diff --git a/src/engine/engine.h b/src/engine/engine.h
index 1db10e534..d9772cd37 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -54,8 +54,10 @@
 #define EXTERN_BUSY_BEGIN_SOFT e->softLocked=true; e->isBusy.lock();
 #define EXTERN_BUSY_END e->isBusy.unlock(); e->softLocked=false;
 
-#define DIV_VERSION "0.6pre7"
-#define DIV_ENGINE_VERSION 162
+#define DIV_UNSTABLE
+
+#define DIV_VERSION "dev163"
+#define DIV_ENGINE_VERSION 163
 // for imports
 #define DIV_VERSION_MOD 0xff01
 #define DIV_VERSION_FC 0xff02
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 428748b65..cc946fbd3 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -5759,6 +5759,17 @@ bool FurnaceGUI::loop() {
       introPos=12.0;
     }
 
+#ifdef DIV_UNSTABLE
+    {
+      ImDrawList* dl=ImGui::GetForegroundDrawList();
+      ImVec2 markPos=ImVec2(canvasW-ImGui::CalcTextSize(DIV_VERSION).x-6.0*dpiScale,6.0*dpiScale);
+      ImVec4 markColor=uiColors[GUI_COLOR_TEXT];
+      markColor.w=0.67f;
+
+      dl->AddText(markPos,ImGui::ColorConvertFloat4ToU32(markColor),DIV_VERSION);
+    }
+#endif
+
     layoutTimeEnd=SDL_GetPerformanceCounter();
 
     // backup trigger