diff --git a/theme/package.json b/theme/package.json
index 4ee64f8b4..c85a5e079 100644
--- a/theme/package.json
+++ b/theme/package.json
@@ -36,7 +36,7 @@
     "gatsby-transformer-json": "^2.4.14",
     "gatsby-transformer-sharp": "^2.5.17",
     "react-helmet": "^5.2.1",
-    "theme-ui": "^0.2.52",
+    "theme-ui": "^0.15.4",
     "typeface-open-sans": "^1.1.13",
     "typeface-pacifico": "^1.1.13"
   },
diff --git a/yarn.lock b/yarn.lock
index 3190cefe3..abeef80a3 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1055,6 +1055,11 @@
   resolved "https://registry.yarnpkg.com/@emotion/memoize/-/memoize-0.7.4.tgz#19bf0f5af19149111c40d98bb0cf82119f5d9eeb"
   integrity sha512-Ja/Vfqe3HpuzRsG1oBtWTHk2PGZ7GR+2Vz5iYGelAw8dx32K0y7PjVuxK6z1nMpZOqAFsRUPCkK1YjJ56qJlgw==
 
+"@emotion/memoize@^0.7.1":
+  version "0.7.5"
+  resolved "https://registry.yarnpkg.com/@emotion/memoize/-/memoize-0.7.5.tgz#2c40f81449a4e554e9fc6396910ed4843ec2be50"
+  integrity sha512-igX9a37DR2ZPGYtV6suZ6whr8pTFtyHL3K/oLUotxpSVO2ASaprmAe2Dkq7tBo7CRY7MMDrAa9nuQP9/YG8FxQ==
+
 "@emotion/serialize@^0.11.15", "@emotion/serialize@^0.11.16":
   version "0.11.16"
   resolved "https://registry.yarnpkg.com/@emotion/serialize/-/serialize-0.11.16.tgz#dee05f9e96ad2fb25a5206b6d759b2d1ed3379ad"
@@ -1775,11 +1780,105 @@
     escape-string-regexp "^2.0.0"
     lodash.deburr "^4.1.0"
 
-"@styled-system/css@^5.0.16":
+"@styled-system/background@^5.1.2":
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/@styled-system/background/-/background-5.1.2.tgz#75c63d06b497ab372b70186c0bf608d62847a2ba"
+  integrity sha512-jtwH2C/U6ssuGSvwTN3ri/IyjdHb8W9X/g8Y0JLcrH02G+BW3OS8kZdHphF1/YyRklnrKrBT2ngwGUK6aqqV3A==
+  dependencies:
+    "@styled-system/core" "^5.1.2"
+
+"@styled-system/border@^5.1.5":
+  version "5.1.5"
+  resolved "https://registry.yarnpkg.com/@styled-system/border/-/border-5.1.5.tgz#0493d4332d2b59b74bb0d57d08c73eb555761ba6"
+  integrity sha512-JvddhNrnhGigtzWRCVuAHepniyVi6hBlimxWDVAdcTuk7aRn9BYJUwfHslURtwYFsF5FoEs8Zmr1oZq2M1AP0A==
+  dependencies:
+    "@styled-system/core" "^5.1.2"
+
+"@styled-system/color@^5.1.2":
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/@styled-system/color/-/color-5.1.2.tgz#b8d6b4af481faabe4abca1a60f8daa4ccc2d9f43"
+  integrity sha512-1kCkeKDZkt4GYkuFNKc7vJQMcOmTl3bJY3YBUs7fCNM6mMYJeT1pViQ2LwBSBJytj3AB0o4IdLBoepgSgGl5MA==
+  dependencies:
+    "@styled-system/core" "^5.1.2"
+
+"@styled-system/core@^5.1.2":
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/@styled-system/core/-/core-5.1.2.tgz#b8b7b86455d5a0514f071c4fa8e434b987f6a772"
+  integrity sha512-XclBDdNIy7OPOsN4HBsawG2eiWfCcuFt6gxKn1x4QfMIgeO6TOlA2pZZ5GWZtIhCUqEPTgIBta6JXsGyCkLBYw==
+  dependencies:
+    object-assign "^4.1.1"
+
+"@styled-system/css@^5.0.16", "@styled-system/css@^5.1.5":
   version "5.1.5"
   resolved "https://registry.yarnpkg.com/@styled-system/css/-/css-5.1.5.tgz#0460d5f3ff962fa649ea128ef58d9584f403bbbc"
   integrity sha512-XkORZdS5kypzcBotAMPBoeckDs9aSZVkvrAlq5K3xP8IMAUek+x2O4NtwoSgkYkWWzVBu6DGdFZLR790QWGG+A==
 
+"@styled-system/flexbox@^5.1.2":
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/@styled-system/flexbox/-/flexbox-5.1.2.tgz#077090f43f61c3852df63da24e4108087a8beecf"
+  integrity sha512-6hHV52+eUk654Y1J2v77B8iLeBNtc+SA3R4necsu2VVinSD7+XY5PCCEzBFaWs42dtOEDIa2lMrgL0YBC01mDQ==
+  dependencies:
+    "@styled-system/core" "^5.1.2"
+
+"@styled-system/grid@^5.1.2":
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/@styled-system/grid/-/grid-5.1.2.tgz#7165049877732900b99cd00759679fbe45c6c573"
+  integrity sha512-K3YiV1KyHHzgdNuNlaw8oW2ktMuGga99o1e/NAfTEi5Zsa7JXxzwEnVSDSBdJC+z6R8WYTCYRQC6bkVFcvdTeg==
+  dependencies:
+    "@styled-system/core" "^5.1.2"
+
+"@styled-system/layout@^5.1.2":
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/@styled-system/layout/-/layout-5.1.2.tgz#12d73e79887e10062f4dbbbc2067462eace42339"
+  integrity sha512-wUhkMBqSeacPFhoE9S6UF3fsMEKFv91gF4AdDWp0Aym1yeMPpqz9l9qS/6vjSsDPF7zOb5cOKC3tcKKOMuDCPw==
+  dependencies:
+    "@styled-system/core" "^5.1.2"
+
+"@styled-system/position@^5.1.2":
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/@styled-system/position/-/position-5.1.2.tgz#56961266566836f57a24d8e8e33ce0c1adb59dd3"
+  integrity sha512-60IZfMXEOOZe3l1mCu6sj/2NAyUmES2kR9Kzp7s2D3P4qKsZWxD1Se1+wJvevb+1TP+ZMkGPEYYXRyU8M1aF5A==
+  dependencies:
+    "@styled-system/core" "^5.1.2"
+
+"@styled-system/shadow@^5.1.2":
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/@styled-system/shadow/-/shadow-5.1.2.tgz#beddab28d7de03cd0177a87ac4ed3b3b6d9831fd"
+  integrity sha512-wqniqYb7XuZM7K7C0d1Euxc4eGtqEe/lvM0WjuAFsQVImiq6KGT7s7is+0bNI8O4Dwg27jyu4Lfqo/oIQXNzAg==
+  dependencies:
+    "@styled-system/core" "^5.1.2"
+
+"@styled-system/should-forward-prop@^5.1.2":
+  version "5.1.5"
+  resolved "https://registry.yarnpkg.com/@styled-system/should-forward-prop/-/should-forward-prop-5.1.5.tgz#c392008c6ae14a6eb78bf1932733594f7f7e5c76"
+  integrity sha512-+rPRomgCGYnUIaFabDoOgpSDc4UUJ1KsmlnzcEp0tu5lFrBQKgZclSo18Z1URhaZm7a6agGtS5Xif7tuC2s52Q==
+  dependencies:
+    "@emotion/is-prop-valid" "^0.8.1"
+    "@emotion/memoize" "^0.7.1"
+    styled-system "^5.1.5"
+
+"@styled-system/space@^5.1.2":
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/@styled-system/space/-/space-5.1.2.tgz#38925d2fa29a41c0eb20e65b7c3efb6e8efce953"
+  integrity sha512-+zzYpR8uvfhcAbaPXhH8QgDAV//flxqxSjHiS9cDFQQUSznXMQmxJegbhcdEF7/eNnJgHeIXv1jmny78kipgBA==
+  dependencies:
+    "@styled-system/core" "^5.1.2"
+
+"@styled-system/typography@^5.1.2":
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/@styled-system/typography/-/typography-5.1.2.tgz#65fb791c67d50cd2900d234583eaacdca8c134f7"
+  integrity sha512-BxbVUnN8N7hJ4aaPOd7wEsudeT7CxarR+2hns8XCX1zp0DFfbWw4xYa/olA0oQaqx7F1hzDg+eRaGzAJbF+jOg==
+  dependencies:
+    "@styled-system/core" "^5.1.2"
+
+"@styled-system/variant@^5.1.5":
+  version "5.1.5"
+  resolved "https://registry.yarnpkg.com/@styled-system/variant/-/variant-5.1.5.tgz#8446d8aad06af3a4c723d717841df2dbe4ddeafd"
+  integrity sha512-Yn8hXAFoWIro8+Q5J8YJd/mP85Teiut3fsGVR9CAxwgNfIAiqlYxsk5iHU7VHJks/0KjL4ATSjmbtCDC/4l1qw==
+  dependencies:
+    "@styled-system/core" "^5.1.2"
+    "@styled-system/css" "^5.1.5"
+
 "@szmarczak/http-timer@^1.1.2":
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/@szmarczak/http-timer/-/http-timer-1.1.2.tgz#b1665e2c461a2cd92f4c1bbf50d5454de0d4b421"
@@ -1794,6 +1893,50 @@
   dependencies:
     defer-to-connect "^2.0.0"
 
+"@theme-ui/color-modes@^0.15.4":
+  version "0.15.4"
+  resolved "https://registry.yarnpkg.com/@theme-ui/color-modes/-/color-modes-0.15.4.tgz#09b1db60d7ae0a4ae37afb92f6b29fcd19eeef12"
+  integrity sha512-aM3I81GoMjLp5K2T7oI75GkOrtZHOOC41uIqcDwkQiBT63uZWn5ndTcdmS2lSVAd5R6V1T/QN+19CKKpn2Xbrw==
+  dependencies:
+    "@theme-ui/core" "^0.15.4"
+    "@theme-ui/css" "^0.15.4"
+    deepmerge "^4.2.2"
+
+"@theme-ui/components@^0.15.4":
+  version "0.15.4"
+  resolved "https://registry.yarnpkg.com/@theme-ui/components/-/components-0.15.4.tgz#e7f0a378db79f5ad5d814353761ad70895109cb2"
+  integrity sha512-ubMIx01N/cWt6mSOm92zppOE+k2u7oFQisLcKBk6bN/nekDQ9T220xtaZDRr7IiylxrQ6GOgdMQaYIOFdPVT5w==
+  dependencies:
+    "@styled-system/color" "^5.1.2"
+    "@styled-system/should-forward-prop" "^5.1.2"
+    "@styled-system/space" "^5.1.2"
+    "@theme-ui/css" "^0.15.4"
+    "@types/styled-system" "^5.1.13"
+
+"@theme-ui/core@^0.15.4":
+  version "0.15.4"
+  resolved "https://registry.yarnpkg.com/@theme-ui/core/-/core-0.15.4.tgz#cb959a6f31515f8fb3a3d583c44089ec18cbe2e5"
+  integrity sha512-QlbRrY7TV19LEMERA+vUANnte6VUPHoFfoU76lZ2aUys9w+Rr0IZGmzUxXSOg/172v9cxsvbVG0Uleny6B6Q8A==
+  dependencies:
+    "@theme-ui/css" "^0.15.4"
+    deepmerge "^4.2.2"
+
+"@theme-ui/css@^0.15.4":
+  version "0.15.4"
+  resolved "https://registry.yarnpkg.com/@theme-ui/css/-/css-0.15.4.tgz#c8d6709867c011520c30c23f06486f9e44af496c"
+  integrity sha512-6BBC2QAlS4vCSWqJc4KD4ORD2wJ6NS1aOxbI85Z+3nKzEsYaT/ihDtIvlXzPwHTd4tFTmeJqeoBVNLZrJ8L8CA==
+  dependencies:
+    csstype "^3.0.10"
+
+"@theme-ui/theme-provider@^0.15.4":
+  version "0.15.4"
+  resolved "https://registry.yarnpkg.com/@theme-ui/theme-provider/-/theme-provider-0.15.4.tgz#5ef3f2d4f8533e77f285385a34911c5435183753"
+  integrity sha512-U4WsTwxTQIBZsVAafkM8PgHgJ0DpZxu+U4cdgRT7luoF8wbgK3jAzvds9gQ8g9nZf+C4D0/xhK6+Ef9CdZm7rg==
+  dependencies:
+    "@theme-ui/color-modes" "^0.15.4"
+    "@theme-ui/core" "^0.15.4"
+    "@theme-ui/css" "^0.15.4"
+
 "@turist/fetch@^7.1.7":
   version "7.1.7"
   resolved "https://registry.yarnpkg.com/@turist/fetch/-/fetch-7.1.7.tgz#a2b1f7ec0265e6fe0946c51eef34bad9b9efc865"
@@ -2029,6 +2172,13 @@
     "@types/glob" "*"
     "@types/node" "*"
 
+"@types/styled-system@^5.1.13":
+  version "5.1.15"
+  resolved "https://registry.yarnpkg.com/@types/styled-system/-/styled-system-5.1.15.tgz#075f969cc028a895dba916c07708e2fe828d7077"
+  integrity sha512-1uls4wipZn8FtYFZ7upRVFDoEeOXTQTs2zuyOZPn02T6rjIxtvj2P2lG5qsxXHhKuKsu3thveCZrtaeLE/ibLg==
+  dependencies:
+    csstype "^3.0.2"
+
 "@types/tmp@^0.0.33":
   version "0.0.33"
   resolved "https://registry.yarnpkg.com/@types/tmp/-/tmp-0.0.33.tgz#1073c4bc824754ae3d10cfab88ab0237ba964e4d"
@@ -4465,6 +4615,11 @@ csstype@^2.5.7:
   resolved "https://registry.yarnpkg.com/csstype/-/csstype-2.6.13.tgz#a6893015b90e84dd6e85d0e3b442a1e84f2dbe0f"
   integrity sha512-ul26pfSQTZW8dcOnD2iiJssfXw0gdNVX9IJDH/X3K5DGPfj+fUYe3kB+swUY6BF3oZDxaID3AJt+9/ojSAE05A==
 
+csstype@^3.0.10:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/csstype/-/csstype-3.1.1.tgz#841b532c45c758ee546a11d5bd7b7b473c8c30b9"
+  integrity sha512-DJR/VvkAvSZW9bTouZue2sSxDwdTN92uHjqeKVm+0dAqdfNykRzQ95tay8aXMBAAPpUiq4Qcug2L7neoRh2Egw==
+
 csstype@^3.0.2:
   version "3.0.3"
   resolved "https://registry.yarnpkg.com/csstype/-/csstype-3.0.3.tgz#2b410bbeba38ba9633353aff34b05d9755d065f8"
@@ -4645,7 +4800,7 @@ deepmerge@^2.1.1:
   resolved "https://registry.yarnpkg.com/deepmerge/-/deepmerge-2.2.1.tgz#5d3ff22a01c00f645405a2fbc17d0778a1801170"
   integrity sha512-R9hc1Xa/NOBi9WRVUWg19rl1UB7Tt4kuPd+thNJgFZoxXsTz7ncaPaeIm+40oSGuP33DfMb4sZt1QIGiJzC4EA==
 
-deepmerge@^4.0.0:
+deepmerge@^4.0.0, deepmerge@^4.2.2:
   version "4.2.2"
   resolved "https://registry.yarnpkg.com/deepmerge/-/deepmerge-4.2.2.tgz#44d2ea3679b8f4d4ffba33f03d865fc1e7bf4955"
   integrity sha512-FJ3UgI4gIl+PHZm53knsuSFpE+nESMr7M4v9QcgB7S63Kj/6WqMiFQJpBBYz1Pt+66bZpP3Q7Lye0Oo9MPKEdg==
@@ -13015,6 +13170,25 @@ style-to-object@^0.3.0:
   dependencies:
     inline-style-parser "0.1.1"
 
+styled-system@^5.1.5:
+  version "5.1.5"
+  resolved "https://registry.yarnpkg.com/styled-system/-/styled-system-5.1.5.tgz#e362d73e1dbb5641a2fd749a6eba1263dc85075e"
+  integrity sha512-7VoD0o2R3RKzOzPK0jYrVnS8iJdfkKsQJNiLRDjikOpQVqQHns/DXWaPZOH4tIKkhAT7I6wIsy9FWTWh2X3q+A==
+  dependencies:
+    "@styled-system/background" "^5.1.2"
+    "@styled-system/border" "^5.1.5"
+    "@styled-system/color" "^5.1.2"
+    "@styled-system/core" "^5.1.2"
+    "@styled-system/flexbox" "^5.1.2"
+    "@styled-system/grid" "^5.1.2"
+    "@styled-system/layout" "^5.1.2"
+    "@styled-system/position" "^5.1.2"
+    "@styled-system/shadow" "^5.1.2"
+    "@styled-system/space" "^5.1.2"
+    "@styled-system/typography" "^5.1.2"
+    "@styled-system/variant" "^5.1.5"
+    object-assign "^4.1.1"
+
 stylehacks@^4.0.0:
   version "4.0.3"
   resolved "https://registry.yarnpkg.com/stylehacks/-/stylehacks-4.0.3.tgz#6718fcaf4d1e07d8a1318690881e8d96726a71d5"
@@ -13235,7 +13409,18 @@ text-table@0.2.0, text-table@^0.2.0:
   resolved "https://registry.yarnpkg.com/text-table/-/text-table-0.2.0.tgz#7f5ee823ae805207c00af2df4a84ec3fcfa570b4"
   integrity sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=
 
-theme-ui@^0.2.49, theme-ui@^0.2.52:
+theme-ui@^0.15.4:
+  version "0.15.4"
+  resolved "https://registry.yarnpkg.com/theme-ui/-/theme-ui-0.15.4.tgz#9614833c0ea046d3fe0d5a8c5dc8dfe108a30f32"
+  integrity sha512-IBaylKghKgP80bAeZVl79KfC3IAuQcfvXr/hJxF6qOOLlyyHkI5PRTrb58rN6cqxE10lYORHZbR9lKLuGILWJw==
+  dependencies:
+    "@theme-ui/color-modes" "^0.15.4"
+    "@theme-ui/components" "^0.15.4"
+    "@theme-ui/core" "^0.15.4"
+    "@theme-ui/css" "^0.15.4"
+    "@theme-ui/theme-provider" "^0.15.4"
+
+theme-ui@^0.2.49:
   version "0.2.52"
   resolved "https://registry.yarnpkg.com/theme-ui/-/theme-ui-0.2.52.tgz#c041a32b0b257fc8ecbae273e14e92abd48c0f2d"
   integrity sha512-JFujorP5aFxIm1UyVCtefN5baXjwh5TXHKFYNWgAP+3rqVvggIr46uSMrRNvDjyhFOQiMK8YI8ctPQrrhcETpw==