diff --git a/common.gypi b/common.gypi
index 18bde8e9d0f2b7..32ceb385180688 100644
--- a/common.gypi
+++ b/common.gypi
@@ -34,7 +34,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.54',
+    'v8_embedder_string': '-node.55',
 
     ##### V8 defaults for Node.js #####
 
diff --git a/deps/v8/test/cctest/BUILD.gn b/deps/v8/test/cctest/BUILD.gn
index 1a527073450fac..8acd2e50f3edff 100644
--- a/deps/v8/test/cctest/BUILD.gn
+++ b/deps/v8/test/cctest/BUILD.gn
@@ -63,6 +63,12 @@ v8_header_set("cctest_headers") {
   ]
 }
 
+config("cctest_sources_config") {
+  if (is_clang) {
+    cflags = [ "-Wno-string-concatenation" ]
+  }
+}
+
 v8_source_set("cctest_sources") {
   testonly = true
 
@@ -376,6 +382,7 @@ v8_source_set("cctest_sources") {
   configs = [
     "../..:external_config",
     "../..:internal_config_base",
+    ":cctest_sources_config",
   ]
 
   public_deps = [