diff --git a/clang-tools-extra/unittests/clang-tidy/ClangTidyTest.h b/clang-tools-extra/unittests/clang-tidy/ClangTidyTest.h
--- a/clang-tools-extra/unittests/clang-tidy/ClangTidyTest.h
+++ b/clang-tools-extra/unittests/clang-tidy/ClangTidyTest.h
@@ -110,7 +110,7 @@
     Args.push_back("-fobjc-arc");
   }
   if (extension == ".cc" || extension == ".cpp" || extension == ".mm") {
-    Args.push_back("-std=c++11");
+    Args.push_back("-std=c++20");
   }
   Args.push_back("-Iinclude");
   Args.insert(Args.end(), ExtraArgs.begin(), ExtraArgs.end());