diff --git a/composer.lock b/composer.lock
index b967eac..5b6c3b1 100644
--- a/composer.lock
+++ b/composer.lock
@@ -71,16 +71,16 @@
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@@ -580,21 +580,24 @@
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@@ -602,8 +605,8 @@
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+                "url": "https://api.github.com/repos/symfony/stopwatch/zipball/6b100e9309e8979cf1978ac1778eb155c1f7d93b",
+                "reference": "6b100e9309e8979cf1978ac1778eb155c1f7d93b",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1.3",
+                "symfony/service-contracts": "^1.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.3-dev"
                 }
             },
             "autoload": {
@@ -2793,20 +3035,20 @@
             ],
             "description": "Symfony Stopwatch Component",
             "homepage": "https://symfony.com",
-            "time": "2019-01-16T20:31:39+00:00"
+            "time": "2019-05-27T08:16:38+00:00"
         },
         {
             "name": "symfony/yaml",
-            "version": "v4.2.8",
+            "version": "v4.3.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "6712daf03ee25b53abb14e7e8e0ede1a770efdb1"
+                "reference": "c60ecf5ba842324433b46f58dc7afc4487dbab99"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/6712daf03ee25b53abb14e7e8e0ede1a770efdb1",
-                "reference": "6712daf03ee25b53abb14e7e8e0ede1a770efdb1",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/c60ecf5ba842324433b46f58dc7afc4487dbab99",
+                "reference": "c60ecf5ba842324433b46f58dc7afc4487dbab99",
                 "shasum": ""
             },
             "require": {
@@ -2825,7 +3067,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.2-dev"
+                    "dev-master": "4.3-dev"
                 }
             },
             "autoload": {
@@ -2852,7 +3094,7 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2019-03-30T15:58:42+00:00"
+            "time": "2019-04-06T14:04:46+00:00"
         },
         {
             "name": "twig/extensions",
@@ -2911,16 +3153,16 @@
         },
         {
             "name": "twig/twig",
-            "version": "v2.9.0",
+            "version": "v2.11.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/twigphp/Twig.git",
-                "reference": "82a1c055c8ed4c4705023bfd0405f3c74db6e3ae"
+                "reference": "84a463403da1c81afbcedda8f0e788c78bd25a79"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/twigphp/Twig/zipball/82a1c055c8ed4c4705023bfd0405f3c74db6e3ae",
-                "reference": "82a1c055c8ed4c4705023bfd0405f3c74db6e3ae",
+                "url": "https://api.github.com/repos/twigphp/Twig/zipball/84a463403da1c81afbcedda8f0e788c78bd25a79",
+                "reference": "84a463403da1c81afbcedda8f0e788c78bd25a79",
                 "shasum": ""
             },
             "require": {
@@ -2931,12 +3173,12 @@
             "require-dev": {
                 "psr/container": "^1.0",
                 "symfony/debug": "^2.7",
-                "symfony/phpunit-bridge": "^3.4.19|^4.1.8"
+                "symfony/phpunit-bridge": "^3.4.19|^4.1.8|^5.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.9-dev"
+                    "dev-master": "2.11-dev"
                 }
             },
             "autoload": {
@@ -2974,7 +3216,7 @@
             "keywords": [
                 "templating"
             ],
-            "time": "2019-04-28T06:57:38+00:00"
+            "time": "2019-06-05T11:17:07+00:00"
         },
         {
             "name": "webignition/disallowed-character-terminated-string",
diff --git a/docker/Dockerfile b/docker/Dockerfile
index e96d659..037e485 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -12,7 +12,7 @@ RUN apt-get update \
     && rm -rf /var/lib/apt/lists/*
 
 # get composer and required tools
-RUN curl -sLO https://getcomposer.org/download/1.8.5/composer.phar \
+RUN curl -sLO https://getcomposer.org/download/1.8.6/composer.phar \
     && mv composer.phar /usr/local/bin/composer \
     && chmod +x /usr/local/bin/composer