diff --git a/.github/workflows/refresh-php8.yml b/.github/workflows/refresh-php8.yml
deleted file mode 100644
index 2c00e45e..00000000
--- a/.github/workflows/refresh-php8.yml
+++ /dev/null
@@ -1,37 +0,0 @@
-name: Refresh PHP 8 branch
-
-on:
-  push:
-    branches: [ master ]
-  schedule:
-      - cron: '42 2 * * *'
-  workflow_dispatch:
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Checkout php8 branch
-        uses: actions/checkout@v3
-        with:
-          # directly checkout the php8 branch
-          ref: php8
-          # Number of commits to fetch. 0 indicates all history for all branches and tags.
-          # Default: 1
-          fetch-depth: 0
-
-      - name: Merge master changes into php8
-        run: |
-          git config user.name "github-actions[bot]"
-          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
-          git merge origin/master
-
-      - name: Push new changes
-        uses: github-actions-x/commit@v2.9
-        with:
-          name: github-actions[bot]
-          email: 41898282+github-actions[bot]@users.noreply.github.com
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          push-branch: 'php8'
-
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3e071b05..90067847 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
 # PrivateBin version history
 
+  * **1.6.0 (not yet released)**
+    * CHANGED: Minimum required PHP version is 7.3, due to upgrading PHPunit (#707)
   * **1.5.2 (2023-07-09)**
     * ADDED: Allow AWS SDK to use default credential provider chain for S3Storage (#1070)
     * CHANGED: Upgrading libraries to: DOMpurify 3.0.4 & jQuery 3.7.0
diff --git a/lib/Controller.php b/lib/Controller.php
index 3ab8d7e8..bb5450ca 100644
--- a/lib/Controller.php
+++ b/lib/Controller.php
@@ -35,7 +35,7 @@ class Controller
      *
      * @const string
      */
-    const MIN_PHP_VERSION = '5.6.0';
+    const MIN_PHP_VERSION = '7.3.0';
 
     /**
      * show the same error message if the paste expired or does not exist