diff --git a/alpine/Dockerfile b/alpine/Dockerfile
index 9b37880d2301f731f0335f7c7253c3936c10dea5..ef3518ee555774026f2a7d4d44b4a6fa921d36bd 100644
--- a/alpine/Dockerfile
+++ b/alpine/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:8.12.0-alpine
+FROM node:8.15.0-alpine
 
 # Build arguments to change source url, branch or tag
 ARG CODIMD_REPOSITORY=https://github.com/hackmdio/codimd.git
diff --git a/debian/Dockerfile b/debian/Dockerfile
index 3c13518170bfd772c47068470002bb26fb5a54be..165f45799c16dec2cbe39196e8c67cf1083c6a44 100644
--- a/debian/Dockerfile
+++ b/debian/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:8.12.0
+FROM node:8.15.0
 
 # Build arguments to change source url, branch or tag
 ARG CODIMD_REPOSITORY=https://github.com/hackmdio/codimd.git
@@ -22,7 +22,7 @@ RUN set -ex; \
     \
 # verify the signature
     export GNUPGHOME="$(mktemp -d)"; \
-    gpg --import /tmp/gosu.key; \
+    gpg --no-tty --import /tmp/gosu.key; \
     gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu; \
     rm -rf "$GNUPGHOME" /usr/local/bin/gosu.asc; \
     \