diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index e0937e6..4f78db6 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,7 +17,7 @@ jobs:
       - name: Set Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: 16.x
+          node-version: 20.x
 
       - name: Set up Go
         uses: actions/setup-go@v5
diff --git a/action.yml b/action.yml
index a8f4470..5f76974 100644
--- a/action.yml
+++ b/action.yml
@@ -1,15 +1,15 @@
-name: 'actions-goveralls'
-description: 'Coveralls GitHub Action with Go integration powered by mattn/goveralls'
-author: 'ICHINOSE Shogo'
+name: "actions-goveralls"
+description: "Coveralls GitHub Action with Go integration powered by mattn/goveralls"
+author: "ICHINOSE Shogo"
 inputs:
   github-token:
     description: Coveralls uses this token to verify the posted coverage data on the repo and create a new check based on the results.
     required: true
-    default: '${{ github.token }}'
+    default: "${{ github.token }}"
   path-to-profile:
     description: a path to your cover profile.
     required: false
-    default: ''
+    default: ""
   parallel:
     description: 'Set to true if you are running parallel jobs, then use "parallel_finished: true" for the last action.'
     required: false
@@ -21,29 +21,29 @@ inputs:
   job-number:
     description: "job number (DEPRECATED)"
     required: false
-    default: '${{ strategy.job-index }}'
+    default: "${{ strategy.job-index }}"
     deprecationMessage: "use flag-name instead"
   flag-name:
     description: 'Job flag name, e.g. "Unit", "Functional", or "Integration". Will be shown in the Coveralls UI.'
     required: false
-    default: '${{ strategy.job-index }}'
+    default: "${{ strategy.job-index }}"
   working-directory:
     description: "working directory"
     required: false
-    default: '.'
+    default: "."
   ignore:
     description: Comma separated files to ignore
     required: false
-    default: ''
+    default: ""
   shallow:
     description: Shallow coveralls internal server errors
     required: false
     default: false
 
 runs:
-  using: 'node16'
-  main: 'lib/main.js'
+  using: "node20"
+  main: "lib/main.js"
 
 branding:
-  color: 'green'
-  icon: 'percent'
+  color: "green"
+  icon: "percent"
diff --git a/go.mod b/go.mod
index a3d78b4..eb2f6d4 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/shogo82148/actions-goveralls
 
-go 1.20
+go 1.21.6
 
 require github.com/mattn/goveralls v0.0.12
 
diff --git a/package-lock.json b/package-lock.json
index 00570b6..ccadbab 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3316,9 +3316,9 @@
       }
     },
     "node_modules/semver": {
-      "version": "6.3.0",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
-      "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+      "version": "6.3.1",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
+      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
       "dev": true,
       "bin": {
         "semver": "bin/semver.js"
@@ -6334,9 +6334,9 @@
       "dev": true
     },
     "semver": {
-      "version": "6.3.0",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
-      "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+      "version": "6.3.1",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
+      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
       "dev": true
     },
     "shebang-command": {
diff --git a/run-in-docker.sh b/run-in-docker.sh
index 7c2ad5b..9e9773c 100755
--- a/run-in-docker.sh
+++ b/run-in-docker.sh
@@ -8,4 +8,4 @@ docker run --rm \
     -v actions-goveralls-cache:/go/pkg/mod \
     -v actions-goveralls-cache:/root/.cache \
     -v "$CURRENT":/go/src/github.com/shogo82148/actions-goveralls \
-    -w /go/src/github.com/shogo82148/actions-goveralls golang:1.21.0 "$@"
+    -w /go/src/github.com/shogo82148/actions-goveralls golang:1.21.6 "$@"