diff --git a/reactos/dll/win32/dwmapi/dwmapi.spec b/reactos/dll/win32/dwmapi/dwmapi.spec
index 876787fab4a..49823608601 100644
--- a/reactos/dll/win32/dwmapi/dwmapi.spec
+++ b/reactos/dll/win32/dwmapi/dwmapi.spec
@@ -42,4 +42,4 @@
 @ stub DwmSetPresentParameters
 @ stdcall DwmSetWindowAttribute(long long ptr long)
 @ stdcall DwmUnregisterThumbnail(long)
-@ stub DwmUpdateThumbnailProperties
+@ stdcall DwmUpdateThumbnailProperties(ptr ptr)
diff --git a/reactos/dll/win32/dwmapi/dwmapi_main.c b/reactos/dll/win32/dwmapi/dwmapi_main.c
index 99ad383276b..76c10cebd4d 100644
--- a/reactos/dll/win32/dwmapi/dwmapi_main.c
+++ b/reactos/dll/win32/dwmapi/dwmapi_main.c
@@ -256,3 +256,12 @@ HRESULT WINAPI DwmDetachMilContent(HWND hwnd)
     FIXME("(%p) stub\n", hwnd);
     return E_NOTIMPL;
 }
+
+/**********************************************************************
+ *           DwmUpdateThumbnailProperties         (DWMAPI.@)
+ */
+HRESULT WINAPI DwmUpdateThumbnailProperties(HTHUMBNAIL thumbnail, const DWM_THUMBNAIL_PROPERTIES *props)
+{
+    FIXME("(%p, %p) stub\n", thumbnail, props);
+    return E_NOTIMPL;
+}
diff --git a/reactos/media/doc/README.WINE b/reactos/media/doc/README.WINE
index 6a5c6a8a053..29b38587e23 100644
--- a/reactos/media/doc/README.WINE
+++ b/reactos/media/doc/README.WINE
@@ -65,7 +65,7 @@ reactos/dll/win32/cryptnet            # Synced to WineStaging-1.7.47
 reactos/dll/win32/cryptui             # Synced to WineStaging-1.7.47
 reactos/dll/win32/dbghelp             # Synced to WineStaging-1.7.47
 reactos/dll/win32/dciman32            # Synced to WineStaging-1.7.47
-reactos/dll/win32/dwmapi              # Synced to WineStaging-1.7.47
+reactos/dll/win32/dwmapi              # Synced to WineStaging-1.7.55
 reactos/dll/win32/faultrep            # Synced to WineStaging-1.7.47
 reactos/dll/win32/fltlib              # Synced to WineStaging-1.7.47
 reactos/dll/win32/fusion              # Synced to WineStaging-1.7.47