diff --git a/composer.json b/composer.json
index fe58f8b..0e570c8 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
     "source": "https://github.com/alphp/strftime"
   },
   "require": {
-    "php": ">=5.6.0",
+    "php": ">=7.1.0",
     "ext-intl" : "*"
   },
   "require-dev": {
diff --git a/tests/strftimeTest.php b/tests/strftimeTest.php
index 0db3e0f..7ba526f 100644
--- a/tests/strftimeTest.php
+++ b/tests/strftimeTest.php
@@ -190,16 +190,16 @@ public function testJulianCutover () {
       // 1st October 1582 in proleptic Gregorian is the same date as 21st September 1582 Julian
       $prolepticTimestamp = DateTimeImmutable::createFromFormat('Y-m-d|', '1582-10-01')->getTimestamp();
       $result = strftime('%x', $prolepticTimestamp, 'eu');
-      $this->assertEquals('82/10/1', $result);
+      $this->assertEquals('82/10/1', $result, '1st October 1582 in proleptic Gregorian is the same date as 21st September 1582 Julian');
 
       // In much of Europe, the 10th October 1582 never existed
       $prolepticTimestamp = DateTimeImmutable::createFromFormat('Y-m-d|', '1582-10-10')->getTimestamp();
       $result = strftime('%x', $prolepticTimestamp, 'eu');
-      $this->assertEquals('82/10/10', $result);
+      $this->assertEquals('82/10/10', $result, 'In much of Europe, the 10th October 1582 never existed');
 
       // The 15th October was the first day after the cutover, after which both systems agree
       $prolepticTimestamp = DateTimeImmutable::createFromFormat('Y-m-d|', '1582-10-15')->getTimestamp();
       $result = strftime('%x', $prolepticTimestamp, 'eu');
-      $this->assertEquals('82/10/15', $result);
+      $this->assertEquals('82/10/15', $result, 'The 15th October was the first day after the cutover, after which both systems agree');
     }
   }