diff --git a/index.js b/index.js
index 8e5e333..1940df3 100644
--- a/index.js
+++ b/index.js
@@ -259,9 +259,6 @@ function extensiveDeepEqualByType(leftHandOperand, rightHandOperand, leftHandTyp
       return leftHandOperand.equals(rightHandOperand);
     case 'Temporal.Duration':
       return leftHandOperand.total('nanoseconds') === rightHandOperand.total('nanoseconds');
-    case 'Temporal.TimeZone':
-    case 'Temporal.Calendar':
-      return leftHandOperand.toString() === rightHandOperand.toString();
     default:
       return objectEqual(leftHandOperand, rightHandOperand, options);
   }
diff --git a/package-lock.json b/package-lock.json
index 5ca6fec..074da45 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,7 @@
       "version": "0.0.0-development",
       "license": "MIT",
       "devDependencies": {
-        "@js-temporal/polyfill": "^0.4.3",
+        "@js-temporal/polyfill": "^0.5.1",
         "@rollup/plugin-commonjs": "^24.1.0",
         "@web/test-runner": "^0.16.1",
         "benchmark": "^2.1.0",
@@ -228,13 +228,12 @@
       }
     },
     "node_modules/@js-temporal/polyfill": {
-      "version": "0.4.3",
-      "resolved": "https://registry.npmjs.org/@js-temporal/polyfill/-/polyfill-0.4.3.tgz",
-      "integrity": "sha512-6Fmjo/HlkyVCmJzAPnvtEWlcbQUSRhi8qlN9EtJA/wP7FqXsevLLrlojR44kzNzrRkpf7eDJ+z7b4xQD/Ycypw==",
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/@js-temporal/polyfill/-/polyfill-0.5.1.tgz",
+      "integrity": "sha512-hloP58zRVCRSpgDxmqCWJNlizAlUgJFqG2ypq79DCvyv9tHjRYMDOcPFjzfl/A1/YxDvRCZz8wvZvmapQnKwFQ==",
       "dev": true,
       "dependencies": {
-        "jsbi": "^4.1.0",
-        "tslib": "^2.3.1"
+        "jsbi": "^4.3.0"
       },
       "engines": {
         "node": ">=12"
@@ -6914,12 +6913,6 @@
       "integrity": "sha512-N3WMsuqV66lT30CrXNbEjx4GEwlow3v6rr4mCcv6prnfwhS01rkgyFdjPNBYd9br7LpXV1+Emh01fHnq2Gdgrw==",
       "dev": true
     },
-    "node_modules/tslib": {
-      "version": "2.4.1",
-      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.4.1.tgz",
-      "integrity": "sha512-tGyy4dAjRIEwI7BzsB0lynWgOpfqjUdq91XXAlIWD2OwKBH7oCl/GZG/HT4BOHrTlPMOASlMQ7veyTqpmRcrNA==",
-      "dev": true
-    },
     "node_modules/tsscmp": {
       "version": "1.0.6",
       "resolved": "https://registry.npmjs.org/tsscmp/-/tsscmp-1.0.6.tgz",
diff --git a/package.json b/package.json
index 745064d..eae915e 100644
--- a/package.json
+++ b/package.json
@@ -52,7 +52,7 @@
     }
   },
   "devDependencies": {
-    "@js-temporal/polyfill": "^0.4.3",
+    "@js-temporal/polyfill": "^0.5.1",
     "@rollup/plugin-commonjs": "^24.1.0",
     "@web/test-runner": "^0.16.1",
     "benchmark": "^2.1.0",
diff --git a/test/temporal-types.js b/test/temporal-types.js
index 6489945..bb2c3f1 100644
--- a/test/temporal-types.js
+++ b/test/temporal-types.js
@@ -106,28 +106,4 @@ describe('TC39 Temporal', function () {
         'eql(new Temporal.Duration(0, 0, 0, 1), new Temporal.Duration(0, 0, 0, 2)) === false');
     });
   });
-
-  describe('Temporal.TimeZone', function () {
-    it('returns true for same time zones', function () {
-      assert(eql(new Temporal.TimeZone('+01:00'), new Temporal.TimeZone('+01:00')),
-        'eql(new Temporal.TimeZone("+01:00"), new Temporal.TimeZone("+01:00"))');
-    });
-
-    it('returns false for different time zones', function () {
-      assert(eql(new Temporal.TimeZone('+01:00'), new Temporal.TimeZone('+02:00')) === false,
-        'eql(new Temporal.TimeZone("+01:00"), new Temporal.TimeZone("+02:00")) === false');
-    });
-  });
-
-  describe('Temporal.Calendar', function () {
-    it('returns true for same calendars', function () {
-      assert(eql(new Temporal.Calendar('gregory'), new Temporal.Calendar('gregory')),
-        'eql(new Temporal.Calendar("gregory"), new Temporal.Calendar("gregory"))');
-    });
-
-    it('returns false for different calendars', function () {
-      assert(eql(new Temporal.Calendar('gregory'), new Temporal.Calendar('iso8601')) === false,
-        'eql(new Temporal.Calendar("gregory"), new Temporal.Calendar("iso8601")) === false');
-    });
-  });
 });