diff --git a/infra/config/global/generated/cr-buildbucket.cfg b/infra/config/global/generated/cr-buildbucket.cfg
index c1a709cdf1..3a4e486f72 100644
--- a/infra/config/global/generated/cr-buildbucket.cfg
+++ b/infra/config/global/generated/cr-buildbucket.cfg
@@ -27,6 +27,10 @@ buckets {
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "dawn-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -48,6 +52,10 @@ buckets {
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "dawn-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -69,6 +77,10 @@ buckets {
         properties_j: "target_cpu:\"x86\""
       }
       service_account: "dawn-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -90,6 +102,10 @@ buckets {
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "dawn-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -111,6 +127,10 @@ buckets {
         properties_j: "target_cpu:\"x86\""
       }
       service_account: "dawn-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -136,6 +156,10 @@ buckets {
         path: "osx_sdk"
       }
       service_account: "dawn-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -161,6 +185,10 @@ buckets {
         path: "osx_sdk"
       }
       service_account: "dawn-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -186,6 +214,10 @@ buckets {
         path: "win_toolchain"
       }
       service_account: "dawn-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -211,6 +243,10 @@ buckets {
         path: "win_toolchain"
       }
       service_account: "dawn-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -236,6 +272,10 @@ buckets {
         path: "win_toolchain"
       }
       service_account: "dawn-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -261,6 +301,10 @@ buckets {
         path: "win_toolchain"
       }
       service_account: "dawn-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -281,6 +325,10 @@ buckets {
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "dawn-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -301,6 +349,10 @@ buckets {
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "dawn-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -339,6 +391,10 @@ buckets {
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "dawn-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -361,6 +417,10 @@ buckets {
         properties_j: "target_cpu:\"x86\""
       }
       service_account: "dawn-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -383,6 +443,10 @@ buckets {
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "dawn-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -405,6 +469,10 @@ buckets {
         properties_j: "target_cpu:\"x86\""
       }
       service_account: "dawn-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -431,6 +499,10 @@ buckets {
         path: "osx_sdk"
       }
       service_account: "dawn-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -457,6 +529,10 @@ buckets {
         path: "osx_sdk"
       }
       service_account: "dawn-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -477,6 +553,10 @@ buckets {
         properties_j: "runhooks:true"
       }
       service_account: "dawn-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -503,6 +583,10 @@ buckets {
         path: "win_toolchain"
       }
       service_account: "dawn-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -529,6 +613,10 @@ buckets {
         path: "win_toolchain"
       }
       service_account: "dawn-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -555,6 +643,10 @@ buckets {
         path: "win_toolchain"
       }
       service_account: "dawn-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -581,6 +673,10 @@ buckets {
         path: "win_toolchain"
       }
       service_account: "dawn-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -602,6 +698,10 @@ buckets {
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "dawn-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
@@ -623,6 +723,10 @@ buckets {
         properties_j: "target_cpu:\"x64\""
       }
       service_account: "dawn-try-builder@chops-service-accounts.iam.gserviceaccount.com"
+      experiments {
+        key: "luci.recipes.use_python3"
+        value: 100
+      }
       experiments {
         key: "luci.use_realms"
         value: 100
diff --git a/infra/config/global/generated/project.cfg b/infra/config/global/generated/project.cfg
index 8b7946f04c..425a291586 100644
--- a/infra/config/global/generated/project.cfg
+++ b/infra/config/global/generated/project.cfg
@@ -6,3 +6,9 @@
 
 name: "dawn"
 access: "group:all"
+lucicfg {
+  version: "1.29.1"
+  package_dir: ".."
+  config_dir: "generated"
+  entry_point: "main.star"
+}
diff --git a/infra/config/global/main.star b/infra/config/global/main.star
index 4b150f8949..26084c2813 100755
--- a/infra/config/global/main.star
+++ b/infra/config/global/main.star
@@ -10,7 +10,10 @@ main.star: lucicfg configuration for Dawn's standalone builers.
 
 # Enable realms experiment.
 lucicfg.enable_experiment("crbug.com/1085650")
-luci.builder.defaults.experiments.set({"luci.use_realms": 100})
+luci.builder.defaults.experiments.set({
+    "luci.use_realms": 100,
+    "luci.recipes.use_python3": 100,
+})
 
 lucicfg.config(fail_on_warnings = True)