diff --git a/shard.yml b/shard.yml
index f435d90..674d7b3 100644
--- a/shard.yml
+++ b/shard.yml
@@ -1,5 +1,5 @@
 name: carbon_sendgrid_adapter
-version: 0.3.0
+version: 0.4.0
 
 authors:
   - Matthew McGarvey <matthewmcgarvey14@gmail.com>
diff --git a/src/carbon_sendgrid_adapter.cr b/src/carbon_sendgrid_adapter.cr
index 80401ba..2fd9881 100644
--- a/src/carbon_sendgrid_adapter.cr
+++ b/src/carbon_sendgrid_adapter.cr
@@ -5,7 +5,7 @@ require "./errors"
 require "./carbon_sendgrid_extensions"
 
 class Carbon::SendGridAdapter < Carbon::Adapter
-  VERSION = "0.3.0"
+  VERSION = "0.4.0"
   private getter api_key : String
   private getter? sandbox : Bool