diff --git a/DEPS b/DEPS
index 9bd2981520791e..7a1f34f2210a36 100644
--- a/DEPS
+++ b/DEPS
@@ -288,7 +288,7 @@ vars = {
   # Also, if you change these, make sure you update the svn_revisions in
   # //buildtools/deps_revisions.gni.
   'clang_format_revision': '96636aa0e9f047f17447f2d45a094d0b59ed7917',
-  'libcxx_revision': '9009625c821e9580bfece732c25bac1cc9c5a7c2',
+  'libcxx_revision': '4daecde1d737da594173591db71e543a3e2d51d8',
   'libcxxabi_revision': '0d529660e32d77d9111912d73f2c74fc5fa2a858',
   'libunwind_revision': '69d9b84cca8354117b9fe9705a4430d789ee599b',
 }
diff --git a/buildtools/DEPS b/buildtools/DEPS
index 5cda9180201793..4decb8945a0c36 100644
--- a/buildtools/DEPS
+++ b/buildtools/DEPS
@@ -18,7 +18,7 @@ vars = {
 
   # When changing these, also update the svn revisions in deps_revisions.gni
   'clang_format_revision': '96636aa0e9f047f17447f2d45a094d0b59ed7917',
-  'libcxx_revision':       '9009625c821e9580bfece732c25bac1cc9c5a7c2',
+  'libcxx_revision':       '4daecde1d737da594173591db71e543a3e2d51d8',
   'libcxxabi_revision':    '0d529660e32d77d9111912d73f2c74fc5fa2a858',
   'libunwind_revision':    '69d9b84cca8354117b9fe9705a4430d789ee599b',
 }
diff --git a/buildtools/deps_revisions.gni b/buildtools/deps_revisions.gni
index 0222020f375ee3..9e705a303dcc90 100644
--- a/buildtools/deps_revisions.gni
+++ b/buildtools/deps_revisions.gni
@@ -5,5 +5,5 @@
 declare_args() {
   # The libc++ svn revision that belongs to the git hash in DEPS. Used to cause
   # full rebuilds on libc++ rolls.
-  libcxx_svn_revision = "356574"
+  libcxx_svn_revision = "356640"
 }