diff --git a/src/test-device/Dockerfile b/src/test-device/Dockerfile
index 2251d66..6af9ef6 100644
--- a/src/test-device/Dockerfile
+++ b/src/test-device/Dockerfile
@@ -1,6 +1,6 @@
 # https://hub.docker.com/r/qemux/qemu-docker
 # https://github.com/qemus/qemu-docker
-FROM qemux/qemu-docker:6.03
+FROM qemux/qemu-docker:6.04
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
 	minicom \