba2b7a9..7980c97 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## master (unreleased)
+## 0.4.0
 
 - Support passing a range to the count: option, by calling the case
   equality operator on the argument.
diff --git a/lib/db_query_matchers/version.rb b/lib/db_query_matchers/version.rb
index 89bd3ce..b6b3dd4 100644
--- a/lib/db_query_matchers/version.rb
+++ b/lib/db_query_matchers/version.rb
@@ -1,4 +1,4 @@
 # Defines the gem version.
 module DBQueryMatchers
-  VERSION = '0.3.1'
+  VERSION = '0.4.0'
 end