Update bazel toolchain version.
diff --git a/bazel/grpc_deps.bzl b/bazel/grpc_deps.bzl
index e465312..47d3308 100644
--- a/bazel/grpc_deps.bzl
+++ b/bazel/grpc_deps.bzl
@@ -120,10 +120,10 @@
     if "com_github_bazelbuild_bazeltoolchains" not in native.existing_rules():
         native.http_archive(
             name = "com_github_bazelbuild_bazeltoolchains",
-            strip_prefix = "bazel-toolchains-af4681c3d19f063f090222ec3d04108c4e0ca255",
+            strip_prefix = "bazel-toolchains-f3b09700fae5d7b6e659d7cefe0dcc6e8498504c",
             urls = [
-                "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/archive/af4681c3d19f063f090222ec3d04108c4e0ca255.tar.gz",
-                "https://github.com/bazelbuild/bazel-toolchains/archive/af4681c3d19f063f090222ec3d04108c4e0ca255.tar.gz",
+                "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/archive/f3b09700fae5d7b6e659d7cefe0dcc6e8498504c.tar.gz",
+                "https://github.com/bazelbuild/bazel-toolchains/archive/f3b09700fae5d7b6e659d7cefe0dcc6e8498504c.tar.gz",
             ],
-            sha256 = "d58bb2d6c8603f600d522b6104d6192a65339aa26cbba9f11ff5c4b36dedb928",
+            sha256 = "ed829b5eea8af1f405f4cc3d6ecfc3b1365bb7843171036030a31b5127002311",
         )