diff --git a/lib/schemable/definition.rb b/lib/schemable/definition.rb
index 7a202f7..e90a9f6 100644
--- a/lib/schemable/definition.rb
+++ b/lib/schemable/definition.rb
@@ -2,8 +2,8 @@ module Schemable
   class Definition
     attr_reader :configuration
 
-    def initialize(configuration)
-      @configuration = configuration
+    def initialize
+      @configuration = Schemable.configuration
     end
 
     def serializer
diff --git a/sig/schemable/definition.rbs b/sig/schemable/definition.rbs
index cb29332..bc06f3c 100644
--- a/sig/schemable/definition.rbs
+++ b/sig/schemable/definition.rbs
@@ -3,7 +3,7 @@ module Schemable
     attr_accessor configuration: Configuration
 
     # Initializes the definition with the configuration.
-    def initialize: (Configuration) -> void
+    def initialize: -> void
 
     # Returns the attributes that are nullable in the request/response body. This means that they can be present in the request/response body but they can be null.
     # They are not required to be present in the request body.