diff --git a/CHANGELOG.md b/CHANGELOG.md
index e6b92b76f..261cfb9ed 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,8 @@
 ChangeLog
 =========
 
-4.0.0-alpha3 (????-??-??)
--------------------------
+4.0.0-beta1 (2015-12-02)
+------------------------
 
 * #258: Support for expanding events that use `RDATE`. (@jabdoa2)
 * #258: Correctly support TZID for events that use `RDATE`. (@jabdoa2)
diff --git a/lib/Version.php b/lib/Version.php
index ea5778271..32c42dd18 100644
--- a/lib/Version.php
+++ b/lib/Version.php
@@ -14,6 +14,6 @@ class Version {
     /**
      * Full version number.
      */
-    const VERSION = '4.0.0-alpha3';
+    const VERSION = '4.0.0-beta1';
 
 }