diff --git a/.travis.yml b/.travis.yml
index 3fb2dce1..b9ad8de8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,8 +2,6 @@ language: php
 dist: trusty
 
 php:
-  - 5.6
-  - 7.0
   - 7.1
   - 7.2
   - 7.3
@@ -12,7 +10,6 @@ php:
 matrix:
   fast_finish: true
   allow_failures:
-    - php: 5.6
     - php: 7.4snapshot
 
 cache:
diff --git a/composer.json b/composer.json
index 6f9fd9c3..575fa08f 100644
--- a/composer.json
+++ b/composer.json
@@ -35,11 +35,11 @@
             "php-cs-fixer fix --ansi"
         ],
         "versions": [
-            "phpcs --report-width=200 samples/ src/ tests/ --ignore=samples/Header.php --standard=PHPCompatibility --runtime-set testVersion 5.6- -n"
+            "phpcs --report-width=200 samples/ src/ tests/ --ignore=samples/Header.php --standard=PHPCompatibility --runtime-set testVersion 7.1- -n"
         ]
     },
     "require": {
-        "php": "^5.6|^7.0",
+        "php": "^7.1",
         "ext-ctype": "*",
         "ext-dom": "*",
         "ext-gd": "*",
@@ -84,4 +84,4 @@
             "PhpOffice\\PhpSpreadsheetTests\\": "tests/PhpSpreadsheetTests"
         }
     }
-}
\ No newline at end of file
+}
diff --git a/composer.lock b/composer.lock
index a23c7f8d..6a4b2093 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "d70247696f417581626dde9641b53bdc",
+    "content-hash": "844c52e10f1e289de51d2b71cb7fc1ff",
     "packages": [
         {
             "name": "markbaker/complex",
@@ -3192,7 +3192,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": "^5.6|^7.0",
+        "php": "^7.1",
         "ext-ctype": "*",
         "ext-dom": "*",
         "ext-gd": "*",
@@ -3208,4 +3208,4 @@
         "ext-zlib": "*"
     },
     "platform-dev": []
-}
\ No newline at end of file
+}
diff --git a/docs/index.md b/docs/index.md
index be4e0fd0..7c276792 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -25,12 +25,9 @@ spreadsheet file formats, like Excel and LibreOffice Calc.
 
 ## Software requirements
 
-The following software is required to develop using PhpSpreadsheet:
-
--   PHP version 5.6 or newer
--   PHP extension php\_zip enabled
--   PHP extension php\_xml enabled
--   PHP extension php\_gd2 enabled (if not compiled in)
+PHP version 7.1 or newer to develop using PhpSpreadsheet. Other requirements, such as PHP extensions, are enforced by
+composer. See the `require` section of [the composer.json file](https://github.com/PHPOffice/PhpSpreadsheet/blob/master/composer.json)
+for details.
 
 ### PHP version support
 
diff --git a/samples/index.php b/samples/index.php
index ec100cf4..598caef4 100644
--- a/samples/index.php
+++ b/samples/index.php
@@ -3,7 +3,7 @@
 require_once 'Header.php';
 
 $requirements = [
-    'PHP 5.6.0' => version_compare(PHP_VERSION, '5.6.0', '>='),
+    'PHP 7.1.0' => version_compare(PHP_VERSION, '7.1.0', '>='),
     'PHP extension XML' => extension_loaded('xml'),
     'PHP extension xmlwriter' => extension_loaded('xmlwriter'),
     'PHP extension mbstring' => extension_loaded('mbstring'),
diff --git a/src/PhpSpreadsheet/Settings.php b/src/PhpSpreadsheet/Settings.php
index c297dd68..03fa6ac2 100644
--- a/src/PhpSpreadsheet/Settings.php
+++ b/src/PhpSpreadsheet/Settings.php
@@ -30,7 +30,6 @@ class Settings
      *      7.2 < 7.2.1
      *      7.1 < 7.1.13
      *      7.0 < 7.0.27
-     *      5.6 ANY
      * then you may need to disable this check to prevent unwanted behaviour in other threads
      * SECURITY WARNING: Changing this flag is not recommended.
      *
@@ -122,7 +121,6 @@ class Settings
      *      7.2 < 7.2.1
      *      7.1 < 7.1.13
      *      7.0 < 7.0.27
-     *      5.6 ANY
      * then you may need to disable this check to prevent unwanted behaviour in other threads
      * SECURITY WARNING: Changing this flag to false is not recommended.
      *
diff --git a/tests/PhpSpreadsheetTests/Cell/CoordinateTest.php b/tests/PhpSpreadsheetTests/Cell/CoordinateTest.php
index 5136226d..8d041c26 100644
--- a/tests/PhpSpreadsheetTests/Cell/CoordinateTest.php
+++ b/tests/PhpSpreadsheetTests/Cell/CoordinateTest.php
@@ -243,10 +243,6 @@ class CoordinateTest extends TestCase
     {
         $this->expectException(\TypeError::class);
 
-        if (PHP_MAJOR_VERSION < 7) {
-            $this->markTestSkipped('Cannot catch type hinting error with PHP 5.6');
-        }
-
         $cellRange = '';
         Coordinate::buildRange($cellRange);
     }