diff --git a/composer.json b/composer.json
index b5706246..9a8d2fc4 100644
--- a/composer.json
+++ b/composer.json
@@ -29,7 +29,7 @@
     "ergebnis/php-cs-fixer-config": "~1.1.2",
     "ergebnis/phpstan-rules": "~0.14.2",
     "ergebnis/test-util": "~0.9.1",
-    "jangregor/phpstan-prophecy": "~0.5.1",
+    "jangregor/phpstan-prophecy": "~0.6.0",
     "phpstan/extension-installer": "^1.0.3",
     "phpstan/phpstan": "~0.12.3",
     "phpstan/phpstan-deprecation-rules": "~0.12.0",
diff --git a/composer.lock b/composer.lock
index 8fa8cad4..8568f53c 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": "fd4665639155f1330b93efd12c0a31b2",
+    "content-hash": "25aae493f112fa04354b9373da8d74bb",
     "packages": [
         {
             "name": "ergebnis/composer-json-normalizer",
@@ -1144,16 +1144,16 @@
         },
         {
             "name": "jangregor/phpstan-prophecy",
-            "version": "0.5.1",
+            "version": "0.6.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/Jan0707/phpstan-prophecy.git",
-                "reference": "1c759a4d0df57820d52dfe56946eb9cdf455748c"
+                "reference": "542c8ed7228af772562fb0f370d15ec73e3bdecf"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/Jan0707/phpstan-prophecy/zipball/1c759a4d0df57820d52dfe56946eb9cdf455748c",
-                "reference": "1c759a4d0df57820d52dfe56946eb9cdf455748c",
+                "url": "https://api.github.com/repos/Jan0707/phpstan-prophecy/zipball/542c8ed7228af772562fb0f370d15ec73e3bdecf",
+                "reference": "542c8ed7228af772562fb0f370d15ec73e3bdecf",
                 "shasum": ""
             },
             "require": {
@@ -1165,8 +1165,8 @@
                 "phpunit/phpunit": "<6.0,>=9.0"
             },
             "require-dev": {
-                "friendsofphp/php-cs-fixer": "~2.15.0",
-                "localheinz/composer-normalize": "^1.1.3",
+                "ergebnis/composer-normalize": "^2.1.1",
+                "ergebnis/php-cs-fixer-config": "~1.1.2",
                 "phpspec/prophecy": "^1.7",
                 "phpunit/phpunit": "^6.0 || ^7.0"
             },
@@ -1199,7 +1199,7 @@
                 }
             ],
             "description": "Provides a phpstan/phpstan extension for phpspec/prophecy",
-            "time": "2019-12-13T22:11:10+00:00"
+            "time": "2019-12-27T23:57:21+00:00"
         },
         {
             "name": "myclabs/deep-copy",