diff --git a/.github/workflows/php-dev.yml b/.github/workflows/php-dev.yml
index d7b74d3c..28a9ae8f 100644
--- a/.github/workflows/php-dev.yml
+++ b/.github/workflows/php-dev.yml
@@ -38,7 +38,8 @@ jobs:
           - "8.1" # highest supported
           - "8.0"
           - "7.4"
-          - "7.3" # lowest supported
+          ## below is a list of versions the project supports on runtime - but not on dev-time
+          # - "7.3" # lowest supported
     timeout-minutes: 30
     steps:
       - name: Checkout
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 273e34f5..66fbd5e8 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -4,6 +4,9 @@ Feel free to open pull requests.
 
 ## Setup 
 
+The development-setup requires PHP >= 7.4,
+even though the project might support PHP 7.3 on runtime.
+
 To start developing simply run `composer run-script dev-setup` to install dev-dependencies and tools.
 
 ## Tests
diff --git a/tools/composer-require-checker/composer.json b/tools/composer-require-checker/composer.json
index 884249f4..42e29272 100644
--- a/tools/composer-require-checker/composer.json
+++ b/tools/composer-require-checker/composer.json
@@ -3,7 +3,7 @@
     "type": "metapackage",
     "description": "composer-require-checker",
     "require-dev": {
-        "maglnet/composer-require-checker": "^3.5 || 2.1.0 || 2.0.0",
+        "maglnet/composer-require-checker": "3.8.0",
         "roave/security-advisories": "dev-latest"
     },
     "config": {