diff --git a/tools/clang/scripts/update.py b/tools/clang/scripts/update.py
index 82f9c4f..20c4147 100755
--- a/tools/clang/scripts/update.py
+++ b/tools/clang/scripts/update.py
@@ -35,11 +35,11 @@
 # https://chromium.googlesource.com/chromium/src/+/main/docs/updating_clang.md
 # Reverting problematic clang rolls is safe, though.
 # This is the output of `git describe` and is usable as a commit-ish.
-CLANG_REVISION = 'llvmorg-17-init-16420-g0c545a44'
-CLANG_SUB_REVISION = 8
+CLANG_REVISION = 'llvmorg-18-init-4631-gd50b56d1'
+CLANG_SUB_REVISION = 1
 
 PACKAGE_VERSION = '%s-%s' % (CLANG_REVISION, CLANG_SUB_REVISION)
-RELEASE_VERSION = '17'
+RELEASE_VERSION = '18'
 # TODO(crbug.com/1467585): Bump to 18 in next Clang roll.
 
 CDS_URL = os.environ.get('CDS_CLANG_BUCKET_OVERRIDE',