diff --git a/composer.json b/composer.json
index 059a81e..3e039bc 100755
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
         "friendsofphp/php-cs-fixer": "dev-master@dev",
         "phpmd/phpmd": "2.9.0",
         "phpmetrics/phpmetrics": "dev-master@dev",
-        "phpstan/phpstan": "0.12.11",
+        "phpstan/phpstan": "0.12.99",
         "phpunit/phpunit": "*",
         "squizlabs/php_codesniffer": "3.5.6",
         "symfony/yaml": "~2.1|~3.0|~4.0"
diff --git a/src/Observer/ObserverTime.php b/src/Observer/ObserverTime.php
index b73e70f..9dfc031 100644
--- a/src/Observer/ObserverTime.php
+++ b/src/Observer/ObserverTime.php
@@ -18,7 +18,7 @@ class ObserverTime
      * ΔT is the difference between the Earth rotation time and the Terrestrial Time (TT).
      * It is derived from observation only and reported yearly in the Astronomical Almanac.
      *
-     * @param float $ΔT
+     * @param  float  $ΔT
      */
     public $ΔT = 0;
     public $JulianEphemerisDay = 0;