diff --git a/CMakeLists.txt b/CMakeLists.txt
index 703dc7d..2026c20 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -100,7 +100,7 @@ elseif(APPLE)
   find_library(IOKIT_LIBRARY IOKit)
   find_library(OPENGL_LIBRARY OpenGL)
   unset(BOO_HAS_METAL CACHE)
-  if (NOT CMAKE_OSX_DEPLOYMENT_TARGET OR CMAKE_OSX_DEPLOYMENT_TARGET VERSION_GREATER 10.10)
+  if (NOT CMAKE_OSX_DEPLOYMENT_TARGET OR CMAKE_OSX_DEPLOYMENT_TARGET VERSION_GREATER 10.11)
     set(BOO_HAS_METAL ON CACHE BOOL "Metal is available in this OS X version" FORCE)
     find_library(METAL_LIBRARY Metal)
     list(APPEND _BOO_SYS_DEFINES -DBOO_HAS_METAL=1)
@@ -212,7 +212,7 @@ target_include_directories(glslang-default-resource-limits
 list(APPEND _BOO_SYS_LIBS glslang soxr xxhash OSDependent OGLCompiler SPIRV glslang-default-resource-limits)
 
 set(BOO_SYS_LIBS ${_BOO_SYS_LIBS} CACHE PATH "boo system libraries" FORCE)
-set(BOO_SYS_DEFINES ${_BOO_SYS_DEFINES} CACHE PATH "boo system defines" FORCE)
+set(BOO_SYS_DEFINES ${_BOO_SYS_DEFINES} CACHE STRING "boo system defines" FORCE)
 set(BOO_SYS_INCLUDES ${_BOO_SYS_INCLUDES} CACHE PATH "boo system includes" FORCE)
 
 add_definitions(${_BOO_SYS_DEFINES})
diff --git a/lib/graphicsdev/Metal.mm b/lib/graphicsdev/Metal.mm
index 86b4c90..0addc45 100644
--- a/lib/graphicsdev/Metal.mm
+++ b/lib/graphicsdev/Metal.mm
@@ -1297,7 +1297,7 @@ IShaderPipeline* MetalDataFactory::Context::newShaderPipeline(const char* vertSo
         MetalData* d = MetalDataFactoryImpl::m_deferredData.get();
         MetalDataFactoryImpl& factory = static_cast<MetalDataFactoryImpl&>(m_parent);
         MTLCompileOptions* compOpts = [MTLCompileOptions new];
-        compOpts.languageVersion = MTLLanguageVersion1_1;
+        compOpts.languageVersion = MTLLanguageVersion1_2;
         NSError* err = nullptr;
 
         XXH64_state_t hashState;