diff --git a/lib/enumerize/activemodel.rb b/lib/enumerize/activemodel.rb
index b57a043..7f2ad16 100644
--- a/lib/enumerize/activemodel.rb
+++ b/lib/enumerize/activemodel.rb
@@ -50,6 +50,20 @@ def deserialize(value)
           @attr.find_value(value)
         end
       end
+
+      def cast(value)
+        case value
+        when nil
+          return super
+        when Array
+          if @attr.arguments[:multiple]
+            found = @attr.find_values(*value)
+            return found.presence || super
+          end
+        end
+
+        @attr.find_value(value) || value
+      end
     end
   end
 end
diff --git a/test/activemodel_test.rb b/test/activemodel_test.rb
index b2c2e52..4056bec 100644
--- a/test/activemodel_test.rb
+++ b/test/activemodel_test.rb
@@ -183,6 +183,58 @@ class InterestsRequiredActiveModelUser < ActiveModelUser
       expect(deserialized.map(&:to_s)).must_equal ['music', 'programming']
     end
   end
+
+  describe 'Type#cast' do
+    it 'casts single valid value to Enumerize::Value' do
+      type = model.attribute_types['sex']
+      result = type.cast('male')
+      expect(result).must_be_instance_of Enumerize::Value
+      expect(result.to_s).must_equal 'male'
+    end
+
+    it 'returns nil for nil single value' do
+      type = model.attribute_types['sex']
+      result = type.cast(nil)
+      expect(result).must_be_nil
+    end
+
+    it 'returns original value for invalid single value' do
+      type = model.attribute_types['sex']
+      result = type.cast('invalid')
+      expect(result).must_equal 'invalid'
+    end
+
+    it 'casts array of valid values for multiple attribute' do
+      type = model.attribute_types['interests']
+      result = type.cast(['music', 'sports'])
+      expect(result).must_be_instance_of Array
+      expect(result.map(&:to_s)).must_equal ['music', 'sports']
+    end
+
+    it 'returns empty array as-is for multiple attribute' do
+      type = model.attribute_types['interests']
+      result = type.cast([])
+      expect(result).must_equal []
+    end
+
+    it 'filters out invalid values when at least one is valid' do
+      type = model.attribute_types['interests']
+      result = type.cast(['music', 'invalid', 'sports'])
+      expect(result.map(&:to_s)).must_equal ['music', 'sports']
+    end
+
+    it 'returns array as-is when all values are invalid for multiple attribute' do
+      type = model.attribute_types['interests']
+      result = type.cast(['invalid1', 'invalid2'])
+      expect(result).must_equal ['invalid1', 'invalid2']
+    end
+
+    it 'returns nil for nil value on multiple attribute' do
+      type = model.attribute_types['interests']
+      result = type.cast(nil)
+      expect(result).must_be_nil
+    end
+  end
 end
 
 else