diff --git a/.env b/.env
index 2d9ff85..287ea18 100644
--- a/.env
+++ b/.env
@@ -1,3 +1,3 @@
-PHP_BASE_IMAGE=php:7.3-rc-cli
+PHP_BASE_IMAGE=php:7.2-cli
 PHP_IMAGE=homepage-php
 NODE_IMAGE=node:10
diff --git a/composer.lock b/composer.lock
index 2d6c936..5c946ea 100644
--- a/composer.lock
+++ b/composer.lock
@@ -71,16 +71,16 @@
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-            "time": "2018-04-11T15:42:36+00:00"
+            "time": "2018-08-31T19:07:57+00:00"
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@@ -682,21 +682,21 @@
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+            "version": "v2.13.0",
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@@ -738,6 +738,11 @@
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@@ -769,7 +774,7 @@
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-            "time": "2018-07-06T10:37:40+00:00"
+            "time": "2018-08-23T13:15:44+00:00"
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@@ -960,33 +965,29 @@
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+                "php": "^7"
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-                "phpunit/phpunit": "4.*|5.*"
+                "phpunit/phpunit": "4.*|5.*",
+                "vimeo/psalm": "^1"
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@@ -1005,7 +1006,7 @@
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-            "time": "2018-07-04T16:31:37+00:00"
+            "time": "2018-07-02T15:55:56+00:00"
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@@ -1623,16 +1624,16 @@
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-                "reference": "77454693d8f10dd23bb24955cffd2d82db1007a6"
+                "reference": "1e24b0c4a56d55aaf368763a06c6d1c7d3194934"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-php70/zipball/77454693d8f10dd23bb24955cffd2d82db1007a6",
-                "reference": "77454693d8f10dd23bb24955cffd2d82db1007a6",
+                "url": "https://api.github.com/repos/symfony/polyfill-php70/zipball/1e24b0c4a56d55aaf368763a06c6d1c7d3194934",
+                "reference": "1e24b0c4a56d55aaf368763a06c6d1c7d3194934",
                 "shasum": ""
             },
             "require": {
-                "paragonie/random_compat": "~1.0|~2.0",
+                "paragonie/random_compat": "~1.0|~2.0|~9.99",
                 "php": ">=5.3.3"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.8-dev"
+                    "dev-master": "1.9-dev"
                 }
             },
             "autoload": {
@@ -2411,20 +2415,20 @@
                 "portable",
                 "shim"
             ],
-            "time": "2018-04-26T10:06:28+00:00"
+            "time": "2018-08-06T14:22:27+00:00"
         },
         {
             "name": "symfony/polyfill-php72",
-            "version": "v1.8.0",
+            "version": "v1.9.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-php72.git",
-                "reference": "a4576e282d782ad82397f3e4ec1df8e0f0cafb46"
+                "reference": "95c50420b0baed23852452a7f0c7b527303ed5ae"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-php72/zipball/a4576e282d782ad82397f3e4ec1df8e0f0cafb46",
-                "reference": "a4576e282d782ad82397f3e4ec1df8e0f0cafb46",
+                "url": "https://api.github.com/repos/symfony/polyfill-php72/zipball/95c50420b0baed23852452a7f0c7b527303ed5ae",
+                "reference": "95c50420b0baed23852452a7f0c7b527303ed5ae",
                 "shasum": ""
             },
             "require": {
@@ -2433,7 +2437,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.8-dev"
+                    "dev-master": "1.9-dev"
                 }
             },
             "autoload": {
@@ -2466,20 +2470,20 @@
                 "portable",
                 "shim"
             ],
-            "time": "2018-04-26T10:06:28+00:00"
+            "time": "2018-08-06T14:22:27+00:00"
         },
         {
             "name": "symfony/process",
-            "version": "v3.4.12",
+            "version": "v3.4.15",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/process.git",
-                "reference": "acc5a37c706ace827962851b69705b24e71ca17c"
+                "reference": "4d6b125d5293cbceedc2aa10f2c71617e76262e7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/process/zipball/acc5a37c706ace827962851b69705b24e71ca17c",
-                "reference": "acc5a37c706ace827962851b69705b24e71ca17c",
+                "url": "https://api.github.com/repos/symfony/process/zipball/4d6b125d5293cbceedc2aa10f2c71617e76262e7",
+                "reference": "4d6b125d5293cbceedc2aa10f2c71617e76262e7",
                 "shasum": ""
             },
             "require": {
@@ -2515,20 +2519,20 @@
             ],
             "description": "Symfony Process Component",
             "homepage": "https://symfony.com",
-            "time": "2018-05-30T04:24:30+00:00"
+            "time": "2018-08-03T10:42:44+00:00"
         },
         {
             "name": "symfony/stopwatch",
-            "version": "v4.1.1",
+            "version": "v4.1.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/stopwatch.git",
-                "reference": "07463bbbbbfe119045a24c4a516f92ebd2752784"
+                "reference": "966c982df3cca41324253dc0c7ffe76b6076b705"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/stopwatch/zipball/07463bbbbbfe119045a24c4a516f92ebd2752784",
-                "reference": "07463bbbbbfe119045a24c4a516f92ebd2752784",
+                "url": "https://api.github.com/repos/symfony/stopwatch/zipball/966c982df3cca41324253dc0c7ffe76b6076b705",
+                "reference": "966c982df3cca41324253dc0c7ffe76b6076b705",
                 "shasum": ""
             },
             "require": {
@@ -2564,20 +2568,20 @@
             ],
             "description": "Symfony Stopwatch Component",
             "homepage": "https://symfony.com",
-            "time": "2018-02-19T16:51:42+00:00"
+            "time": "2018-07-26T11:00:49+00:00"
         },
         {
             "name": "symfony/yaml",
-            "version": "v3.4.12",
+            "version": "v3.4.15",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "c5010cc1692ce1fa328b1fb666961eb3d4a85bb0"
+                "reference": "c2f4812ead9f847cb69e90917ca7502e6892d6b8"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/c5010cc1692ce1fa328b1fb666961eb3d4a85bb0",
-                "reference": "c5010cc1692ce1fa328b1fb666961eb3d4a85bb0",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/c2f4812ead9f847cb69e90917ca7502e6892d6b8",
+                "reference": "c2f4812ead9f847cb69e90917ca7502e6892d6b8",
                 "shasum": ""
             },
             "require": {
@@ -2623,28 +2627,28 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2018-05-03T23:18:14+00:00"
+            "time": "2018-08-10T07:34:36+00:00"
         },
         {
             "name": "twig/extensions",
-            "version": "v1.5.1",
+            "version": "v1.5.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/twigphp/Twig-extensions.git",
-                "reference": "d188c76168b853481cc75879ea045bf93d718e9c"
+                "reference": "2c1a86526d0044065220d1b51ac08348bea5ca82"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/twigphp/Twig-extensions/zipball/d188c76168b853481cc75879ea045bf93d718e9c",
-                "reference": "d188c76168b853481cc75879ea045bf93d718e9c",
+                "url": "https://api.github.com/repos/twigphp/Twig-extensions/zipball/2c1a86526d0044065220d1b51ac08348bea5ca82",
+                "reference": "2c1a86526d0044065220d1b51ac08348bea5ca82",
                 "shasum": ""
             },
             "require": {
-                "twig/twig": "~1.27|~2.0"
+                "twig/twig": "^1.27|^2.0"
             },
             "require-dev": {
-                "symfony/phpunit-bridge": "~3.3@dev",
-                "symfony/translation": "~2.3|~3.0"
+                "symfony/phpunit-bridge": "^3.4",
+                "symfony/translation": "^2.7|^3.4"
             },
             "suggest": {
                 "symfony/translation": "Allow the time_diff output to be translated"
@@ -2674,12 +2678,11 @@
                 }
             ],
             "description": "Common additional features for Twig that do not directly belong in core",
-            "homepage": "http://twig.sensiolabs.org/doc/extensions/index.html",
             "keywords": [
                 "i18n",
                 "text"
             ],
-            "time": "2017-06-08T18:19:53+00:00"
+            "time": "2018-05-22T13:26:07+00:00"
         },
         {
             "name": "twig/twig",
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 7072f62..a1f843e 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -12,11 +12,11 @@ RUN apt-get update \
     && rm -rf /var/lib/apt/lists/*
 
 # get composer and required tools
-RUN curl -sLO https://getcomposer.org/download/1.6.5/composer.phar \
+RUN curl -sLO https://getcomposer.org/download/1.7.2/composer.phar \
     && mv composer.phar /usr/local/bin/composer \
     && chmod +x /usr/local/bin/composer
 
 # Deployer
-RUN curl -sLO https://deployer.org/releases/v6.2.0/deployer.phar \
+RUN curl -sLO https://deployer.org/releases/v6.3.0/deployer.phar \
     && mv deployer.phar /usr/local/bin/dep \
     && chmod +x /usr/local/bin/dep