diff --git a/python/gilded_rose.py b/python/gilded_rose.py
index 4dd24099..393764c4 100755
--- a/python/gilded_rose.py
+++ b/python/gilded_rose.py
@@ -3,6 +3,7 @@
 AGED_BRIE = "Aged Brie"
 BACKSTAGE_PASS = "Backstage passes to a TAFKAL80ETC concert"
 SULFURAS = "Sulfuras, Hand of Ragnaros"
+CONJURED_PREFIX = "Conjured"
 
 MIN_QUALITY = 0
 MAX_QUALITY = 50
@@ -71,17 +72,29 @@ class SulfurasUpdater(ItemUpdater):
         pass
 
 
+class ConjuredUpdater(ItemUpdater):
+    """Degrades twice as fast as an ordinary item."""
+
+    def _quality_delta(self, item):
+        return 2 * super()._quality_delta(item)
+
+
 _UPDATERS_BY_NAME = {
     AGED_BRIE: AgedBrieUpdater(),
     BACKSTAGE_PASS: BackstagePassUpdater(),
     SULFURAS: SulfurasUpdater(),
 }
+_CONJURED_UPDATER = ConjuredUpdater()
 _DEFAULT_UPDATER = ItemUpdater()
 
 
 def updater_for(item):
     """Pick the rule set that applies to an item. Updaters are stateless."""
-    return _UPDATERS_BY_NAME.get(item.name, _DEFAULT_UPDATER)
+    if item.name in _UPDATERS_BY_NAME:
+        return _UPDATERS_BY_NAME[item.name]
+    if item.name.startswith(CONJURED_PREFIX):
+        return _CONJURED_UPDATER
+    return _DEFAULT_UPDATER
 
 
 class Item:
diff --git a/python/tests/approved_files/test_gilded_rose_approvals.test_gilded_rose_approvals.approved.txt b/python/tests/approved_files/test_gilded_rose_approvals.test_gilded_rose_approvals.approved.txt
index a04e48ac..4e7237ff 100644
--- a/python/tests/approved_files/test_gilded_rose_approvals.test_gilded_rose_approvals.approved.txt
+++ b/python/tests/approved_files/test_gilded_rose_approvals.test_gilded_rose_approvals.approved.txt
@@ -21,7 +21,7 @@ Sulfuras, Hand of Ragnaros, -1, 80
 Backstage passes to a TAFKAL80ETC concert, 14, 21
 Backstage passes to a TAFKAL80ETC concert, 9, 50
 Backstage passes to a TAFKAL80ETC concert, 4, 50
-Conjured Mana Cake, 2, 5
+Conjured Mana Cake, 2, 4
 
 -------- day 2 --------
 name, sellIn, quality
@@ -33,7 +33,7 @@ Sulfuras, Hand of Ragnaros, -1, 80
 Backstage passes to a TAFKAL80ETC concert, 13, 22
 Backstage passes to a TAFKAL80ETC concert, 8, 50
 Backstage passes to a TAFKAL80ETC concert, 3, 50
-Conjured Mana Cake, 1, 4
+Conjured Mana Cake, 1, 2
 
 -------- day 3 --------
 name, sellIn, quality
@@ -45,7 +45,7 @@ Sulfuras, Hand of Ragnaros, -1, 80
 Backstage passes to a TAFKAL80ETC concert, 12, 23
 Backstage passes to a TAFKAL80ETC concert, 7, 50
 Backstage passes to a TAFKAL80ETC concert, 2, 50
-Conjured Mana Cake, 0, 3
+Conjured Mana Cake, 0, 0
 
 -------- day 4 --------
 name, sellIn, quality
@@ -57,7 +57,7 @@ Sulfuras, Hand of Ragnaros, -1, 80
 Backstage passes to a TAFKAL80ETC concert, 11, 24
 Backstage passes to a TAFKAL80ETC concert, 6, 50
 Backstage passes to a TAFKAL80ETC concert, 1, 50
-Conjured Mana Cake, -1, 1
+Conjured Mana Cake, -1, 0
 
 -------- day 5 --------
 name, sellIn, quality
diff --git a/python/tests/test_gilded_rose.py b/python/tests/test_gilded_rose.py
index b1e6877e..f95c078a 100644
--- a/python/tests/test_gilded_rose.py
+++ b/python/tests/test_gilded_rose.py
@@ -12,6 +12,7 @@ from gilded_rose import GildedRose, Item
 AGED_BRIE = "Aged Brie"
 SULFURAS = "Sulfuras, Hand of Ragnaros"
 BACKSTAGE_PASS = "Backstage passes to a TAFKAL80ETC concert"
+CONJURED_CAKE = "Conjured Mana Cake"
 
 
 def update(name, sell_in, quality):
@@ -81,12 +82,29 @@ class TestBackstagePasses:
         assert quality == 0
 
 
+class TestConjuredItem:
+    def test_quality_degrades_twice_as_fast_as_a_normal_item(self):
+        assert update(CONJURED_CAKE, 3, 6) == (2, 4)
+
+    def test_quality_degrades_four_per_day_once_sell_by_date_has_passed(self):
+        assert update(CONJURED_CAKE, 0, 6) == (-1, 2)
+
+    @pytest.mark.parametrize("sell_in, quality", [(3, 1), (0, 3), (-2, 0)])
+    def test_quality_is_never_negative(self, sell_in, quality):
+        _, new_quality = update(CONJURED_CAKE, sell_in, quality)
+        assert new_quality == 0
+
+    def test_any_item_whose_name_starts_with_conjured_is_conjured(self):
+        assert update("Conjured +5 Dexterity Vest", 10, 20) == (9, 18)
+
+
 def test_all_items_in_the_inventory_are_updated():
     items = [
         Item("+5 Dexterity Vest", 10, 20),
         Item(AGED_BRIE, 2, 0),
         Item(SULFURAS, 0, 80),
         Item(BACKSTAGE_PASS, 5, 20),
+        Item(CONJURED_CAKE, 3, 6),
     ]
     GildedRose(items).update_quality()
     assert [(i.sell_in, i.quality) for i in items] == [
@@ -94,6 +112,7 @@ def test_all_items_in_the_inventory_are_updated():
         (1, 1),
         (0, 80),
         (4, 23),
+        (2, 4),
     ]