diff --git a/WORKSPACE.bzlmod b/WORKSPACE.bzlmod
index 1472fbe55b..c2116759df 100644
--- a/WORKSPACE.bzlmod
+++ b/WORKSPACE.bzlmod
@@ -18,9 +18,9 @@ http_archive(
 
 http_archive(
     name = "com_grail_bazel_toolchain",
-    sha256 = "a9fc7cf01d0ea0a935bd9e3674dd3103766db77dfc6aafcb447a7ddd6ca24a78",
-    strip_prefix = "toolchains_llvm-c65ef7a45907016a754e5bf5bfabac76eb702fd3",
-    urls = ["https://github.com/bazel-contrib/toolchains_llvm/archive/c65ef7a45907016a754e5bf5bfabac76eb702fd3.tar.gz"],
+    sha256 = "c54ad27d7f32da305bcd9313790beab0d55763892937ca90db3babe3c40db738",
+    strip_prefix = "toolchains_llvm-421aa20ce5e1686752c60e155a80785c206dd0ac",
+    urls = ["https://github.com/bazel-contrib/toolchains_llvm/archive/421aa20ce5e1686752c60e155a80785c206dd0ac.tar.gz"],
 )
 
 _SYSROOT_LINUX_BUILD_FILE = """
diff --git a/js/private/dev_deps.bzl b/js/private/dev_deps.bzl
index b280908bb7..3fd0ae8723 100644
--- a/js/private/dev_deps.bzl
+++ b/js/private/dev_deps.bzl
@@ -62,9 +62,9 @@ def rules_js_dev_dependencies():
 
     http_archive(
         name = "com_grail_bazel_toolchain",
-        sha256 = "a9fc7cf01d0ea0a935bd9e3674dd3103766db77dfc6aafcb447a7ddd6ca24a78",
-        strip_prefix = "toolchains_llvm-c65ef7a45907016a754e5bf5bfabac76eb702fd3",
-        urls = ["https://github.com/bazel-contrib/toolchains_llvm/archive/c65ef7a45907016a754e5bf5bfabac76eb702fd3.tar.gz"],
+        sha256 = "c54ad27d7f32da305bcd9313790beab0d55763892937ca90db3babe3c40db738",
+        strip_prefix = "toolchains_llvm-421aa20ce5e1686752c60e155a80785c206dd0ac",
+        urls = ["https://github.com/bazel-contrib/toolchains_llvm/archive/421aa20ce5e1686752c60e155a80785c206dd0ac.tar.gz"],
     )
 
     http_archive(