diff --git a/composer.lock b/composer.lock
index e382c70..ea2978c 100644
--- a/composer.lock
+++ b/composer.lock
@@ -518,23 +518,23 @@
         },
         {
             "name": "netresearch/jsonmapper",
-            "version": "v1.3.0",
+            "version": "v1.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/cweiske/jsonmapper.git",
-                "reference": "b94ffe5b237a697253f06f5a57d9b22292bfffb3"
+                "reference": "3868fe1128ce1169228acdb623359dca74db5ef3"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/cweiske/jsonmapper/zipball/b94ffe5b237a697253f06f5a57d9b22292bfffb3",
-                "reference": "b94ffe5b237a697253f06f5a57d9b22292bfffb3",
+                "url": "https://api.github.com/repos/cweiske/jsonmapper/zipball/3868fe1128ce1169228acdb623359dca74db5ef3",
+                "reference": "3868fe1128ce1169228acdb623359dca74db5ef3",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.6"
             },
             "require-dev": {
-                "phpunit/phpunit": "4.2.*",
+                "phpunit/phpunit": "~4.8.35 || ~5.7 || ~6.4",
                 "squizlabs/php_codesniffer": "~1.5"
             },
             "type": "library",
@@ -556,7 +556,7 @@
                 }
             ],
             "description": "Map nested JSON structures onto PHP classes",
-            "time": "2017-08-14T07:26:24+00:00"
+            "time": "2017-11-28T21:30:01+00:00"
         },
         {
             "name": "phpdocumentor/reflection-common",