diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp
--- a/clang/lib/Frontend/InitPreprocessor.cpp
+++ b/clang/lib/Frontend/InitPreprocessor.cpp
@@ -561,10 +561,13 @@
     Builder.defineMacro("__cpp_unicode_literals", "200710L");
     Builder.defineMacro("__cpp_user_defined_literals", "200809L");
     Builder.defineMacro("__cpp_lambdas", "200907L");
-    Builder.defineMacro("__cpp_constexpr",
-                        LangOpts.CPlusPlus20 ? "201907L" :
-                        LangOpts.CPlusPlus17 ? "201603L" :
-                        LangOpts.CPlusPlus14 ? "201304L" : "200704");
+    Builder.defineMacro("__cpp_constexpr", LangOpts.CPlusPlus20
+                                               ? "202110L"
+                                               : LangOpts.CPlusPlus17
+                                                     ? "201603L"
+                                                     : LangOpts.CPlusPlus14
+                                                           ? "201304L"
+                                                           : "200704");
     Builder.defineMacro("__cpp_constexpr_in_decltype", "201711L");
     Builder.defineMacro("__cpp_range_based_for",
                         LangOpts.CPlusPlus17 ? "201603L" : "200907");
diff --git a/clang/test/Lexer/cxx-features.cpp b/clang/test/Lexer/cxx-features.cpp
--- a/clang/test/Lexer/cxx-features.cpp
+++ b/clang/test/Lexer/cxx-features.cpp
@@ -277,7 +277,7 @@
 #error "wrong value for __cpp_lambdas"
 #endif
 
-#if check(constexpr, 0, 200704, 201304, 201603, 201907, 201907)
+#if check(constexpr, 0, 200704, 201304, 201603, 202110L, 202110L)
 #error "wrong value for __cpp_constexpr"
 #endif