diff --git a/ci/macos-latest-chrome b/ci/macos-latest-chrome
index 68e61f0..8c36ac4 100755
--- a/ci/macos-latest-chrome
+++ b/ci/macos-latest-chrome
@@ -1,4 +1,4 @@
 #!/bin/bash
 brew install --cask google-chrome
 brew install --cask chromedriver
-chromedriver &
+chromedriver --port=9515 &
diff --git a/ci/ubuntu-latest-chrome b/ci/ubuntu-latest-chrome
index 57e6db7..344f47c 100755
--- a/ci/ubuntu-latest-chrome
+++ b/ci/ubuntu-latest-chrome
@@ -1,4 +1,4 @@
 #!/bin/bash
 sudo apt-get update
 sudo apt-get install chromium-chromedriver
-chromedriver &
+chromedriver --port=9515 &
diff --git a/ci/windows-latest-chrome.ps1 b/ci/windows-latest-chrome.ps1
index 611f207..ab9a516 100755
--- a/ci/windows-latest-chrome.ps1
+++ b/ci/windows-latest-chrome.ps1
@@ -1,5 +1,5 @@
 npm i puppeteer
 npx @puppeteer/browsers install chrome@stable
 npx @puppeteer/browsers install chromedriver@stable
-Start-Process -FilePath chromedriver
+Start-Process -FilePath chromedriver -ArgumentList "--port=9515"
 Start-Sleep -Seconds 1