diff --git a/build/Dockerfile b/build/Dockerfile
index b5f8ed56..3a6f8483 100644
--- a/build/Dockerfile
+++ b/build/Dockerfile
@@ -16,7 +16,7 @@ ARG BASE=github.com/wencaiwulue/kubevpn
 RUN sed -i s@/security.ubuntu.com/@/mirrors.aliyun.com/@g /etc/apt/sources.list \
     && sed -i s@/archive.ubuntu.com/@/mirrors.aliyun.com/@g /etc/apt/sources.list
 RUN apt-get clean && apt-get update && apt-get install -y wget dnsutils vim curl  \
-    net-tools iptables iputils-ping lsof iproute2 tcpdump binutils traceroute
+    net-tools iptables iputils-ping lsof iproute2 tcpdump binutils traceroute conntrack
 
 ENV TZ=Asia/Shanghai \
     DEBIAN_FRONTEND=noninteractive
diff --git a/build/local.Dockerfile b/build/local.Dockerfile
index 028ed258..5a400561 100644
--- a/build/local.Dockerfile
+++ b/build/local.Dockerfile
@@ -8,7 +8,7 @@ FROM ubuntu:latest
 RUN sed -i s@/security.ubuntu.com/@/mirrors.aliyun.com/@g /etc/apt/sources.list \
     && sed -i s@/archive.ubuntu.com/@/mirrors.aliyun.com/@g /etc/apt/sources.list
 RUN apt-get clean && apt-get update && apt-get install -y wget dnsutils vim curl  \
-    net-tools iptables iputils-ping lsof iproute2 tcpdump binutils traceroute
+    net-tools iptables iputils-ping lsof iproute2 tcpdump binutils traceroute conntrack
 
 ENV TZ=Asia/Shanghai \
     DEBIAN_FRONTEND=noninteractive