diff --git a/Common/MVKCommonEnvironment.h b/Common/MVKCommonEnvironment.h
index c95992236..7ed83bba8 100644
--- a/Common/MVKCommonEnvironment.h
+++ b/Common/MVKCommonEnvironment.h
@@ -88,6 +88,10 @@ extern "C" {
 #endif
 
 /** Building with Xcode versions. iOS version also covers tvOS. */
+#ifndef MVK_XCODE_15
+#	define MVK_XCODE_15				((__MAC_OS_X_VERSION_MAX_ALLOWED >= 140000) || \
+									(__IPHONE_OS_VERSION_MAX_ALLOWED >= 170000))
+#endif
 #ifndef MVK_XCODE_14_3
 #	define MVK_XCODE_14_3			((__MAC_OS_X_VERSION_MAX_ALLOWED >= 130300) || \
 									(__IPHONE_OS_VERSION_MAX_ALLOWED >= 160400))
diff --git a/MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm b/MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm
index fa8fd1d80..ed481b0b0 100644
--- a/MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm
+++ b/MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm
@@ -1737,6 +1737,11 @@
 		_metalFeatures.mslVersionEnum = MTLLanguageVersion3_0;
 	}
 #endif
+#if MVK_XCODE_15
+	if ( mvkOSVersionIsAtLeast(17.0) ) {
+		_metalFeatures.mslVersionEnum = MTLLanguageVersion3_1;
+	}
+#endif
 
 #endif
 
@@ -1855,6 +1860,11 @@
 		_metalFeatures.mslVersionEnum = MTLLanguageVersion3_0;
 	}
 #endif
+#if MVK_XCODE_15
+	if ( mvkOSVersionIsAtLeast(17.0) ) {
+		_metalFeatures.mslVersionEnum = MTLLanguageVersion3_1;
+	}
+#endif
 
 #endif
 
@@ -1940,6 +1950,11 @@
 		_metalFeatures.mslVersionEnum = MTLLanguageVersion3_0;
 	}
 #endif
+#if MVK_XCODE_15
+	if ( mvkOSVersionIsAtLeast(14.0) ) {
+		_metalFeatures.mslVersionEnum = MTLLanguageVersion3_1;
+	}
+#endif
 
 	// This is an Apple GPU--treat it accordingly.
 	if (supportsMTLGPUFamily(Apple1)) {
@@ -2055,6 +2070,11 @@
 	_metalFeatures.mslVersion = SPIRV_CROSS_NAMESPACE::CompilerMSL::Options::make_msl_version(maj, min);
 
 	switch (_metalFeatures.mslVersionEnum) {
+#if MVK_XCODE_15
+		case MTLLanguageVersion3_1:
+			setMSLVersion(3, 1);
+			break;
+#endif
 #if MVK_XCODE_14
 		case MTLLanguageVersion3_0:
 			setMSLVersion(3, 0);
diff --git a/MoltenVK/MoltenVK/GPUObjects/MVKPixelFormats.mm b/MoltenVK/MoltenVK/GPUObjects/MVKPixelFormats.mm
index 79f1dffa9..7dfbec9fb 100644
--- a/MoltenVK/MoltenVK/GPUObjects/MVKPixelFormats.mm
+++ b/MoltenVK/MoltenVK/GPUObjects/MVKPixelFormats.mm
@@ -922,9 +922,14 @@
 	addVkFormatDesc( R64G64B64A64_SINT, Invalid, Invalid, Invalid, Invalid, 1, 1, 32, ColorFloat );
 	addVkFormatDesc( R64G64B64A64_SFLOAT, Invalid, Invalid, Invalid, Invalid, 1, 1, 32, ColorFloat );
 
+#if MVK_XCODE_15
+	addVkFormatDesc( B10G11R11_UFLOAT_PACK32, RG11B10Float, Invalid, FloatRG11B10, Invalid, 1, 1, 4, ColorFloat );
+	addVkFormatDesc( E5B9G9R9_UFLOAT_PACK32, RGB9E5Float, Invalid, FloatRGB9E5, Invalid, 1, 1, 4, ColorFloat );
+#else
 	addVkFormatDesc( B10G11R11_UFLOAT_PACK32, RG11B10Float, Invalid, Invalid, Invalid, 1, 1, 4, ColorFloat );
 	addVkFormatDesc( E5B9G9R9_UFLOAT_PACK32, RGB9E5Float, Invalid, Invalid, Invalid, 1, 1, 4, ColorFloat );
-
+#endif
+	
 	addVkFormatDesc( D32_SFLOAT, Depth32Float, Invalid, Invalid, Invalid, 1, 1, 4, DepthStencil );
 	addVkFormatDesc( D32_SFLOAT_S8_UINT, Depth32Float_Stencil8, Invalid, Invalid, Invalid, 1, 1, 5, DepthStencil );
 
@@ -1338,6 +1343,11 @@
 	addMTLVertexFormatDesc( Half, None, None );
 
 	addMTLVertexFormatDesc( UChar4Normalized_BGRA, None, None );
+	
+#if MVK_XCODE_15
+	addMTLVertexFormatDesc( FloatRG11B10, Vertex, Vertex );
+	addMTLVertexFormatDesc( FloatRGB9E5, Vertex, Vertex );
+#endif
 
 	// When adding to this list, be sure to ensure _mtlVertexFormatCount is large enough for the format count
 }
@@ -1634,6 +1644,11 @@
 	addFeatSetMTLVtxFmtCaps( macOS_GPUFamily1_v3, Short, Vertex );
 	addFeatSetMTLVtxFmtCaps( macOS_GPUFamily1_v3, Half, Vertex );
 	addFeatSetMTLVtxFmtCaps( macOS_GPUFamily1_v3, UChar4Normalized_BGRA, Vertex );
+	
+#if MVK_XCODE_15
+	addGPUOSMTLVtxFmtCaps( Apple5, 14.0, FloatRG11B10, Vertex );
+	addGPUOSMTLVtxFmtCaps( Apple5, 14.0, FloatRGB9E5, Vertex );
+#endif
 #endif
 
 #if MVK_TVOS
@@ -1727,6 +1742,11 @@
 	addFeatSetMTLVtxFmtCaps( tvOS_GPUFamily1_v3, Short, Vertex );
 	addFeatSetMTLVtxFmtCaps( tvOS_GPUFamily1_v3, Half, Vertex );
 	addFeatSetMTLVtxFmtCaps( tvOS_GPUFamily1_v3, UChar4Normalized_BGRA, Vertex );
+	
+#if MVK_XCODE_15
+	addGPUOSMTLVtxFmtCaps( Apple5, 17.0, FloatRG11B10, Vertex );
+	addGPUOSMTLVtxFmtCaps( Apple5, 17.0, FloatRGB9E5, Vertex );
+#endif
 
 	// Disable for tvOS simulator last.
 #if MVK_OS_SIMULATOR
@@ -1884,6 +1904,11 @@
 	addFeatSetMTLVtxFmtCaps( iOS_GPUFamily1_v4, Short, Vertex );
 	addFeatSetMTLVtxFmtCaps( iOS_GPUFamily1_v4, Half, Vertex );
 	addFeatSetMTLVtxFmtCaps( iOS_GPUFamily1_v4, UChar4Normalized_BGRA, Vertex );
+	
+#if MVK_XCODE_15
+	addGPUOSMTLVtxFmtCaps( Apple5, 17.0, FloatRG11B10, Vertex );
+	addGPUOSMTLVtxFmtCaps( Apple5, 17.0, FloatRGB9E5, Vertex );
+#endif
 
 // Disable for iOS simulator last.
 #if MVK_OS_SIMULATOR
diff --git a/MoltenVKShaderConverter/MoltenVKShaderConverterTool/OSSupport.mm b/MoltenVKShaderConverter/MoltenVKShaderConverterTool/OSSupport.mm
index 965d6cb03..c90b878ac 100644
--- a/MoltenVKShaderConverter/MoltenVKShaderConverterTool/OSSupport.mm
+++ b/MoltenVKShaderConverter/MoltenVKShaderConverterTool/OSSupport.mm
@@ -71,6 +71,11 @@
 #define mslVer(MJ, MN, PT)	mslVersionMajor == MJ && mslVersionMinor == MN && mslVersionPoint == PT
 
 	MTLLanguageVersion mslVerEnum = (MTLLanguageVersion)0;
+#if MVK_XCODE_15
+	if (mslVer(3, 1, 0)) {
+		mslVerEnum = MTLLanguageVersion3_1;
+	} else
+#endif
 #if MVK_XCODE_14
 	if (mslVer(3, 0, 0)) {
 		mslVerEnum = MTLLanguageVersion3_0;