diff --git a/Dockerfile b/Dockerfile
index c50454f..58f2725 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 # Pre-define ARGs to ensure correct scope
 ARG GLIBC_VER=2.29
 ARG BUSYB_VER=1.30.1
-ARG SU_EXEC_VER=0.3
+ARG SU_EXEC_VER=0.4
 ARG TINI_VER=0.18.0
 
 FROM spritsail/debian-builder as builder