diff --git a/utils/bazel/llvm-project-overlay/clang/BUILD.bazel b/utils/bazel/llvm-project-overlay/clang/BUILD.bazel
--- a/utils/bazel/llvm-project-overlay/clang/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/clang/BUILD.bazel
@@ -1378,7 +1378,7 @@
         "lib/Driver",
     ],
     linkopts = select({
-        "@bazel_tools//src/conditions:windows": ["version.lib"],
+        "@platforms//os:windows": ["version.lib"],
         "//conditions:default": [],
     }),
     textual_hdrs = glob([
@@ -1881,7 +1881,7 @@
     ]),
     hdrs = glob(["include/clang-c/*.h"]),
     copts = select({
-        "@bazel_tools//src/conditions:windows": ["-D_CINDEX_LIB_"],
+        "@platforms//os:windows": ["-D_CINDEX_LIB_"],
         "//conditions:default": [],
     }),
     strip_include_prefix = "include",
@@ -1970,7 +1970,7 @@
     testonly = 1,
     srcs = ["tools/c-arcmt-test/c-arcmt-test.c"],
     copts = select({
-        "@bazel_tools//src/conditions:windows": [],
+        "@platforms//os:windows": [],
         "//conditions:default": ["-std=gnu99"],
     }),
     stamp = 0,
diff --git a/utils/bazel/llvm-project-overlay/clang/unittests/BUILD.bazel b/utils/bazel/llvm-project-overlay/clang/unittests/BUILD.bazel
--- a/utils/bazel/llvm-project-overlay/clang/unittests/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/clang/unittests/BUILD.bazel
@@ -531,7 +531,7 @@
         "libclang/TestUtils.h",
     ],
     args = select({
-        "@bazel_tools//src/conditions:windows": [
+        "@platforms//os:windows": [
             # Need to disable the VFS tests that don't use Windows friendly
             # paths. These are also disabled on Windows in the CMake build.
             "--gtest_filter=-*VirtualFileOverlay*",
diff --git a/utils/bazel/llvm-project-overlay/llvm/BUILD.bazel b/utils/bazel/llvm-project-overlay/llvm/BUILD.bazel
--- a/utils/bazel/llvm-project-overlay/llvm/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/llvm/BUILD.bazel
@@ -191,7 +191,7 @@
         # To avoid a dependency cycle.
         "include/llvm/Option/*.h",
     ]) + select({
-        "@bazel_tools//src/conditions:windows": glob([
+        "@platforms//os:windows": glob([
             "lib/Support/Windows/*.h",
             "lib/Support/Windows/*.inc",
         ]),
@@ -255,8 +255,8 @@
     }),
     includes = ["include"],
     linkopts = select({
-        "@bazel_tools//src/conditions:windows": [],
-        "@bazel_tools//src/conditions:freebsd": [
+        "@platforms//os:windows": [],
+        "@platforms//os:freebsd": [
             "-pthread",
             "-lexecinfo",
             "-ldl",
@@ -1124,7 +1124,7 @@
         "lib/TargetParser/*.cpp",
         "lib/TargetParser/*.h",
     ]) + select({
-        "@bazel_tools//src/conditions:windows": glob([
+        "@platforms//os:windows": glob([
             "lib/TargetParser/Windows/*.h",
             "lib/TargetParser/Windows/*.inc",
         ]),
@@ -2105,7 +2105,7 @@
         # MSVC isn't happy with long string literals, while other compilers
         # which support them get significant compile time improvements with
         # them enabled. Ideally this flag would only be enabled on Windows via
-        # a select() on `@bazel_tools//src/conditions:windows,`, but that would
+        # a select() on `@platforms//os:windows,`, but that would
         # require refactoring gentbl from a macro into a rule.
         # TODO(#92): Refactor gentbl to support this use
         tblgen_args = "--long-string-literals=0",
@@ -2581,9 +2581,9 @@
     copts = llvm_copts,
     linkopts = select({
         "@platforms//os:android": [],
-        "@bazel_tools//src/conditions:windows": [],
-        "@bazel_tools//src/conditions:freebsd": [],
-        "@bazel_tools//src/conditions:darwin": [],
+        "@platforms//os:windows": [],
+        "@platforms//os:freebsd": [],
+        "@platforms//os:macos": [],
         "//conditions:default": [
             "-lrt",
         ],
@@ -2647,9 +2647,9 @@
     copts = llvm_copts,
     linkopts = select({
         "@platforms//os:android": [],
-        "@bazel_tools//src/conditions:windows": [],
-        "@bazel_tools//src/conditions:freebsd": [],
-        "@bazel_tools//src/conditions:darwin": [],
+        "@platforms//os:windows": [],
+        "@platforms//os:freebsd": [],
+        "@platforms//os:macos": [],
         "//conditions:default": [
             "-lrt",
         ],
@@ -3012,8 +3012,8 @@
     # ll scripts rely on symbols from dependent
     # libraries being resolvable.
     linkopts = select({
-        "@bazel_tools//src/conditions:windows": [],
-        "@bazel_tools//src/conditions:darwin": [],
+        "@platforms//os:windows": [],
+        "@platforms//os:macos": [],
         "//conditions:default": [
             "-Wl,--undefined=_ZTIi",
             "-Wl,--export-dynamic-symbol=_ZTIi",
@@ -3521,8 +3521,8 @@
     copts = llvm_copts,
     # Make symbols from the standard library dynamically resolvable.
     linkopts = select({
-        "@bazel_tools//src/conditions:windows": [],
-        "@bazel_tools//src/conditions:darwin": [],
+        "@platforms//os:windows": [],
+        "@platforms//os:macos": [],
         "//conditions:default": [
             "-Wl,--undefined=_ZTIi",
             "-Wl,--export-dynamic-symbol=_ZTIi",
@@ -4471,8 +4471,8 @@
     ]),
     copts = llvm_copts,
     linkopts = select({
-        "@bazel_tools//src/conditions:windows": [],
-        "@bazel_tools//src/conditions:darwin": [],
+        "@platforms//os:windows": [],
+        "@platforms//os:macos": [],
         "//conditions:default": ["-Wl,--export-dynamic"],
     }),
     stamp = 0,
@@ -4701,8 +4701,8 @@
     # isn't even used in the main binary, so we also need to force it
     # to be included.
     linkopts = select({
-        "@bazel_tools//src/conditions:windows": [],
-        "@bazel_tools//src/conditions:darwin": [],
+        "@platforms//os:windows": [],
+        "@platforms//os:macos": [],
         "//conditions:default": [
             "-rdynamic",
             "-u_ZTIi",
diff --git a/utils/bazel/llvm-project-overlay/llvm/cc_plugin_library.bzl b/utils/bazel/llvm-project-overlay/llvm/cc_plugin_library.bzl
--- a/utils/bazel/llvm-project-overlay/llvm/cc_plugin_library.bzl
+++ b/utils/bazel/llvm-project-overlay/llvm/cc_plugin_library.bzl
@@ -43,8 +43,8 @@
     native.filegroup(
         name = interface_output_name,
         srcs = select({
-            "@bazel_tools//src/conditions:windows": [":" + dll_name],
-            "@bazel_tools//src/conditions:darwin": [":" + dylib_name],
+            "@platforms//os:windows": [":" + dll_name],
+            "@platforms//os:macos": [":" + dylib_name],
             "//conditions:default": [":" + so_name],
         }),
         output_group = "interface_library",
@@ -53,8 +53,8 @@
         name = import_name,
         interface_library = ":" + interface_output_name,
         shared_library = select({
-            "@bazel_tools//src/conditions:windows": ":" + dll_name,
-            "@bazel_tools//src/conditions:darwin": ":" + dylib_name,
+            "@platforms//os:windows": ":" + dll_name,
+            "@platforms//os:macos": ":" + dylib_name,
             "//conditions:default": ":" + so_name,
         }),
         alwayslink = alwayslink,
diff --git a/utils/bazel/llvm-project-overlay/third-party/unittest/BUILD.bazel b/utils/bazel/llvm-project-overlay/third-party/unittest/BUILD.bazel
--- a/utils/bazel/llvm-project-overlay/third-party/unittest/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/third-party/unittest/BUILD.bazel
@@ -58,7 +58,7 @@
         "__STDC_LIMIT_MACROS",
         "__STDC_CONSTANT_MACROS",
     ] + select({
-        "@bazel_tools//src/conditions:windows": ["GTEST_USE_OWN_TR1_TUPLE=0"],
+        "@platforms//os:windows": ["GTEST_USE_OWN_TR1_TUPLE=0"],
         "//conditions:default": ["GTEST_USE_OWN_TR1_TUPLE=1"],
     }),
     includes = [
diff --git a/utils/bazel/vulkan_sdk.bzl b/utils/bazel/vulkan_sdk.bzl
--- a/utils/bazel/vulkan_sdk.bzl
+++ b/utils/bazel/vulkan_sdk.bzl
@@ -19,7 +19,7 @@
 cc_library(
     name = "sdk",
     srcs = select({
-        "@bazel_tools//src/conditions:windows": [
+        "@platforms//os:windows": [
             "vulkan-sdk/Lib/vulkan-1.lib"
         ],
         "//conditions:default": [