diff --git a/infra/specs/internal.client.webrtc.json b/infra/specs/internal.client.webrtc.json
index 36a7c627d2..0e3336d5ca 100644
--- a/infra/specs/internal.client.webrtc.json
+++ b/infra/specs/internal.client.webrtc.json
@@ -28,7 +28,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "named_caches": [
@@ -67,7 +67,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "named_caches": [
@@ -107,7 +107,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "hard_timeout": 7200,
@@ -149,7 +149,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "named_caches": [
@@ -189,7 +189,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "named_caches": [
@@ -228,7 +228,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "named_caches": [
@@ -267,7 +267,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "named_caches": [
@@ -306,7 +306,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "named_caches": [
@@ -345,7 +345,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "named_caches": [
@@ -384,7 +384,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "named_caches": [
@@ -481,7 +481,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "named_caches": [
@@ -520,7 +520,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "named_caches": [
@@ -560,7 +560,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "hard_timeout": 7200,
@@ -602,7 +602,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "named_caches": [
@@ -642,7 +642,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "named_caches": [
@@ -681,7 +681,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "named_caches": [
@@ -720,7 +720,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "named_caches": [
@@ -759,7 +759,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "named_caches": [
@@ -798,7 +798,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "named_caches": [
@@ -837,7 +837,7 @@
             }
           ],
           "dimensions": {
-            "os": "iOS-17.6.1",
+            "os": "iOS-18",
             "pool": "chrome.tests"
           },
           "named_caches": [
diff --git a/infra/specs/mixins.pyl b/infra/specs/mixins.pyl
index ca6d38e0c9..3bba887503 100644
--- a/infra/specs/mixins.pyl
+++ b/infra/specs/mixins.pyl
@@ -66,10 +66,10 @@
       'has_native_resultdb_integration': True
     }
   },
-  'ios-device-17': {
+  'ios-device-18': {
     'swarming': {
       'dimensions': {
-        'os': 'iOS-17.6.1',
+        'os': 'iOS-18',
         'pool': 'chrome.tests'
       }
     }
diff --git a/infra/specs/mixins_webrtc.pyl b/infra/specs/mixins_webrtc.pyl
index 32c1ad00bd..c9fcc40948 100644
--- a/infra/specs/mixins_webrtc.pyl
+++ b/infra/specs/mixins_webrtc.pyl
@@ -45,10 +45,10 @@
       '--test-arg=--undefok=test_launcher_summary_output'
     ],
   },
-  'ios-device-17': {
+  'ios-device-18': {
     'swarming': {
       'dimensions': {
-        'os': 'iOS-17.6.1',
+        'os': 'iOS-18',
         'pool': 'chrome.tests',
       }
     }
diff --git a/infra/specs/waterfalls.pyl b/infra/specs/waterfalls.pyl
index 2e6c5c02e3..dacac43947 100644
--- a/infra/specs/waterfalls.pyl
+++ b/infra/specs/waterfalls.pyl
@@ -322,7 +322,7 @@
     'machines': {
       'iOS64 Debug': {
         'mixins': [
-          'ios-device-17', 'webrtc-xctest', 'chrome-tester-service-account',
+          'ios-device-18', 'webrtc-xctest', 'chrome-tester-service-account',
           'xcode_15_main', 'mac_toolchain', 'has_native_resultdb_integration',
           'out_dir_arg'
         ],
@@ -345,7 +345,7 @@
       },
       'iOS64 Release': {
         'mixins': [
-          'ios-device-17', 'webrtc-xctest', 'chrome-tester-service-account',
+          'ios-device-18', 'webrtc-xctest', 'chrome-tester-service-account',
           'xcode_15_main', 'mac_toolchain', 'has_native_resultdb_integration',
           'out_dir_arg'
         ],