diff --git a/pica-codimd/Dockerfile b/pica-codimd/Dockerfile
index 0a0dc5937fb0f48f2bd70bcce46ddf546e71886d..41855b7c8d81f40e94d1209be752a483c0879d27 100644
--- a/pica-codimd/Dockerfile
+++ b/pica-codimd/Dockerfile
@@ -1,6 +1,7 @@
 FROM node:10.22.1-alpine3.11 as BUILD
 
 ENV VERSION=2.2.0
+ENV PORTCHECKER_VERSION=v1.0.6
 
 RUN apk add --no-cache --virtual .gyp libressl-dev git bash python make && \
 wget https://github.com/hackmdio/codimd/archive/$VERSION.tar.gz && \