diff --git a/.nvmrc b/.nvmrc
index 21cff1fb03..1821c1ce2d 100644
--- a/.nvmrc
+++ b/.nvmrc
@@ -1 +1 @@
-14.18.1
\ No newline at end of file
+14.21.3
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index 736c690de2..f32e540dda 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:12.20.2-buster-slim
+FROM node:14.21.3-buster-slim
 
 WORKDIR /usr/local
 
diff --git a/README.md b/README.md
index df9314705f..1357b3f066 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ Frontend of PyCon TW official website.
 
 ### Requirements
 
-- node >= 12.20.2
+- node >= 14.21.3
 
 > You can refer to `package.json` file for more details.
 
diff --git a/dev.Dockerfile b/dev.Dockerfile
index b75c11527b..d3f8b3a0c1 100644
--- a/dev.Dockerfile
+++ b/dev.Dockerfile
@@ -1,4 +1,4 @@
-FROM node:12.20.2
+FROM node:14.21.3
 
 WORKDIR /app
 
diff --git a/mock-server.Dockerfile b/mock-server.Dockerfile
index cc338db39b..487902f68a 100644
--- a/mock-server.Dockerfile
+++ b/mock-server.Dockerfile
@@ -1,8 +1,8 @@
-FROM node:12.20.2-buster-slim
+FROM node:14.21.3-buster-slim
 
 WORKDIR /usr/local
 
-RUN npm install -g json-server
+RUN npm install -g json-server@0.16.3
 
 COPY db.json routes.json json-server-middlewares.js ./