diff --git a/ruby/gilded_rose.rb b/ruby/gilded_rose.rb
index 0e50f84a..d6f5c52c 100644
--- a/ruby/gilded_rose.rb
+++ b/ruby/gilded_rose.rb
@@ -37,6 +37,15 @@ class GildedRose
         quality: self.regular_quality_limit(next_quality)
       }
     end,
+    "Conjured Mana Cake" => Proc.new do |sell_in:, quality:|
+      next_sell_in = sell_in -1
+      {
+        sell_in: next_sell_in,
+        quality: self.regular_quality_limit(
+          quality + (next_sell_in < 0 ? -4 : -2)
+        )
+      }
+    end,
   }
 
   def self.regular_quality_limit(unsanitized_quality)
diff --git a/ruby/gilded_rose_spec.rb b/ruby/gilded_rose_spec.rb
index 7c0303f8..4ba4af08 100644
--- a/ruby/gilded_rose_spec.rb
+++ b/ruby/gilded_rose_spec.rb
@@ -122,6 +122,30 @@ describe GildedRose do
       expect(items[0].sell_in).to eq 1 # does not change
       expect(items[0].quality).to eq 80 # always 80
     end
+
+    it "degrades conjured cake quickly" do
+      items = [Item.new("Conjured Mana Cake", 2, 9)]
+      updater = GildedRose.new(items)
+      updater.update_quality()
+
+      expect(items[0].sell_in).to eq 1
+      expect(items[0].quality).to eq 7 # degrades twice as fast
+
+      updater.update_quality()
+
+      expect(items[0].sell_in).to eq 0
+      expect(items[0].quality).to eq 5 # still above zero
+
+      updater.update_quality()
+
+      expect(items[0].sell_in).to eq -1
+      expect(items[0].quality).to eq 1 # still above zero
+
+      updater.update_quality()
+
+      expect(items[0].sell_in).to eq -2
+      expect(items[0].quality).to eq 0 # does not go below zero
+    end
   end
 
 end