Index: libcxx/include/version
===================================================================
--- libcxx/include/version
+++ libcxx/include/version
@@ -120,7 +120,7 @@
 __cpp_lib_parallel_algorithm                            201603L <algorithm> <numeric>
 __cpp_lib_polymorphic_allocator                         201902L <memory>
 __cpp_lib_quoted_string_io                              201304L <iomanip>
-__cpp_lib_ranges                                        201811L <algorithm> <functional> <iterator>
+__cpp_lib_ranges                                        201911L <algorithm> <functional> <iterator>
                                                                 <memory> <ranges>
 __cpp_lib_raw_memory_algorithms                         201606L <memory>
 __cpp_lib_remove_cvref                                  201711L <type_traits>
@@ -337,7 +337,7 @@
 #   define __cpp_lib_math_constants                     201907L
 # endif
 // # define __cpp_lib_polymorphic_allocator                201902L
-// # define __cpp_lib_ranges                               201811L
+// # define __cpp_lib_ranges                               201911L
 # define __cpp_lib_remove_cvref                         201711L
 # if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore)
 #   define __cpp_lib_semaphore                          201907L
Index: libcxx/test/std/language.support/support.limits/support.limits.general/iterator.version.pass.cpp
===================================================================
--- libcxx/test/std/language.support/support.limits/support.limits.general/iterator.version.pass.cpp
+++ libcxx/test/std/language.support/support.limits/support.limits.general/iterator.version.pass.cpp
@@ -22,7 +22,7 @@
     __cpp_lib_make_reverse_iterator         201402L [C++14]
     __cpp_lib_nonmember_container_access    201411L [C++17]
     __cpp_lib_null_iterators                201304L [C++14]
-    __cpp_lib_ranges                        201811L [C++20]
+    __cpp_lib_ranges                        201911L [C++20]
     __cpp_lib_ssize                         201902L [C++20]
 */
 
@@ -178,8 +178,8 @@
 #   ifndef __cpp_lib_ranges
 #     error "__cpp_lib_ranges should be defined in c++20"
 #   endif
-#   if __cpp_lib_ranges != 201811L
-#     error "__cpp_lib_ranges should have the value 201811L in c++20"
+#   if __cpp_lib_ranges != 201911L
+#     error "__cpp_lib_ranges should have the value 201911L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_ranges
@@ -235,8 +235,8 @@
 #   ifndef __cpp_lib_ranges
 #     error "__cpp_lib_ranges should be defined in c++2b"
 #   endif
-#   if __cpp_lib_ranges != 201811L
-#     error "__cpp_lib_ranges should have the value 201811L in c++2b"
+#   if __cpp_lib_ranges != 201911L
+#     error "__cpp_lib_ranges should have the value 201911L in c++2b"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_ranges
Index: libcxx/test/std/language.support/support.limits/support.limits.general/ranges.version.pass.cpp
===================================================================
--- libcxx/test/std/language.support/support.limits/support.limits.general/ranges.version.pass.cpp
+++ libcxx/test/std/language.support/support.limits/support.limits.general/ranges.version.pass.cpp
@@ -18,7 +18,7 @@
 // Test the feature test macros defined by <ranges>
 
 /*  Constant            Value
-    __cpp_lib_ranges    201811L [C++20]
+    __cpp_lib_ranges    201911L [C++20]
 */
 
 #include <ranges>
@@ -48,8 +48,8 @@
 #   ifndef __cpp_lib_ranges
 #     error "__cpp_lib_ranges should be defined in c++20"
 #   endif
-#   if __cpp_lib_ranges != 201811L
-#     error "__cpp_lib_ranges should have the value 201811L in c++20"
+#   if __cpp_lib_ranges != 201911L
+#     error "__cpp_lib_ranges should have the value 201911L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_ranges
@@ -63,8 +63,8 @@
 #   ifndef __cpp_lib_ranges
 #     error "__cpp_lib_ranges should be defined in c++2b"
 #   endif
-#   if __cpp_lib_ranges != 201811L
-#     error "__cpp_lib_ranges should have the value 201811L in c++2b"
+#   if __cpp_lib_ranges != 201911L
+#     error "__cpp_lib_ranges should have the value 201911L in c++2b"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_ranges
Index: libcxx/test/std/language.support/support.limits/support.limits.general/version.version.pass.cpp
===================================================================
--- libcxx/test/std/language.support/support.limits/support.limits.general/version.version.pass.cpp
+++ libcxx/test/std/language.support/support.limits/support.limits.general/version.version.pass.cpp
@@ -111,7 +111,7 @@
     __cpp_lib_parallel_algorithm                   201603L [C++17]
     __cpp_lib_polymorphic_allocator                201902L [C++20]
     __cpp_lib_quoted_string_io                     201304L [C++14]
-    __cpp_lib_ranges                               201811L [C++20]
+    __cpp_lib_ranges                               201911L [C++20]
     __cpp_lib_raw_memory_algorithms                201606L [C++17]
     __cpp_lib_remove_cvref                         201711L [C++20]
     __cpp_lib_result_of_sfinae                     201210L [C++14]
@@ -2923,8 +2923,8 @@
 #   ifndef __cpp_lib_ranges
 #     error "__cpp_lib_ranges should be defined in c++20"
 #   endif
-#   if __cpp_lib_ranges != 201811L
-#     error "__cpp_lib_ranges should have the value 201811L in c++20"
+#   if __cpp_lib_ranges != 201911L
+#     error "__cpp_lib_ranges should have the value 201911L in c++20"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_ranges
@@ -4077,8 +4077,8 @@
 #   ifndef __cpp_lib_ranges
 #     error "__cpp_lib_ranges should be defined in c++2b"
 #   endif
-#   if __cpp_lib_ranges != 201811L
-#     error "__cpp_lib_ranges should have the value 201811L in c++2b"
+#   if __cpp_lib_ranges != 201911L
+#     error "__cpp_lib_ranges should have the value 201911L in c++2b"
 #   endif
 # else // _LIBCPP_VERSION
 #   ifdef __cpp_lib_ranges
Index: libcxx/utils/generate_feature_test_macro_components.py
===================================================================
--- libcxx/utils/generate_feature_test_macro_components.py
+++ libcxx/utils/generate_feature_test_macro_components.py
@@ -489,7 +489,7 @@
     "headers": ["iomanip"],
   }, {
     "name": "__cpp_lib_ranges",
-    "values": { "c++20": 201811 },
+    "values": { "c++20": 201911 },
     "headers": ["algorithm", "functional", "iterator", "memory", "ranges"],
     "unimplemented": True,
   }, {