diff --git a/master/custom/builders.py b/master/custom/builders.py
index fdb8c805..696b84d3 100644
--- a/master/custom/builders.py
+++ b/master/custom/builders.py
@@ -410,7 +410,6 @@ def get_builder_tier(builder: str) -> str:
 # Match builder name (excluding the branch name) of builders that should only
 # run on the main and PR branches.
 ONLY_MAIN_BRANCH = (
-    "ARM64 Windows",
     "Windows PGO",
     "AMD64 Arch Linux Perf",
     "AMD64 Arch Linux Valgrind",
diff --git a/master/custom/workers.py b/master/custom/workers.py
index efc9b2a4..35114b62 100644
--- a/master/custom/workers.py
+++ b/master/custom/workers.py
@@ -298,7 +298,8 @@ def get_workers(settings):
         cpw(
             name="ware-win11-arm64",
             tags=['windows', 'win11', 'arm64'],
-            parallel_tests=2,
+            parallel_tests=8,
+            not_branches=['3.10', '3.11', '3.12'],
         ),
         cpw(
             name="bcannon-wasi",