diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..c80c33e
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,79 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+    name: 'build'
+    runs-on: ubuntu-latest
+    steps:
+      - name: 'checkout'
+        uses: actions/checkout@v3
+        with:
+          path: nginx-module-vts
+      - name: 'checkout nginx'
+        uses: actions/checkout@v3
+        with:
+          repository: nginx/nginx
+          path: nginx
+      - name: 'checkout luajit2'
+        uses: actions/checkout@v3
+        with:
+          repository: openresty/luajit2
+          path: luajit2
+      - name: 'checkout ngx_devel_kit'
+        uses: actions/checkout@v3
+        with:
+          repository: vision5/ngx_devel_kit
+          path: ngx_devel_kit
+      - name: 'checkout lua-nginx-module'
+        uses: actions/checkout@v3
+        with:
+          repository: openresty/lua-nginx-module
+          path: lua-nginx-module
+      - name: 'checkout lua-resty-core'
+        uses: actions/checkout@v3
+        with:
+          repository: openresty/lua-resty-core
+          path: lua-resty-core
+      - name: 'checkout lua-resty-lrucache'
+        uses: actions/checkout@v3
+        with:
+          repository: openresty/lua-resty-lrucache
+          path: lua-resty-lrucache
+      - name: 'build luajit2'
+        working-directory: luajit2
+        run: |
+          make
+          sudo make install
+          sudo mkdir /usr/local/share/lua/5.1/resty
+      - name: 'link resty lib'
+        working-directory: /usr/local/share/lua/5.1/resty
+        run: |
+          sudo ln -s /home/runner/work/nginx-module-vts/nginx-module-vts/lua-resty-core/lib/resty/core core
+          sudo ln -s /home/runner/work/nginx-module-vts/nginx-module-vts/lua-resty-core/lib/resty/core.lua core.lua
+          sudo ln -s /home/runner/work/nginx-module-vts/nginx-module-vts/lua-resty-lrucache/lib/resty/lrucache lrucache
+          sudo ln -s /home/runner/work/nginx-module-vts/nginx-module-vts/lua-resty-lrucache/lib/resty/lrucache.lua lrucache.lua
+      - name: 'build nginx'
+        working-directory: nginx
+        run: |
+          ./auto/configure --with-ld-opt="-Wl,-rpath,/usr/local/lib" --without-pcre2 --with-cc-opt=-Wno-stringop-overread --add-module=/home/runner/work/nginx-module-vts/nginx-module-vts/ngx_devel_kit --add-module=/home/runner/work/nginx-module-vts/nginx-module-vts/lua-nginx-module --add-module=/home/runner/work/nginx-module-vts/nginx-module-vts/nginx-module-vts
+          make
+          sudo make install
+          /usr/local/nginx/sbin/nginx -V
+        env:
+          LUAJIT_LIB: /usr/local/lib
+          LUAJIT_INC: /usr/local/include/luajit-2.1
+      - name: 'prepare cpanm'
+        run: |
+          sudo apt install -y cpanminus
+          sudo cpanm install Test::Nginx::Socket
+      - name: 'test'
+        working-directory: nginx-module-vts
+        run: |
+          echo "/usr/local/nginx/sbin/" >> $GITHUB_PATH
+          sudo PATH=/usr/local/nginx/sbin:$PATH prove -r t
diff --git a/t/021.set_by_filter.t b/t/021.set_by_filter.t
index 07d17ee..9924576 100644
--- a/t/021.set_by_filter.t
+++ b/t/021.set_by_filter.t
@@ -84,7 +84,7 @@ __DATA__
                      '2xx:$2xx';
     access_log  logs/access.log basic;
     upstream backend {
-        server localhost:1984;
+        server 127.0.0.1:1984;
     }
 --- config
     location /status {
@@ -101,7 +101,7 @@ __DATA__
         vhost_traffic_status_set_by_filter $outBytes $group/$zone/outBytes;
         vhost_traffic_status_set_by_filter $2xx $group/$zone/2xx;
 
-        proxy_pass http://localhost:1984/return;
+        proxy_pass http://127.0.0.1:1984/return;
     }
 --- user_files eval
 [
@@ -130,7 +130,7 @@ __DATA__
                      '2xx:$2xx';
     access_log  logs/access.log basic;
     upstream backend {
-        server localhost:1984;
+        server 127.0.0.1:1984;
     }
 --- config
     location /v {
@@ -211,7 +211,7 @@ __DATA__
                      'cacheUsedSize:$cacheUsedSize cacheHit:$cacheHit';
     access_log  logs/access.log basic;
     upstream backend {
-        server localhost:1984;
+        server 127.0.0.1:1984;
     }
 --- config
     location /v {