diff --git a/libcxx/include/__config b/libcxx/include/__config
index 9759d3b9e8e0..a5670d0848fe 100644
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -40,7 +40,7 @@
 // _LIBCPP_VERSION represents the version of libc++, which matches the version of LLVM.
 // Given a LLVM release LLVM XX.YY.ZZ (e.g. LLVM 17.0.1 == 17.00.01), _LIBCPP_VERSION is
 // defined to XXYYZZ.
-#  define _LIBCPP_VERSION 170000
+#  define _LIBCPP_VERSION 180000
 
 #  define _LIBCPP_CONCAT_IMPL(_X, _Y) _X##_Y
 #  define _LIBCPP_CONCAT(_X, _Y) _LIBCPP_CONCAT_IMPL(_X, _Y)
diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
index 1a9ad06bdf8b..f566a2ef43e3 100644
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -9,7 +9,7 @@ include(${LLVM_COMMON_CMAKE_UTILS}/Modules/CMakePolicy.cmake
 set(CMAKE_BUILD_WITH_INSTALL_NAME_DIR ON)
 
 if(NOT DEFINED LLVM_VERSION_MAJOR)
-  set(LLVM_VERSION_MAJOR 17)
+  set(LLVM_VERSION_MAJOR 18)
 endif()
 if(NOT DEFINED LLVM_VERSION_MINOR)
   set(LLVM_VERSION_MINOR 0)
diff --git a/llvm/utils/gn/secondary/llvm/version.gni b/llvm/utils/gn/secondary/llvm/version.gni
index 33f40ec8c153..f11375917661 100644
--- a/llvm/utils/gn/secondary/llvm/version.gni
+++ b/llvm/utils/gn/secondary/llvm/version.gni
@@ -1,4 +1,4 @@
-llvm_version_major = 17
+llvm_version_major = 18
 llvm_version_minor = 0
 llvm_version_patch = 0
 llvm_version = "$llvm_version_major.$llvm_version_minor.$llvm_version_patch"
diff --git a/llvm/utils/lit/lit/__init__.py b/llvm/utils/lit/lit/__init__.py
index a90e103d8a1a..1eea0887f1d1 100644
--- a/llvm/utils/lit/lit/__init__.py
+++ b/llvm/utils/lit/lit/__init__.py
@@ -2,7 +2,7 @@
 
 __author__ = "Daniel Dunbar"
 __email__ = "daniel@minormatter.com"
-__versioninfo__ = (17, 0, 0)
+__versioninfo__ = (18, 0, 0)
 __version__ = ".".join(str(v) for v in __versioninfo__) + "dev"
 
 __all__ = []