diff --git a/src/test/resources/sshd/Dockerfile b/src/test/resources/sshd/Dockerfile
index ffb1b3c..b5bbce4 100644
--- a/src/test/resources/sshd/Dockerfile
+++ b/src/test/resources/sshd/Dockerfile
@@ -1,6 +1,6 @@
 FROM linuxserver/openssh-server
 RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories \
-    && apk update && apk add wget gcc g++ git make zsh htop stress-ng inetutils-telnet xclock xcalc xorg-server xinit && wget https://ohse.de/uwe/releases/lrzsz-0.12.20.tar.gz \
+    && apk update && apk add wget tmux gcc g++ git make zsh htop stress-ng inetutils-telnet xclock xcalc xorg-server xinit && wget https://ohse.de/uwe/releases/lrzsz-0.12.20.tar.gz \
     && tar -xf lrzsz-0.12.20.tar.gz && cd lrzsz-0.12.20 && ./configure && make && make install \
     && ln -s /usr/local/bin/lrz /usr/local/bin/rz && ln -s /usr/local/bin/lsz /usr/local/bin/sz
 RUN sed -i 's/#AllowAgentForwarding yes/AllowAgentForwarding yes/g' /etc/ssh/sshd_config