diff --git a/.github/workflows/check-in-tree-build.yml b/.github/workflows/check-in-tree-build.yml
index c5be8027..f26ba9bc 100644
--- a/.github/workflows/check-in-tree-build.yml
+++ b/.github/workflows/check-in-tree-build.yml
@@ -21,7 +21,7 @@ on:
     - cron: 0 0 * * 0
 
 env:
-  LLVM_VERSION: 14
+  LLVM_VERSION: 15
 
 jobs:
   build_and_test_linux:
@@ -42,13 +42,13 @@ jobs:
         uses: actions/checkout@v2
         with:
           repository: llvm/llvm-project
-          ref: release/14.x
+          ref: release/15.x
           path: llvm-project
       - name:  Checkout the translator sources
         uses: actions/checkout@v2
         with:
           repository: KhronosGroup/SPIRV-LLVM-Translator
-          ref: llvm_release_140
+          ref: llvm_release_150
           path: llvm-project/SPIRV-LLVM-Translator
       - name:  Checkout opencl-clang sources
         uses: actions/checkout@v2
diff --git a/CMakeLists.txt b/CMakeLists.txt
index bbb6019e..dab5634b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,7 +25,7 @@ if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
     add_definitions(-DUSE_PREBUILT_LLVM)
 
     if(NOT PREFERRED_LLVM_VERSION)
-        set(PREFERRED_LLVM_VERSION "14.0.0")
+        set(PREFERRED_LLVM_VERSION "15.0.0")
     endif(NOT PREFERRED_LLVM_VERSION)
     message(STATUS "[OPENCL-CLANG] Looking for LLVM version ${PREFERRED_LLVM_VERSION}")
     find_package(LLVM ${PREFERRED_LLVM_VERSION} REQUIRED)
@@ -85,13 +85,13 @@ set(TARGET_NAME ${COMMON_CLANG_LIBRARY_NAME}${BUILD_PLATFORM} )
 if(NOT USE_PREBUILT_LLVM)
 
     if(NOT LLVM_EXTERNAL_CLANG_SOURCE_DIR)
-        set(LLVM_BASE_REVISION release_14)
+        set(LLVM_BASE_REVISION release_15)
         set(CLANG_SOURCE_DIR ${LLVM_SOURCE_DIR}/tools/clang)
-        set(CLANG_BASE_REVISION release_14)
+        set(CLANG_BASE_REVISION release_15)
     elseif(EXISTS "${LLVM_EXTERNAL_CLANG_SOURCE_DIR}/CMakeLists.txt")
-	    set(LLVM_BASE_REVISION release/14.x)
+	    set(LLVM_BASE_REVISION release/15.x)
         set(CLANG_SOURCE_DIR "${LLVM_EXTERNAL_CLANG_SOURCE_DIR}")
-        set(CLANG_BASE_REVISION release/14.x)
+        set(CLANG_BASE_REVISION release/15.x)
     endif()
     if(EXISTS ${CLANG_SOURCE_DIR})
         message(STATUS "[OPENCL-CLANG] Using Clang source code direcotry: ${CLANG_SOURCE_DIR}")
@@ -126,8 +126,8 @@ if(NOT USE_PREBUILT_LLVM)
         )
     endif()
     
-    set(SPIRV_BASE_REVISION llvm_release_140)
-    set(TARGET_BRANCH "ocl-open-140")
+    set(SPIRV_BASE_REVISION llvm_release_150)
+    set(TARGET_BRANCH "ocl-open-150")
     get_filename_component(LLVM_MONOREPO_DIR ${LLVM_SOURCE_DIR} DIRECTORY)
     set(LLVM_PATCHES_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/patches/llvm
                           ${CMAKE_CURRENT_SOURCE_DIR}/patches/clang)
diff --git a/README.md b/README.md
index a1ef9786..84f68fb3 100644
--- a/README.md
+++ b/README.md
@@ -23,9 +23,9 @@ Before the build all dependencies must be downloaded and laid out as follows:
 This can be done using the following commands:
 ```bash
 cd <workspace>
-git clone https://github.com/llvm/llvm-project.git . -b release/14.x
-git clone https://github.com/KhronosGroup/SPIRV-LLVM-Translator.git -b llvm_release_140
-git clone https://github.com/intel/opencl-clang.git -b ocl-open-140
+git clone https://github.com/llvm/llvm-project.git . -b release/15.x
+git clone https://github.com/KhronosGroup/SPIRV-LLVM-Translator.git -b llvm_release_150
+git clone https://github.com/intel/opencl-clang.git -b ocl-open-150
 ```
 
 Then we need to create a build directory and run the build:
@@ -56,7 +56,7 @@ documented in [Embedding LLVM in your project](https://llvm.org/docs/CMake.html#
 Commands to checkout sources and build:
 ```bash
 cd <workspace>
-git clone https://github.com/intel/opencl-clang.git -b ocl-open-140
+git clone https://github.com/intel/opencl-clang.git -b ocl-open-150
 mkdir build && cd build
 cmake ../opencl-clang
 make all -j`nproc`
@@ -66,7 +66,7 @@ make all -j`nproc`
 
 ##### Preferred LLVM version
 
-By default, opencl-clang's cmake script is searching for LLVM 14.0.0. You can
+By default, opencl-clang's cmake script is searching for LLVM 15.0.0. You can
 override target version of LLVM by using the `PREFERRED_LLVM_VERSION` cmake
 option: