diff --git a/.env b/.env
index 0a5cbad..55e3589 100644
--- a/.env
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diff --git a/composer.lock b/composer.lock
index 6281ceb..b69d00c 100644
--- a/composer.lock
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-                "reference": "7b4aab9743c30be783b73de055d24a39cf4b954f"
+                "reference": "34094cfa9abe1f0f14f48f490772db7a775559f2"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/7b4aab9743c30be783b73de055d24a39cf4b954f",
-                "reference": "7b4aab9743c30be783b73de055d24a39cf4b954f",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/34094cfa9abe1f0f14f48f490772db7a775559f2",
+                "reference": "34094cfa9abe1f0f14f48f490772db7a775559f2",
                 "shasum": ""
             },
             "require": {
@@ -2690,7 +2689,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.13-dev"
+                    "dev-master": "1.14-dev"
                 }
             },
             "autoload": {
@@ -2724,20 +2723,20 @@
                 "portable",
                 "shim"
             ],
-            "time": "2019-11-27T14:18:11+00:00"
+            "time": "2020-01-13T11:15:53+00:00"
         },
         {
             "name": "symfony/polyfill-php70",
-            "version": "v1.13.1",
+            "version": "v1.14.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-php70.git",
-                "reference": "af23c7bb26a73b850840823662dda371484926c4"
+                "reference": "419c4940024c30ccc033650373a1fe13890d3255"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-php70/zipball/af23c7bb26a73b850840823662dda371484926c4",
-                "reference": "af23c7bb26a73b850840823662dda371484926c4",
+                "url": "https://api.github.com/repos/symfony/polyfill-php70/zipball/419c4940024c30ccc033650373a1fe13890d3255",
+                "reference": "419c4940024c30ccc033650373a1fe13890d3255",
                 "shasum": ""
             },
             "require": {
@@ -2747,7 +2746,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.13-dev"
+                    "dev-master": "1.14-dev"
                 }
             },
             "autoload": {
@@ -2783,20 +2782,20 @@
                 "portable",
                 "shim"
             ],
-            "time": "2019-11-27T13:56:44+00:00"
+            "time": "2020-01-13T11:15:53+00:00"
         },
         {
             "name": "symfony/polyfill-php72",
-            "version": "v1.13.1",
+            "version": "v1.14.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-php72.git",
-                "reference": "66fea50f6cb37a35eea048d75a7d99a45b586038"
+                "reference": "46ecacf4751dd0dc81e4f6bf01dbf9da1dc1dadf"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-php72/zipball/66fea50f6cb37a35eea048d75a7d99a45b586038",
-                "reference": "66fea50f6cb37a35eea048d75a7d99a45b586038",
+                "url": "https://api.github.com/repos/symfony/polyfill-php72/zipball/46ecacf4751dd0dc81e4f6bf01dbf9da1dc1dadf",
+                "reference": "46ecacf4751dd0dc81e4f6bf01dbf9da1dc1dadf",
                 "shasum": ""
             },
             "require": {
@@ -2805,7 +2804,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.13-dev"
+                    "dev-master": "1.14-dev"
                 }
             },
             "autoload": {
@@ -2838,20 +2837,20 @@
                 "portable",
                 "shim"
             ],
-            "time": "2019-11-27T13:56:44+00:00"
+            "time": "2020-01-13T11:15:53+00:00"
         },
         {
             "name": "symfony/polyfill-php73",
-            "version": "v1.13.1",
+            "version": "v1.14.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-php73.git",
-                "reference": "4b0e2222c55a25b4541305a053013d5647d3a25f"
+                "reference": "5e66a0fa1070bf46bec4bea7962d285108edd675"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-php73/zipball/4b0e2222c55a25b4541305a053013d5647d3a25f",
-                "reference": "4b0e2222c55a25b4541305a053013d5647d3a25f",
+                "url": "https://api.github.com/repos/symfony/polyfill-php73/zipball/5e66a0fa1070bf46bec4bea7962d285108edd675",
+                "reference": "5e66a0fa1070bf46bec4bea7962d285108edd675",
                 "shasum": ""
             },
             "require": {
@@ -2860,7 +2859,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.13-dev"
+                    "dev-master": "1.14-dev"
                 }
             },
             "autoload": {
@@ -2896,20 +2895,20 @@
                 "portable",
                 "shim"
             ],
-            "time": "2019-11-27T16:25:15+00:00"
+            "time": "2020-01-13T11:15:53+00:00"
         },
         {
             "name": "symfony/process",
-            "version": "v5.0.2",
+            "version": "v5.0.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/process.git",
-                "reference": "ea2dc31b59d63abd9bc2356ac72eb7b3f3469f0e"
+                "reference": "f9ffd870f5ac01abec7b2b5e15f904ca9400ecd1"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/process/zipball/ea2dc31b59d63abd9bc2356ac72eb7b3f3469f0e",
-                "reference": "ea2dc31b59d63abd9bc2356ac72eb7b3f3469f0e",
+                "url": "https://api.github.com/repos/symfony/process/zipball/f9ffd870f5ac01abec7b2b5e15f904ca9400ecd1",
+                "reference": "f9ffd870f5ac01abec7b2b5e15f904ca9400ecd1",
                 "shasum": ""
             },
             "require": {
@@ -2945,7 +2944,7 @@
             ],
             "description": "Symfony Process Component",
             "homepage": "https://symfony.com",
-            "time": "2019-12-10T11:06:55+00:00"
+            "time": "2020-01-09T09:53:06+00:00"
         },
         {
             "name": "symfony/service-contracts",
@@ -3007,16 +3006,16 @@
         },
         {
             "name": "symfony/stopwatch",
-            "version": "v5.0.2",
+            "version": "v5.0.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/stopwatch.git",
-                "reference": "d410282956706e0b08681a5527447a8e6b6f421e"
+                "reference": "5d9add8034135b9a5f7b101d1e42c797e7f053e4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/stopwatch/zipball/d410282956706e0b08681a5527447a8e6b6f421e",
-                "reference": "d410282956706e0b08681a5527447a8e6b6f421e",
+                "url": "https://api.github.com/repos/symfony/stopwatch/zipball/5d9add8034135b9a5f7b101d1e42c797e7f053e4",
+                "reference": "5d9add8034135b9a5f7b101d1e42c797e7f053e4",
                 "shasum": ""
             },
             "require": {
@@ -3053,20 +3052,20 @@
             ],
             "description": "Symfony Stopwatch Component",
             "homepage": "https://symfony.com",
-            "time": "2019-11-18T17:27:11+00:00"
+            "time": "2020-01-04T14:08:26+00:00"
         },
         {
             "name": "symfony/var-dumper",
-            "version": "v5.0.2",
+            "version": "v5.0.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/var-dumper.git",
-                "reference": "d7bc61d5d335fa9b1b91e14bb16861e8ca50f53a"
+                "reference": "923591cfb78a935f0c98968fedfad05bfda9d01f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/var-dumper/zipball/d7bc61d5d335fa9b1b91e14bb16861e8ca50f53a",
-                "reference": "d7bc61d5d335fa9b1b91e14bb16861e8ca50f53a",
+                "url": "https://api.github.com/repos/symfony/var-dumper/zipball/923591cfb78a935f0c98968fedfad05bfda9d01f",
+                "reference": "923591cfb78a935f0c98968fedfad05bfda9d01f",
                 "shasum": ""
             },
             "require": {
@@ -3128,20 +3127,20 @@
                 "debug",
                 "dump"
             ],
-            "time": "2019-12-18T13:50:31+00:00"
+            "time": "2020-01-25T15:56:29+00:00"
         },
         {
             "name": "symfony/yaml",
-            "version": "v4.4.2",
+            "version": "v4.4.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "a08832b974dd5fafe3085a66d41fe4c84bb2628c"
+                "reference": "cd014e425b3668220adb865f53bff64b3ad21767"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/a08832b974dd5fafe3085a66d41fe4c84bb2628c",
-                "reference": "a08832b974dd5fafe3085a66d41fe4c84bb2628c",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/cd014e425b3668220adb865f53bff64b3ad21767",
+                "reference": "cd014e425b3668220adb865f53bff64b3ad21767",
                 "shasum": ""
             },
             "require": {
@@ -3187,7 +3186,7 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2019-12-10T10:33:21+00:00"
+            "time": "2020-01-21T11:12:16+00:00"
         },
         {
             "name": "twig/extensions",
@@ -3246,16 +3245,16 @@
         },
         {
             "name": "twig/twig",
-            "version": "v2.12.3",
+            "version": "v2.12.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/twigphp/Twig.git",
-                "reference": "97b6311585cae66a26833b14b33785f5797f7d39"
+                "reference": "18772e0190734944277ee97a02a9a6c6555fcd94"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/twigphp/Twig/zipball/97b6311585cae66a26833b14b33785f5797f7d39",
-                "reference": "97b6311585cae66a26833b14b33785f5797f7d39",
+                "url": "https://api.github.com/repos/twigphp/Twig/zipball/18772e0190734944277ee97a02a9a6c6555fcd94",
+                "reference": "18772e0190734944277ee97a02a9a6c6555fcd94",
                 "shasum": ""
             },
             "require": {
@@ -3307,7 +3306,7 @@
             "keywords": [
                 "templating"
             ],
-            "time": "2019-12-28T07:12:03+00:00"
+            "time": "2020-02-11T15:31:23+00:00"
         },
         {
             "name": "webignition/disallowed-character-terminated-string",
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 37364b7..d954f19 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,6 +1,4 @@
-ARG PHP_BASE_IMAGE
-
-FROM ${PHP_BASE_IMAGE}
+FROM php:7.3-cli
 
 RUN apt-get update && apt-get install -y \
     libtidy-dev \
@@ -22,11 +20,11 @@ RUN apt-get update \
     && rm -rf /var/lib/apt/lists/*
 
 # get composer and required tools
-RUN curl -sLO https://getcomposer.org/download/1.9.0/composer.phar \
+RUN curl -sLO https://getcomposer.org/download/1.9.3/composer.phar \
     && mv composer.phar /usr/local/bin/composer \
     && chmod +x /usr/local/bin/composer
 
 # Deployer
-RUN curl -sLO https://deployer.org/releases/v6.4.6/deployer.phar \
+RUN curl -sLO https://deployer.org/releases/v6.7.3/deployer.phar \
     && mv deployer.phar /usr/local/bin/dep \
     && chmod +x /usr/local/bin/dep
diff --git a/tools/build-docker b/tools/build-docker
index 664c34f..2f323b0 100755
--- a/tools/build-docker
+++ b/tools/build-docker
@@ -2,11 +2,7 @@
 
 source .env
 
-docker pull "${PHP_BASE_IMAGE}"
-docker pull "${NODE_IMAGE}"
-
 docker build \
     --file docker/Dockerfile \
-    --build-arg "PHP_BASE_IMAGE=${PHP_BASE_IMAGE}" \
     --tag "${PHP_IMAGE}" \
     "$PWD"