diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 25917dae..d9ebb27c 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,4 +1,4 @@
-4.0.0pre4 [2020-11-23]
+4.0.0 [2021-04-18]
 ------------------
  - now requires at least Thunderbird 78
  - fixed incompatibility with Thunderbird 78 (#199)
diff --git a/manifest.json b/manifest.json
index e5fc449a..befedee0 100644
--- a/manifest.json
+++ b/manifest.json
@@ -2,7 +2,7 @@
 	"manifest_version": 2,
 	"name": "__MSG_about_name__",
 	"description": "__MSG_about_summary__",
-	"version": "4.0.0pre4",
+	"version": "4.0.0",
 	"author": "Philippe Lieser",
 	"homepage_url": "https://github.com/lieser/dkim_verifier/wiki",
 	"default_locale": "en_US",