diff --git a/Gemfile.lock b/Gemfile.lock
index 5fad4af..b345639 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    mime_actor (0.3.3)
+    mime_actor (0.4.0)
       actionpack (>= 5.0)
       activesupport (>= 5.0)
       rake (>= 11.0)
diff --git a/lib/mime_actor/version.rb b/lib/mime_actor/version.rb
index 6ff085b..35fbc28 100644
--- a/lib/mime_actor/version.rb
+++ b/lib/mime_actor/version.rb
@@ -11,8 +11,8 @@ def self.gem_version
 
   module VERSION
     MAJOR = 0
-    MINOR = 3
-    BUILD = 3
+    MINOR = 4
+    BUILD = 0
     PRE   = nil
 
     STRING = [MAJOR, MINOR, BUILD, PRE].compact.join(".")