diff --git a/bin/update_version.sh b/bin/update_version.sh
index e75b085d..d6f24e23 100755
--- a/bin/update_version.sh
+++ b/bin/update_version.sh
@@ -24,7 +24,7 @@ for i in README.md site/content/install.md ; do
 done
 
 for i in $(find dockers -name Dockerfile) ; do
-  sed "s/ARG version=\"[0-9.]*\"/ARG version=\"${VERSION}\"/g" "$i" > a ; mv a "$i"
+  sed "s/ARG PochiVersion=\"[0-9.]*\"/ARG PochiVersion=\"${VERSION}\"/g" "$i" > a ; mv a "$i"
 done
 
 for i in bin/make_dist.sh bin/build_site.sh bin/build_dockers.sh ; do
diff --git a/dockers/pochi-groovysh/Dockerfile b/dockers/pochi-groovysh/Dockerfile
index 840deac5..d13d2c3c 100644
--- a/dockers/pochi-groovysh/Dockerfile
+++ b/dockers/pochi-groovysh/Dockerfile
@@ -19,7 +19,7 @@ ARG PochiVersion="2.3.1"
 ARG GroovyVersion="3.0.8"
 
 LABEL maintainer="Haruaki Tamada" \
-      pochi-version="${version}" \
+      pochi-version="${PochiVersion}" \
       description="Java birthmarking toolkit."
 
 COPY --from=base  /opt/openjdk-11-minimal /opt/openjdk-11-minimal
diff --git a/dockers/pochi/Dockerfile b/dockers/pochi/Dockerfile
index 5285ad9f..785eb303 100644
--- a/dockers/pochi/Dockerfile
+++ b/dockers/pochi/Dockerfile
@@ -18,7 +18,7 @@ FROM alpine:3.10.1
 ARG PochiVersion="2.3.1"
 
 LABEL maintainer="Haruaki Tamada" \
-      pochi-version="${version}" \
+      pochi-version="${PochiVersion}" \
       description="Java birthmarking toolkit (without interactive mode)."
 
 COPY --from=base  /opt/openjdk-11-minimal /opt/openjdk-11-minimal