diff --git a/DEPS b/DEPS
index e75a8bb..86f522d 100644
--- a/DEPS
+++ b/DEPS
@@ -152,7 +152,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling partition_allocator
   # and whatever else without interference from each other.
-  'partition_allocator_revision': '9e9b9fe53bdcdebca5472e2cc143b2eb933e7aa2',
+  'partition_allocator_revision': 'f91d5ba232cbe61b9740b4101a5b5bea3cd631ed',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling pdfium_tests
   # and whatever else without interference from each other.
diff --git a/build_overrides/BUILDCONFIG.gn b/build_overrides/BUILDCONFIG.gn
index 2b9bbd6..d5ced94 100644
--- a/build_overrides/BUILDCONFIG.gn
+++ b/build_overrides/BUILDCONFIG.gn
@@ -369,6 +369,10 @@
   ]
 }
 
+if (is_apple) {
+  default_compiler_configs += [ "//build/config/compiler:enable_arc2" ]
+}
+
 if (is_posix) {
   if (current_os != "aix") {
     default_compiler_configs +=
diff --git a/testing/unit_test_main.cpp b/testing/unit_test_main.cpp
index fb0bed2..30d4203 100644
--- a/testing/unit_test_main.cpp
+++ b/testing/unit_test_main.cpp
@@ -29,7 +29,7 @@
       allocator_shim::EnableMemoryTagging(false),
       allocator_shim::SplitMainPartition(true),
       allocator_shim::UseDedicatedAlignedPartition(true), 0,
-      allocator_shim::AlternateBucketDistribution::kDefault);
+      allocator_shim::BucketDistribution::kNeutral);
 #endif  // BUILDFLAG(USE_PARTITION_ALLOC_AS_MALLOC)
 #endif  // defined(PDF_USE_PARTITION_ALLOC)