diff --git a/.travis.yml b/.travis.yml
index ac06c064..ebc1249c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,7 +16,7 @@ matrix:
       env:
         - COLLECT_COVERAGE=true
         - IGNORE_PLATFORMS=false
-        - RUN_PHPSTAN=false
+        - RUN_PHPSTAN=true
         - RUN_INFECTION=false
         - VALIDATE_CODING_STYLE=false
     - php: 7.2
@@ -30,7 +30,7 @@ matrix:
       env:
         - COLLECT_COVERAGE=true
         - IGNORE_PLATFORMS=true
-        - RUN_PHPSTAN=false
+        - RUN_PHPSTAN=true
         - RUN_INFECTION=false
         - VALIDATE_CODING_STYLE=false
     - php: nightly
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5c5d2b3b..4b72279c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 All Notable changes to `Period` will be documented in this file
 
-## Next - TBD
+## 4.3.1 - 2019-01-07
 
 ### Added
 
@@ -10,7 +10,7 @@ All Notable changes to `Period` will be documented in this file
 
 ### Fixed
 
-- None
+- `Datepoint::createFromFormat` see issue [#72](https://github.com/thephpleague/period/issues/72)
 
 ### Deprecated
 
diff --git a/composer.json b/composer.json
index d0413d0a..bfec9a81 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
         "issues": "https://github.com/thephpleague/period/issues"
     },
     "require": {
-        "php" : ">=7.1.3"
+        "php" : "^7.1.3"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^2.0",
@@ -50,9 +50,9 @@
         "phpunit": "phpunit --coverage-text",
         "infection": "infection -j$(nproc) --coverage=build --ignore-msi-with-no-mutations",
         "test": [
+            "@phpcs",
             "@phpstan-src",
             "@phpstan-tests",
-            "@phpcs",
             "@phpunit",
             "@infection"
         ]
diff --git a/src/Datepoint.php b/src/Datepoint.php
index e88e433c..4fec7e31 100644
--- a/src/Datepoint.php
+++ b/src/Datepoint.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * League.Period (https://period.thephpleague.com).
+ * League.Period (https://period.thephpleague.com)
  *
  * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
  *
@@ -59,12 +59,13 @@ public static function create($datepoint): self
     /**
      * @inheritdoc
      *
-     * @param string $format
-     * @param string $datetime
+     * @param string       $format
+     * @param string       $datetime
+     * @param DateTimeZone $timezone
      *
      * @return self|bool
      */
-    public static function createFromFormat($format, $datetime, DateTimeZone $timezone = null)
+    public static function createFromFormat($format, $datetime, $timezone = null)
     {
         $datepoint = parent::createFromFormat($format, $datetime, $timezone);
         if (false !== $datepoint) {
diff --git a/src/Duration.php b/src/Duration.php
index fa6bc7a3..ce4fc83e 100644
--- a/src/Duration.php
+++ b/src/Duration.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * League.Period (https://period.thephpleague.com).
+ * League.Period (https://period.thephpleague.com)
  *
  * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
  *
diff --git a/src/Exception.php b/src/Exception.php
index 9f1c9c60..8bc4f031 100644
--- a/src/Exception.php
+++ b/src/Exception.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * League.Period (https://period.thephpleague.com).
+ * League.Period (https://period.thephpleague.com)
  *
  * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
  *
diff --git a/src/InvalidIndex.php b/src/InvalidIndex.php
index ba842735..740fb023 100644
--- a/src/InvalidIndex.php
+++ b/src/InvalidIndex.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * League.Period (https://period.thephpleague.com).
+ * League.Period (https://period.thephpleague.com)
  *
  * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
  *
diff --git a/src/Period.php b/src/Period.php
index 9af99b70..a2678937 100644
--- a/src/Period.php
+++ b/src/Period.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * League.Period (https://period.thephpleague.com).
+ * League.Period (https://period.thephpleague.com)
  *
  * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
  *
diff --git a/src/Sequence.php b/src/Sequence.php
index 3d572648..6738449c 100644
--- a/src/Sequence.php
+++ b/src/Sequence.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * League.Period (https://period.thephpleague.com).
+ * League.Period (https://period.thephpleague.com)
  *
  * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
  *
diff --git a/src/functions.php b/src/functions.php
index e1edc5a6..25a52ac2 100644
--- a/src/functions.php
+++ b/src/functions.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * League.Period (https://period.thephpleague.com).
+ * League.Period (https://period.thephpleague.com)
  *
  * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
  *
diff --git a/src/functions_include.php b/src/functions_include.php
index 9ceb04f5..d4c23008 100644
--- a/src/functions_include.php
+++ b/src/functions_include.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * League.Period (https://period.thephpleague.com).
+ * League.Period (https://period.thephpleague.com)
  *
  * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
  *
diff --git a/tests/DatepointTest.php b/tests/DatepointTest.php
index 3aa21537..593f902d 100644
--- a/tests/DatepointTest.php
+++ b/tests/DatepointTest.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * League.Period (https://period.thephpleague.com).
+ * League.Period (https://period.thephpleague.com)
  *
  * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
  *
diff --git a/tests/DurationTest.php b/tests/DurationTest.php
index 1462092d..8c679127 100644
--- a/tests/DurationTest.php
+++ b/tests/DurationTest.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * League.Period (https://period.thephpleague.com).
+ * League.Period (https://period.thephpleague.com)
  *
  * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
  *
diff --git a/tests/ExtendedDate.php b/tests/ExtendedDate.php
index 4968b949..8314a3da 100644
--- a/tests/ExtendedDate.php
+++ b/tests/ExtendedDate.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * League.Period (https://period.thephpleague.com).
+ * League.Period (https://period.thephpleague.com)
  *
  * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
  *
diff --git a/tests/FunctionTest.php b/tests/FunctionTest.php
index 2bd292b2..d3c389a8 100644
--- a/tests/FunctionTest.php
+++ b/tests/FunctionTest.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * League.Period (https://period.thephpleague.com).
+ * League.Period (https://period.thephpleague.com)
  *
  * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
  *
diff --git a/tests/PeriodTest.php b/tests/PeriodTest.php
index 8c94ea1c..8e7ca9b9 100644
--- a/tests/PeriodTest.php
+++ b/tests/PeriodTest.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * League.Period (https://period.thephpleague.com).
+ * League.Period (https://period.thephpleague.com)
  *
  * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
  *
diff --git a/tests/SequenceTest.php b/tests/SequenceTest.php
index 0c25b325..86d8a339 100644
--- a/tests/SequenceTest.php
+++ b/tests/SequenceTest.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * League.Period (https://period.thephpleague.com).
+ * League.Period (https://period.thephpleague.com)
  *
  * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
  *