diff --git a/nucypher/blockchain/eth/domains.py b/nucypher/blockchain/eth/domains.py
index f31f75033..a21988178 100644
--- a/nucypher/blockchain/eth/domains.py
+++ b/nucypher/blockchain/eth/domains.py
@@ -20,7 +20,7 @@ class EthChain(ChainInfo, Enum):
 
 class PolygonChain(ChainInfo, Enum):
     MAINNET = (137, "polygon")
-    MUMBAI = (80001, "mumbai")
+    AMOY = (80002, "amoy")
 
 
 class TACoDomain:
@@ -83,11 +83,11 @@ MAINNET = TACoDomain(
 LYNX = TACoDomain(
     name="lynx",
     eth_chain=EthChain.SEPOLIA,
-    polygon_chain=PolygonChain.MUMBAI,
+    polygon_chain=PolygonChain.AMOY,
     condition_chains=(
         EthChain.MAINNET,
         EthChain.SEPOLIA,
-        PolygonChain.MUMBAI,
+        PolygonChain.AMOY,
         PolygonChain.MAINNET,
     ),
 )
@@ -95,8 +95,8 @@ LYNX = TACoDomain(
 TAPIR = TACoDomain(
     name="tapir",
     eth_chain=EthChain.SEPOLIA,
-    polygon_chain=PolygonChain.MUMBAI,
-    condition_chains=(EthChain.SEPOLIA, PolygonChain.MUMBAI),
+    polygon_chain=PolygonChain.AMOY,
+    condition_chains=(EthChain.SEPOLIA, PolygonChain.AMOY),
 )
 
 
diff --git a/tests/unit/test_taco_domains.py b/tests/unit/test_taco_domains.py
index 19f08bdbb..ccccfe87d 100644
--- a/tests/unit/test_taco_domains.py
+++ b/tests/unit/test_taco_domains.py
@@ -36,7 +36,7 @@ def test_eth_chains(eth_chain_test):
     "poly_chain_test",
     (
         (PolygonChain.MAINNET, "polygon", 137),
-        (PolygonChain.MUMBAI, "mumbai", 80001),
+        (PolygonChain.AMOY, "amoy", 80002),
     ),
 )
 def test_polygon_chains(poly_chain_test):
@@ -59,11 +59,11 @@ def test_polygon_chains(poly_chain_test):
             domains.LYNX,
             "lynx",
             EthChain.SEPOLIA,
-            PolygonChain.MUMBAI,
+            PolygonChain.AMOY,
             (
                 EthChain.MAINNET,
                 EthChain.SEPOLIA,
-                PolygonChain.MUMBAI,
+                PolygonChain.AMOY,
                 PolygonChain.MAINNET,
             ),
         ),
@@ -71,8 +71,8 @@ def test_polygon_chains(poly_chain_test):
             domains.TAPIR,
             "tapir",
             EthChain.SEPOLIA,
-            PolygonChain.MUMBAI,
-            (EthChain.SEPOLIA, PolygonChain.MUMBAI),
+            PolygonChain.AMOY,
+            (EthChain.SEPOLIA, PolygonChain.AMOY),
         ),
     ),
 )