diff --git a/Dockerfile b/Dockerfile
index 7a7e643..5f589a9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,7 @@ RUN wget -O /tmp/WinBox_Linux.zip https://download.mikrotik.com/routeros/winbox/
     wget -O /tmp/upx.tar.xz https://github.com/upx/upx/releases/download/v5.0.1/upx-5.0.1-amd64_linux.tar.xz && \
     tar -xf /tmp/upx.tar.xz -C /tmp && \
     mv /tmp/winbox/WinBox /WinBox && \
-    /tmp/upx-5.0.1-amd64_linux/upx --best --ultra-brute /WinBox
+    /tmp/upx-5.0.1-amd64_linux/upx --lzma /WinBox
 
 FROM git.merith.xyz/gns3/base-vnc:latest