diff --git a/tools_webrtc/ios/tryserver.webrtc/ios32_sim_ios9_dbg.json b/tools_webrtc/ios/tryserver.webrtc/ios32_sim_ios9_dbg.json
index 242df5ff3d..a82cfead56 100644
--- a/tools_webrtc/ios/tryserver.webrtc/ios32_sim_ios9_dbg.json
+++ b/tools_webrtc/ios/tryserver.webrtc/ios32_sim_ios9_dbg.json
@@ -2,7 +2,7 @@
   "comments": [
     "Tests for 32-bit iOS simulators."
   ],
-  "xcode version": "9.0",
+  "xcode build version": "9C40b",
   "gn_args": [
     "goma_dir=\"$(goma_dir)\"",
     "is_component_build=false",
diff --git a/tools_webrtc/ios/tryserver.webrtc/ios64_sim_ios10_dbg.json b/tools_webrtc/ios/tryserver.webrtc/ios64_sim_ios10_dbg.json
index a902cc1429..28f96201fc 100644
--- a/tools_webrtc/ios/tryserver.webrtc/ios64_sim_ios10_dbg.json
+++ b/tools_webrtc/ios/tryserver.webrtc/ios64_sim_ios10_dbg.json
@@ -2,7 +2,7 @@
   "comments": [
     "Tests for 64-bit iOS simulators."
   ],
-  "xcode version": "9.0",
+  "xcode build version": "9C40b",
   "gn_args": [
     "goma_dir=\"$(goma_dir)\"",
     "is_component_build=false",
diff --git a/tools_webrtc/ios/tryserver.webrtc/ios64_sim_ios11_dbg.json b/tools_webrtc/ios/tryserver.webrtc/ios64_sim_ios11_dbg.json
index 6804a60d2e..4a2ad07d8e 100644
--- a/tools_webrtc/ios/tryserver.webrtc/ios64_sim_ios11_dbg.json
+++ b/tools_webrtc/ios/tryserver.webrtc/ios64_sim_ios11_dbg.json
@@ -2,7 +2,7 @@
   "comments": [
     "Tests for 64-bit iOS simulators."
   ],
-  "xcode version": "9.0",
+  "xcode build version": "9C40b",
   "gn_args": [
     "goma_dir=\"$(goma_dir)\"",
     "is_component_build=false",
diff --git a/tools_webrtc/ios/tryserver.webrtc/ios64_sim_ios9_dbg.json b/tools_webrtc/ios/tryserver.webrtc/ios64_sim_ios9_dbg.json
index 25eadbec03..4c1af2d3bd 100644
--- a/tools_webrtc/ios/tryserver.webrtc/ios64_sim_ios9_dbg.json
+++ b/tools_webrtc/ios/tryserver.webrtc/ios64_sim_ios9_dbg.json
@@ -2,7 +2,7 @@
   "comments": [
     "Tests for 64-bit iOS simulators."
   ],
-  "xcode version": "9.0",
+  "xcode build version": "9C40b",
   "gn_args": [
     "goma_dir=\"$(goma_dir)\"",
     "is_component_build=false",
diff --git a/tools_webrtc/ios/tryserver.webrtc/ios_arm64_dbg.json b/tools_webrtc/ios/tryserver.webrtc/ios_arm64_dbg.json
index f3e2e213ec..a718b7acad 100644
--- a/tools_webrtc/ios/tryserver.webrtc/ios_arm64_dbg.json
+++ b/tools_webrtc/ios/tryserver.webrtc/ios_arm64_dbg.json
@@ -2,7 +2,7 @@
   "comments": [
     "Builder for 64-bit devices."
   ],
-  "xcode version": "9.0",
+  "xcode build version": "9C40b",
   "gn_args": [
     "goma_dir=\"$(goma_dir)\"",
     "ios_enable_code_signing=false",
diff --git a/tools_webrtc/ios/tryserver.webrtc/ios_arm64_rel.json b/tools_webrtc/ios/tryserver.webrtc/ios_arm64_rel.json
index fd6572d136..7d2f923b57 100644
--- a/tools_webrtc/ios/tryserver.webrtc/ios_arm64_rel.json
+++ b/tools_webrtc/ios/tryserver.webrtc/ios_arm64_rel.json
@@ -2,7 +2,7 @@
   "comments": [
     "Builder for 64-bit devices."
   ],
-  "xcode version": "9.0",
+  "xcode build version": "9C40b",
   "gn_args": [
     "goma_dir=\"$(goma_dir)\"",
     "dcheck_always_on=true",
diff --git a/tools_webrtc/ios/tryserver.webrtc/ios_dbg.json b/tools_webrtc/ios/tryserver.webrtc/ios_dbg.json
index 6807db2f62..4c5aca5ef7 100644
--- a/tools_webrtc/ios/tryserver.webrtc/ios_dbg.json
+++ b/tools_webrtc/ios/tryserver.webrtc/ios_dbg.json
@@ -2,7 +2,7 @@
   "comments": [
     "Builder for 32-bit devices."
   ],
-  "xcode version": "9.0",
+  "xcode build version": "9C40b",
   "gn_args": [
     "goma_dir=\"$(goma_dir)\"",
     "ios_enable_code_signing=false",
diff --git a/tools_webrtc/ios/tryserver.webrtc/ios_rel.json b/tools_webrtc/ios/tryserver.webrtc/ios_rel.json
index f3fa1017d6..81c16db60a 100644
--- a/tools_webrtc/ios/tryserver.webrtc/ios_rel.json
+++ b/tools_webrtc/ios/tryserver.webrtc/ios_rel.json
@@ -2,7 +2,7 @@
   "comments": [
     "Builder for 32-bit devices."
   ],
-  "xcode version": "9.0",
+  "xcode build version": "9C40b",
   "gn_args": [
     "goma_dir=\"$(goma_dir)\"",
     "dcheck_always_on=true",