diff --git a/.travis.yml b/.travis.yml
index bdd2e2f..fdc6ff5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,12 +1,12 @@
 language: php
 
 php:
-  - 5.4
-  - 5.5
   - 5.6
   - 7.0
   - 7.1
   - 7.2
+  - 7.3
+  - 7.4
 
 before_script:
   - composer install
diff --git a/README.md b/README.md
index 073f464..3574ae9 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ PHP library for [two-factor (or multi-factor) authentication](http://en.wikipedi
 
 ## Requirements
 
-* Tested on PHP 5.4 up to 7.2
+* Tested on PHP 5.6 up to 7.4
 * [cURL](http://php.net/manual/en/book.curl.php) when using the provided `ImageChartsQRCodeProvider` (default), `QRServerProvider` or `QRicketProvider` but you can also provide your own QR-code provider.
 * [random_bytes()](http://php.net/manual/en/function.random-bytes.php), [MCrypt](http://php.net/manual/en/book.mcrypt.php), [OpenSSL](http://php.net/manual/en/book.openssl.php) or [Hash](http://php.net/manual/en/book.hash.php) depending on which built-in RNG you use (TwoFactorAuth will try to 'autodetect' and use the best available); however: feel free to provide your own (CS)RNG.