diff --git a/CMakeLists.txt b/CMakeLists.txt
index 676ae2ae8..cc67c7e66 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -142,7 +142,7 @@ include_directories(${glm_SOURCE_DIR}/src)
 
 FetchContent_Declare(vkbootstrap
                      GIT_REPOSITORY https://github.com/charles-lunarg/vk-bootstrap.git 
-                     GIT_TAG main)
+                     GIT_TAG v1.4.339)
 FetchContent_MakeAvailable(vkbootstrap)
 include_directories(${vkbootstrap_SOURCE_DIR}/src)
 
diff --git a/include/VESystem.h b/include/VESystem.h
index 21d24a9f7..5176afd4a 100644
--- a/include/VESystem.h
+++ b/include/VESystem.h
@@ -125,7 +125,7 @@ namespace vve {
 		//------------------------------------------------------------------------------------------------
 
 		/** @brief Message for mouse move events */
-		struct MsgMouseMove : public MsgBase { MsgMouseMove(double dt, float x, float y); float m_x; float m_y; };
+		struct MsgMouseMove : public MsgBase { MsgMouseMove(double dt, float x, float y, float xrel, float yrel); float m_x; float m_y; float m_xrel; float m_yrel; };
 	    /** @brief Message for mouse button down events */
 	    struct MsgMouseButtonDown : public MsgBase { MsgMouseButtonDown(double dt, int button); int m_button; };
 	    /** @brief Message for mouse button up events */
diff --git a/src/VESystem.cpp b/src/VESystem.cpp
index e8e1dda90..256f931ef 100644
--- a/src/VESystem.cpp
+++ b/src/VESystem.cpp
@@ -36,7 +36,7 @@ namespace vve {
     
 	//------------------------------------------------------------------------
 
-	System::MsgMouseMove:: MsgMouseMove(double dt, float x, float y): MsgBase{"SDL_MOUSE_MOVE", dt}, m_x{x}, m_y{y} {}; 
+    System::MsgMouseMove:: MsgMouseMove(double dt, float x, float y, float xrel, float yrel): MsgBase{"SDL_MOUSE_MOVE", dt}, m_x{x}, m_y{y}, m_xrel{xrel}, m_yrel{yrel} {}; 
     System::MsgMouseButtonDown:: MsgMouseButtonDown(double dt, int button): MsgBase{"SDL_MOUSE_BUTTON_DOWN", dt}, m_button{button} {}; 
     System::MsgMouseButtonUp::MsgMouseButtonUp(double dt, int button): MsgBase{"SDL_MOUSE_BUTTON_UP", dt}, m_button{button} {}; 
     System::MsgMouseButtonRepeat::MsgMouseButtonRepeat(double dt, int button): MsgBase{"SDL_MOUSE_BUTTON_REPEAT", dt}, m_button{button} {}; 
diff --git a/src/VEWindowSDL.cpp b/src/VEWindowSDL.cpp
index b6ab1ac99..4f7b17cb0 100644
--- a/src/VEWindowSDL.cpp
+++ b/src/VEWindowSDL.cpp
@@ -149,7 +149,7 @@ namespace vve {
                     wstate().m_isMinimized = false;
                 	break;
                 case SDL_EVENT_MOUSE_MOTION:
-                    m_engine.SendMsg( MsgMouseMove{message.GetDt(), event.motion.x, event.motion.y} );
+                    m_engine.SendMsg( MsgMouseMove{message.GetDt(), event.motion.x, event.motion.y, event.motion.xrel, event.motion.yrel} );
                     break;
                 case SDL_EVENT_MOUSE_BUTTON_DOWN:
                     m_engine.SendMsg( MsgMouseButtonDown{message.GetDt(), event.button.button} );