diff --git a/CMakeLists.txt b/CMakeLists.txt
index 781076ef61..51e2f7d77d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -137,9 +137,9 @@ else()
     set(ZIG_SYSTEM_LIBCXX "stdc++" CACHE STRING "system libcxx name for build.zig")
 endif()
 
-find_package(llvm 18)
-find_package(clang 18)
-find_package(lld 18)
+find_package(llvm 19)
+find_package(clang 19)
+find_package(lld 19)
 
 if(ZIG_STATIC_ZLIB)
     if (MSVC)
diff --git a/cmake/Findclang.cmake b/cmake/Findclang.cmake
index c21fe18837..6dbe13eccd 100644
--- a/cmake/Findclang.cmake
+++ b/cmake/Findclang.cmake
@@ -17,10 +17,10 @@ find_path(CLANG_INCLUDE_DIRS NAMES clang/Frontend/ASTUnit.h
 if(${LLVM_LINK_MODE} STREQUAL "shared")
   find_library(CLANG_LIBRARIES
     NAMES
-      libclang-cpp.so.18
-      libclang-cpp.so.18.1
-      clang-cpp-18.0
-      clang-cpp180
+      libclang-cpp.so.19
+      libclang-cpp.so.19.1
+      clang-cpp-19.0
+      clang-cpp190
       clang-cpp
     NAMES_PER_DIR
     HINTS "${LLVM_LIBDIRS}"
@@ -68,6 +68,7 @@ else()
   FIND_AND_ADD_CLANG_LIB(clangToolingCore)
   FIND_AND_ADD_CLANG_LIB(clangExtractAPI)
   FIND_AND_ADD_CLANG_LIB(clangSupport)
+  FIND_AND_ADD_CLANG_LIB(clangInstallAPI)
 endif()
 
 if (MSVC)
diff --git a/cmake/Findlld.cmake b/cmake/Findlld.cmake
index abe29b5fce..7c86aaed07 100644
--- a/cmake/Findlld.cmake
+++ b/cmake/Findlld.cmake
@@ -9,21 +9,21 @@
 find_path(LLD_INCLUDE_DIRS NAMES lld/Common/Driver.h
     HINTS ${LLVM_INCLUDE_DIRS}
     PATHS
-        /usr/lib/llvm-18/include
-        /usr/local/llvm180/include
-        /usr/local/llvm18/include
-        /usr/local/opt/llvm@18/include
-        /opt/homebrew/opt/llvm@18/include
+        /usr/lib/llvm-19/include
+        /usr/local/llvm190/include
+        /usr/local/llvm19/include
+        /usr/local/opt/llvm@19/include
+        /opt/homebrew/opt/llvm@19/include
         /mingw64/include)
 
-find_library(LLD_LIBRARY NAMES lld-18.0 lld180 lld NAMES_PER_DIR
+find_library(LLD_LIBRARY NAMES lld-19.0 lld190 lld NAMES_PER_DIR
     HINTS ${LLVM_LIBDIRS}
     PATHS
-        /usr/lib/llvm-18/lib
-        /usr/local/llvm180/lib
-        /usr/local/llvm18/lib
-        /usr/local/opt/llvm@18/lib
-        /opt/homebrew/opt/llvm@18/lib
+        /usr/lib/llvm-19/lib
+        /usr/local/llvm190/lib
+        /usr/local/llvm19/lib
+        /usr/local/opt/llvm@19/lib
+        /opt/homebrew/opt/llvm@19/lib
 )
 if(EXISTS ${LLD_LIBRARY})
     set(LLD_LIBRARIES ${LLD_LIBRARY})
@@ -34,11 +34,11 @@ else()
             HINTS ${LLVM_LIBDIRS}
             PATHS
                 ${LLD_LIBDIRS}
-                /usr/lib/llvm-18/lib
-                /usr/local/llvm180/lib
-                /usr/local/llvm18/lib
-                /usr/local/opt/llvm@18/lib
-                /opt/homebrew/opt/llvm@18/lib
+                /usr/lib/llvm-19/lib
+                /usr/local/llvm190/lib
+                /usr/local/llvm19/lib
+                /usr/local/opt/llvm@19/lib
+                /opt/homebrew/opt/llvm@19/lib
                 /mingw64/lib
                 /c/msys64/mingw64/lib
                 c:/msys64/mingw64/lib)
diff --git a/cmake/Findllvm.cmake b/cmake/Findllvm.cmake
index c4eb49fe76..16a429fd28 100644
--- a/cmake/Findllvm.cmake
+++ b/cmake/Findllvm.cmake
@@ -17,12 +17,12 @@ if(ZIG_USE_LLVM_CONFIG)
     # terminate when the right LLVM version is not found.
     unset(LLVM_CONFIG_EXE CACHE)
     find_program(LLVM_CONFIG_EXE
-        NAMES llvm-config-18 llvm-config-18.0 llvm-config180 llvm-config18 llvm-config NAMES_PER_DIR
+        NAMES llvm-config-19 llvm-config-19.0 llvm-config190 llvm-config19 llvm-config NAMES_PER_DIR
         PATHS
             "/mingw64/bin"
             "/c/msys64/mingw64/bin"
             "c:/msys64/mingw64/bin"
-            "C:/Libraries/llvm-18.0.0/bin")
+            "C:/Libraries/llvm-19.0.0/bin")
 
     if ("${LLVM_CONFIG_EXE}" STREQUAL "LLVM_CONFIG_EXE-NOTFOUND")
       if (NOT LLVM_CONFIG_ERROR_MESSAGES STREQUAL "")
@@ -40,9 +40,9 @@ if(ZIG_USE_LLVM_CONFIG)
       OUTPUT_STRIP_TRAILING_WHITESPACE)
 
     get_filename_component(LLVM_CONFIG_DIR "${LLVM_CONFIG_EXE}" DIRECTORY)
-    if("${LLVM_CONFIG_VERSION}" VERSION_LESS 18 OR "${LLVM_CONFIG_VERSION}" VERSION_EQUAL 19 OR "${LLVM_CONFIG_VERSION}" VERSION_GREATER 19)
+    if("${LLVM_CONFIG_VERSION}" VERSION_LESS 19 OR "${LLVM_CONFIG_VERSION}" VERSION_EQUAL 20 OR "${LLVM_CONFIG_VERSION}" VERSION_GREATER 20)
       # Save the error message, in case this is the last llvm-config we find
-      list(APPEND LLVM_CONFIG_ERROR_MESSAGES "expected LLVM 18.x but found ${LLVM_CONFIG_VERSION} using ${LLVM_CONFIG_EXE}")
+      list(APPEND LLVM_CONFIG_ERROR_MESSAGES "expected LLVM 19.x but found ${LLVM_CONFIG_VERSION} using ${LLVM_CONFIG_EXE}")
 
       # Ignore this directory and try the search again
       list(APPEND CMAKE_IGNORE_PATH "${LLVM_CONFIG_DIR}")
@@ -63,12 +63,12 @@ if(ZIG_USE_LLVM_CONFIG)
         ERROR_VARIABLE LLVM_CONFIG_ERROR
         ERROR_STRIP_TRAILING_WHITESPACE)
 
-      if (LLVM_CONFIG_ERROR) 
+      if (LLVM_CONFIG_ERROR)
         # Save the error message, in case this is the last llvm-config we find
         if (ZIG_SHARED_LLVM)
-          list(APPEND LLVM_CONFIG_ERROR_MESSAGES "LLVM 18.x found at ${LLVM_CONFIG_EXE} does not support linking as a shared library")
+          list(APPEND LLVM_CONFIG_ERROR_MESSAGES "LLVM 19.x found at ${LLVM_CONFIG_EXE} does not support linking as a shared library")
         else()
-          list(APPEND LLVM_CONFIG_ERROR_MESSAGES "LLVM 18.x found at ${LLVM_CONFIG_EXE} does not support linking as a static library")
+          list(APPEND LLVM_CONFIG_ERROR_MESSAGES "LLVM 19.x found at ${LLVM_CONFIG_EXE} does not support linking as a static library")
         endif()
 
         # Ignore this directory and try the search again