diff --git a/.travis.yml b/.travis.yml
index a8dd1dfd8..5f0c53569 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,6 +19,7 @@ matrix:
         apt:
           packages:
             - libav-tools
+            - ghostscript
             - mongodb-org-server
           sources:
             - mongodb-upstart
@@ -28,6 +29,7 @@ matrix:
         apt:
           packages:
             - libav-tools
+            - ghostscript
             - mongodb-org-server
           sources:
             - mongodb-3.0-precise
diff --git a/composer.lock b/composer.lock
index 46ed03bb5..0c3638976 100644
--- a/composer.lock
+++ b/composer.lock
@@ -341,16 +341,16 @@
         },
         {
             "name": "composer/ca-bundle",
-            "version": "1.0.7",
+            "version": "1.0.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/ca-bundle.git",
-                "reference": "b17e6153cb7f33c7e44eb59578dc12eee5dc8e12"
+                "reference": "9dd73a03951357922d8aee6cc084500de93e2343"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/ca-bundle/zipball/b17e6153cb7f33c7e44eb59578dc12eee5dc8e12",
-                "reference": "b17e6153cb7f33c7e44eb59578dc12eee5dc8e12",
+                "url": "https://api.github.com/repos/composer/ca-bundle/zipball/9dd73a03951357922d8aee6cc084500de93e2343",
+                "reference": "9dd73a03951357922d8aee6cc084500de93e2343",
                 "shasum": ""
             },
             "require": {
@@ -396,7 +396,7 @@
                 "ssl",
                 "tls"
             ],
-            "time": "2017-03-06T11:59:08+00:00"
+            "time": "2017-09-11T07:24:36+00:00"
         },
         {
             "name": "doctrine/annotations",
@@ -4585,16 +4585,16 @@
         },
         {
             "name": "symfony/symfony",
-            "version": "v2.8.26",
+            "version": "v2.8.27",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/symfony.git",
-                "reference": "33553101754e0888a1a1fecc46d7a7f10f6f9580"
+                "reference": "d512cc1c2c418f42c07b82d8b029e7a487be007f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/symfony/zipball/33553101754e0888a1a1fecc46d7a7f10f6f9580",
-                "reference": "33553101754e0888a1a1fecc46d7a7f10f6f9580",
+                "url": "https://api.github.com/repos/symfony/symfony/zipball/d512cc1c2c418f42c07b82d8b029e7a487be007f",
+                "reference": "d512cc1c2c418f42c07b82d8b029e7a487be007f",
                 "shasum": ""
             },
             "require": {
@@ -4719,7 +4719,7 @@
             "keywords": [
                 "framework"
             ],
-            "time": "2017-08-01T09:05:29+00:00"
+            "time": "2017-08-28T19:21:56+00:00"
         },
         {
             "name": "twig/extensions",
@@ -5044,16 +5044,16 @@
         },
         {
             "name": "phpdocumentor/reflection-common",
-            "version": "1.0",
+            "version": "1.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
-                "reference": "144c307535e82c8fdcaacbcfc1d6d8eeb896687c"
+                "reference": "21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/144c307535e82c8fdcaacbcfc1d6d8eeb896687c",
-                "reference": "144c307535e82c8fdcaacbcfc1d6d8eeb896687c",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6",
+                "reference": "21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6",
                 "shasum": ""
             },
             "require": {
@@ -5094,7 +5094,7 @@
                 "reflection",
                 "static analysis"
             ],
-            "time": "2015-12-27T11:43:31+00:00"
+            "time": "2017-09-11T18:02:19+00:00"
         },
         {
             "name": "phpdocumentor/reflection-docblock",
@@ -5190,22 +5190,22 @@
         },
         {
             "name": "phpspec/prophecy",
-            "version": "v1.7.0",
+            "version": "v1.7.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "93d39f1f7f9326d746203c7c056f300f7f126073"
+                "reference": "c9b8c6088acd19d769d4cc0ffa60a9fe34344bd6"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/93d39f1f7f9326d746203c7c056f300f7f126073",
-                "reference": "93d39f1f7f9326d746203c7c056f300f7f126073",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/c9b8c6088acd19d769d4cc0ffa60a9fe34344bd6",
+                "reference": "c9b8c6088acd19d769d4cc0ffa60a9fe34344bd6",
                 "shasum": ""
             },
             "require": {
                 "doctrine/instantiator": "^1.0.2",
                 "php": "^5.3|^7.0",
-                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2",
+                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2|^4.0",
                 "sebastian/comparator": "^1.1|^2.0",
                 "sebastian/recursion-context": "^1.0|^2.0|^3.0"
             },
@@ -5216,7 +5216,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.6.x-dev"
+                    "dev-master": "1.7.x-dev"
                 }
             },
             "autoload": {
@@ -5249,7 +5249,7 @@
                 "spy",
                 "stub"
             ],
-            "time": "2017-03-02T20:05:34+00:00"
+            "time": "2017-09-04T11:05:03+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",