diff --git a/CMakeLists.txt b/CMakeLists.txt
index fe3bd865..d8d51d88 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -80,6 +80,11 @@ if( MSVC )
         SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /MP")
         SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP")
     endif()
+
+    # spdlog 1.17+ bundles fmt v12, which requires UTF-8 source encoding on MSVC.
+    # See https://github.com/fmtlib/fmt/pull/4159
+    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /utf-8")
+    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /utf-8")
 # GCC
 elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
 
diff --git a/FlingEngine/Graphics/inc/GraphicsHelpers.h b/FlingEngine/Graphics/inc/GraphicsHelpers.h
index 38eee371..caadae1c 100644
--- a/FlingEngine/Graphics/inc/GraphicsHelpers.h
+++ b/FlingEngine/Graphics/inc/GraphicsHelpers.h
@@ -11,7 +11,7 @@
 	VkResult res = (f);																\
 	if (res != VK_SUCCESS)															\
 	{																				\
-		F_LOG_ERROR("VkResult is {} in {} at line {}", res, __FILE__, __LINE__);	\
+		F_LOG_ERROR("VkResult is {} in {} at line {}", static_cast<int>(res), __FILE__, __LINE__);	\
 		assert(res == VK_SUCCESS);													\
 	}																				\
 }
diff --git a/external/spdlog b/external/spdlog
index a7148b71..79524ddd 160000
--- a/external/spdlog
+++ b/external/spdlog
@@ -1 +1 @@
-Subproject commit a7148b718ea2fabb8387cb90aee9bf448da63e65
+Subproject commit 79524ddd08a4ec981b7fea76afd08ee05f83755d