diff --git a/.travis.yml b/.travis.yml
index 9b2dc3e024dd965523b8a18ae8607d1d117893c0..3a562dfd19360ce62320132eb6e04c4ef94f8376 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,17 +14,13 @@ cache:
 
 matrix:
   include:
+    - php: nightly
+      env: WP_VERSION=latest
     - php: 7.1
       env: WP_VERSION=latest
     - php: 7.0
       env: WP_VERSION=latest
-    - php: 5.6
-      env: WP_VERSION=4.4
-    - php: 5.6
-      env: WP_VERSION=latest
-    - php: 5.6
-      env: WP_VERSION=trunk
-    - php: 5.6
+    - php: 7.1
       env: WP_TRAVISCI=phpcs
 
 before_script:
diff --git a/README.md b/README.md
index 8ab7fa5f76522bd0e25d19a1488f1afa132266a8..1f8a4c0127a3d6dccf48f3855d6b65ab243c1a67 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 **Tags:** wp-cli, cli, cron, cron control  
 **Requires at least:** 4.8.1  
 **Tested up to:** 4.9  
-**Requires PHP:** 5.6  
+**Requires PHP:** 7.0  
 **Stable tag:** 0.1.0  
 **License:** GPLv2 or later  
 **License URI:** http://www.gnu.org/licenses/gpl-2.0.html  
@@ -23,6 +23,10 @@ Provides a WP-CLI command to schedule these events. A UI is under consideration.
 
 ## Frequently Asked Questions ##
 
+### Why is PHP 7 required? ###
+
+To support arrays in constants set using `define()`, PHP 7 is required. These are used to set whitelists and blacklists, though filters are also provided; see below.
+
 ### Does this support custom WP-CLI commands? ###
 
 Yes. By default, no restrictions are placed on what commands are supported, as those restrictions depend on the environment where this plugin is used. That said, see the following sections regarding support for whitelists and blacklists.
diff --git a/readme.txt b/readme.txt
index 4cd4e8e2a08f47c63328281b80171ba3239e98e0..89ea926d9e4b218ec643518d09a57b94e142ea68 100644
--- a/readme.txt
+++ b/readme.txt
@@ -3,7 +3,7 @@ Contributors: ethitter, automattic
 Tags: wp-cli, cli, cron, cron control
 Requires at least: 4.8.1
 Tested up to: 4.9
-Requires PHP: 5.6
+Requires PHP: 7.0
 Stable tag: 0.1.0
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
@@ -23,6 +23,10 @@ Provides a WP-CLI command to schedule these events. A UI is under consideration.
 
 == Frequently Asked Questions ==
 
+= Why is PHP 7 required? =
+
+To support arrays in constants set using `define()`, PHP 7 is required. These are used to set whitelists and blacklists, though filters are also provided; see below.
+
 = Does this support custom WP-CLI commands? =
 
 Yes. By default, no restrictions are placed on what commands are supported, as those restrictions depend on the environment where this plugin is used. That said, see the following sections regarding support for whitelists and blacklists.