diff --git a/CHANGELOG.md b/CHANGELOG.md
index a836a9c4..1cfdd871 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
 ## Next Release
 
+## 4.0.0
+
 * Stop requiring `set` before bundler can select the proper version. This could result in
   `already defined constant` warnings during boot (#659).
 * Require Ruby 2.7.
diff --git a/lib/spring/version.rb b/lib/spring/version.rb
index d5ae86c9..6b93ff99 100644
--- a/lib/spring/version.rb
+++ b/lib/spring/version.rb
@@ -1,3 +1,3 @@
 module Spring
-  VERSION = "3.1.1"
+  VERSION = "4.0.0"
 end