diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 984d95e..28196cf 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -6,11 +6,11 @@ cache: # add cache to 'node_modules' for speeding up builds
 
 before_script:
   - apk update && apk add git
-  - npm install
+  - npm install --only=prod
 
 test:
   script:
-    - npm install snyk && npm run snyk # Refer to "scripts" in package.json
+    - npm install --only=prod snyk && npm run snyk # Refer to "scripts" in package.json
     - npm run hexo
 
   only:
@@ -23,7 +23,7 @@ test:
 
 renovate: # Check dependency update
   script:
-    - npm install renovate
+    - npm install --only=prod renovate
     - npm run renovate
 
   only:
diff --git a/.npmrc b/.npmrc
index 5e32bcc..77171bd 100644
--- a/.npmrc
+++ b/.npmrc
@@ -1,3 +1,2 @@
-only=prod
 package-lock=false
 optional=false
diff --git a/netlify.toml b/netlify.toml
index c0b10a4..a81d8fd 100644
--- a/netlify.toml
+++ b/netlify.toml
@@ -1,3 +1,3 @@
 [context.production]
   publish = "public"
-  command = "npm install snyk && npm run snyk && npm run hexo"
+  command = "npm install --only=prod snyk && npm run snyk && npm run hexo"
diff --git a/package.json b/package.json
index 3595712..dedc9ab 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,9 @@
     "hexo-nofollow": "curbengh/hexo-nofollow#v2.0",
     "hexo-renderer-ejs": "hexojs/hexo-renderer-ejs",
     "hexo-renderer-marked": "hexojs/hexo-renderer-marked",
-    "hexo-server": "hexojs/hexo-server",
     "hexo-yam": "curbengh/hexo-yam"
+  },
+  "devDependencies": {
+    "hexo-server": "hexojs/hexo-server"
   }
 }