diff --git a/.travis.yml b/.travis.yml
index 21db732da4..0e186dc8c7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -26,20 +26,8 @@ matrix:
   - php: 7.0
     env: WP_TEST_REPORTER=true
   - php: 5.6
-  - php: 5.5
-  - php: 5.4
-  - php: 5.3
-    dist: precise
-  - php: 5.2
-    dist: precise
   - php: nightly
   allow_failures:
-  - php: 5.5
-  - php: 5.4
-  - php: 5.3
-    dist: precise
-  - php: 5.2
-    dist: precise
   - php: 7.4snapshot
   - php: nightly
   fast_finish: true
@@ -68,10 +56,8 @@ before_script:
   fi
 - |
   # Export Composer's global bin dir to PATH, but not on PHP 5.2:
-  if [[ ${TRAVIS_PHP_VERSION:0:3} != "5.2" ]]; then
-    composer config --list --global
-    export PATH=`composer config --list --global | grep '\[home\]' | { read a; echo "${a#* }/vendor/bin:$PATH"; }`
-  fi
+  composer config --list --global
+  export PATH=`composer config --list --global | grep '\[home\]' | { read a; echo "${a#* }/vendor/bin:$PATH"; }`
 - |
   # Install the specified version of PHPUnit depending on the PHP version:
   if [[ "$WP_TRAVISCI" == "travis:phpunit" ]]; then
@@ -84,14 +70,10 @@ before_script:
         echo "Using PHPUnit 6.x"
         travis_retry composer global require "phpunit/phpunit:^6"
         ;;
-      5.6|5.5|5.4|5.3)
+      5.6)
         echo "Using PHPUnit 4.x"
         travis_retry composer global require "phpunit/phpunit:^4"
         ;;
-      5.2)
-        # Do nothing, use default PHPUnit 3.6.x
-        echo "Using default PHPUnit, hopefully 3.6"
-        ;;
       *)
         echo "No PHPUnit version handling for PHP version $TRAVIS_PHP_VERSION"
         exit 1
diff --git a/src/readme.html b/src/readme.html
index 10dcfd1c04..37e1a8aee1 100644
--- a/src/readme.html
+++ b/src/readme.html
@@ -52,13 +52,13 @@
 
 <h2>System Requirements</h2>
 <ul>
-	<li><a href="https://secure.php.net/">PHP</a> version <strong>5.6.30</strong> or higher.</li>
+	<li><a href="https://secure.php.net/">PHP</a> version <strong>5.6.20</strong> or higher.</li>
 	<li><a href="https://www.mysql.com/">MySQL</a> version <strong>5.0</strong> or higher.</li>
 </ul>
 
 <h3>Recommendations</h3>
 <ul>
-	<li><a href="https://secure.php.net/">PHP</a> version <strong>7.2</strong> or higher.</li>
+	<li><a href="https://secure.php.net/">PHP</a> version <strong>7.3</strong> or higher.</li>
 	<li><a href="https://www.mysql.com/">MySQL</a> version <strong>5.6</strong> or higher.</li>
 	<li>The <a href="https://httpd.apache.org/docs/2.2/mod/mod_rewrite.html">mod_rewrite</a> Apache module.</li>
 	<li><a href="https://wordpress.org/news/2016/12/moving-toward-ssl/">HTTPS</a> support.</li>
diff --git a/src/wp-includes/version.php b/src/wp-includes/version.php
index 052ea37033..c66df10573 100644
--- a/src/wp-includes/version.php
+++ b/src/wp-includes/version.php
@@ -34,7 +34,7 @@ $tinymce_version = '4920-20181217';
  *
  * @global string $required_php_version
  */
-$required_php_version = '5.6.30';
+$required_php_version = '5.6.20';
 
 /**
  * Holds the required MySQL version