diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..9334b62
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,11 @@
+---
+version: 2
+
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+      time: '04:00'
+      timezone: Europe/Copenhagen
+    open-pull-requests-limit: 20
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
new file mode 100644
index 0000000..834668b
--- /dev/null
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,37 @@
+---
+name: Lint
+on: pull_request
+
+# Detect if this action is already running, and cancel it.
+# This most likely happened because a second push has been made to a branch.
+concurrency:
+  group: ${{ github.repository_id }}-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  actionlint:
+    name: GitHub Actions
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: reviewdog/action-actionlint@v1
+  markdownlint:
+    name: Markdown
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - name: Run markdownlint
+        uses: DavidAnson/markdownlint-cli2-action@v16
+  yamllint:
+    name: YAML
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - name: Run Yamllint
+        uses: frenck/action-yamllint@v1.5.0
+        with:
+          strict: true
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 623913c..0bc873f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -1,3 +1,4 @@
+---
 name: "Testing action-platformsh-url"
 
 on: pull_request
@@ -8,7 +9,7 @@ jobs:
     name: "Testing on a branch that has an active environment"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - uses: ./
         id: active_url
@@ -22,7 +23,7 @@ jobs:
     name: "Testing on a branch that does not exist"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - uses: ./
         id: missing_url
@@ -31,11 +32,11 @@ jobs:
           PLATFORMSH_ID: ${{ secrets.TEST_PLATFORMSH_ID }}
           PLATFORMSH_KEY: ${{ secrets.TEST_PLATFORMSH_KEY }}
           ENVIRONMENT_NAME: nonexistent
-          DEPLOY_WAIT_TIME: 10
+          PSH_DETECTION_WAIT: 10
 
       - name: Check for failure
         if: ${{ steps.missing_url.outcome != 'failure' }}
-        uses: actions/github-script@v3
+        uses: actions/github-script@v7
         with:
           script: |
             core.setFailed('The test did not fail as expected.')
@@ -44,7 +45,7 @@ jobs:
     name: "Testing on a branch that used to exist"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - uses: ./
         id: inactive_url
@@ -53,11 +54,11 @@ jobs:
           PLATFORMSH_ID: ${{ secrets.TEST_PLATFORMSH_ID }}
           PLATFORMSH_KEY: ${{ secrets.TEST_PLATFORMSH_KEY }}
           ENVIRONMENT_NAME: pr-462
-          DEPLOY_WAIT_TIME: 30
+          PSH_DETECTION_WAIT: 30
 
       - name: Check for failure
         if: ${{ steps.inactive_url.outcome != 'failure' }}
-        uses: actions/github-script@v3
+        uses: actions/github-script@v7
         with:
           script: |
             core.setFailed('The test did not fail as expected.')
diff --git a/.yamllint b/.yamllint
new file mode 100644
index 0000000..7e0c742
--- /dev/null
+++ b/.yamllint
@@ -0,0 +1,14 @@
+---
+extends: default
+
+rules:
+  indentation:
+    spaces: 2
+  line-length: disable
+  truthy:
+    check-keys: false
+  braces:
+    min-spaces-inside: 1
+    max-spaces-inside: 1
+    min-spaces-inside-empty: 0
+    max-spaces-inside-empty: 0
diff --git a/README.md b/README.md
index 2ee986f..0bedfec 100644
--- a/README.md
+++ b/README.md
@@ -1,24 +1,29 @@
 # action-platformsh-url
 
-Detecting if PlatformSH is building an environment, and returning the URL when it's done deploying.
+Detecting if PlatformSH is building an environment, and returning the
+URL when it's done deploying.
 
 ## Inputs
 
 - `PLATFORMSH_ID`: The ID of your platform project.
 - `PLATFORMSH_KEY`: The API token, generated through PlatformSH.
-	- Login to [console.platform.sh](https://console.platform.sh)
-	- "My Profile" > "API Tokens" > "Create API token"
-	- Remember that this is an access token, and **should not be written in plain text.**
-	- Add it as an encrypted repo secret - [more info at GitHub docs](https://docs.github.com/en/actions/security-guides/encrypted-secrets#creating-encrypted-secrets-for-a-repository).
+  - Login to [console.platform.sh](https://console.platform.sh)
+  - "My Profile" > "API Tokens" > "Create API token"
+  - Remember that this is an access token, and **should not be written
+    in plain text.**
+  - Add it as an encrypted repo secret - [more info at GitHub
+    docs](https://docs.github.com/en/actions/security-guides/encrypted-secrets#creating-encrypted-secrets-for-a-repository).
 - `ENVIRONMENT_NAME` (optional): The environment, to check for
-	- By default, this is set to the `pr-xx`, using `pr-${{ github.event.pull_request.number }}`
-	- You can also set it to check for the current branch, using `${{ github.head_ref || github.ref_name }}`
+  - By default, this is set to the `pr-xx`, using `pr-${{
+    github.event.pull_request.number }}`
+  - You can also set it to check for the current branch, using `${{
+    github.head_ref || github.ref_name }}`
 
 See the other inputs in [action.yml](action.yml)
 
 ## See also
 
-This action is used for another action, for detecting if a platformsh environment has deployed correctly.
-
-https://github.com/rasben/action-platformsh-deploy-status
+This action is used for another action, for detecting if a platformsh
+environment has deployed correctly.
 
+<https://github.com/rasben/action-platformsh-deploy-status>
diff --git a/action.yml b/action.yml
index cab3564..0786ff4 100644
--- a/action.yml
+++ b/action.yml
@@ -1,3 +1,4 @@
+---
 name: "Platform.sh - Get Environment URL"
 description: "Detecting if PlatformSH is building an environment, and returning the URL when it's done deploying."
 branding:
@@ -47,11 +48,6 @@ outputs:
 runs:
   using: "composite"
   steps:
-    - name: Setup PHP and disable opcache
-      uses: shivammathur/setup-php@v2
-      with:
-        php-version: "8.1"
-        extensions: none, curl, json, mbstring, pcre, phar
     - name: Get PlatformSH URL
       shell: bash
       id: platformsh_url
@@ -65,7 +61,7 @@ runs:
         export PLATFORM_BRANCH=${{ inputs.ENVIRONMENT_NAME }};
         export PLATFORMSH_CLI_TOKEN=${{ inputs.PLATFORMSH_KEY }};
 
-        curl -fsS https://platform.sh/cli/installer | php
+        curl -fsSL https://raw.githubusercontent.com/platformsh/cli/main/installer.sh | bash
 
         if [[ "${{ inputs.ALLOW_CANCEL_CRON }}" == 1 ]]; then \
             ~/.platformsh/bin/platform activity:cancel --type=environment.cron; \