diff --git a/History.txt b/History.txt
index f82599c0..71a1ab1f 100644
--- a/History.txt
+++ b/History.txt
@@ -1,3 +1,13 @@
+== 0.4.0 2018-05-19
+
+* [MIGHT BREAK THINGS] changes to the way keys are looked up #55
+  Previously, keys that were not explicitly mentioned but already present in
+  the key chain for one of the recipient addresses would have been used
+  silently. This is no longer the case, if the :keys option is given, all
+  necessary keys have to be specified as either key data, key id, fingerprint
+  or GPGME::Key object.
+* fix error when calling encrypt with actual key objects #60
+
 == 0.3.3 2018-04-01
 
 * fix broken GpgmeHelper#keys_for_data #59
diff --git a/lib/mail/gpg/version.rb b/lib/mail/gpg/version.rb
index e536b82b..206fc502 100644
--- a/lib/mail/gpg/version.rb
+++ b/lib/mail/gpg/version.rb
@@ -1,5 +1,5 @@
 module Mail
   module Gpg
-    VERSION = "0.3.3"
+    VERSION = "0.4.0"
   end
 end