diff --git a/README.md b/README.md
index 25aacab..335de4b 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 [![npm (scoped)](https://img.shields.io/npm/v/@jakejarvis/dark-mode)](https://www.npmjs.com/package/@jakejarvis/dark-mode)
 [![MIT License](https://img.shields.io/github/license/jakejarvis/dark-mode?color=violet)](LICENSE)
 
-Very simple CSS dark/light mode toggler with saved preference via local storage & dynamic OS setting detection. Zero dependencies and only ~600 bytes gzipped!
+Very simple CSS dark/light mode toggler with saved preference via local storage & dynamic OS setting detection. Zero dependencies and [only ~600 bytes gzipped!](https://bundlephobia.com/package/@jakejarvis/dark-mode)
 
 - [View the example.](https://jakejarvis.github.io/dark-mode/)
 - [Read the blog post.](https://jarv.is/notes/dark-mode/)
diff --git a/package.json b/package.json
index 1d84b5e..0143bd6 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,7 @@
     "url": "https://github.com/jakejarvis/dark-mode.git"
   },
   "type": "module",
+  "sideEffects": false,
   "files": [
     "dist"
   ],
diff --git a/yarn.lock b/yarn.lock
index 8575d6c..7970663 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -973,13 +973,12 @@
     infer-owner "^1.0.4"
 
 "@npmcli/run-script@^1.8.2":
-  version "1.8.5"
-  resolved "https://registry.yarnpkg.com/@npmcli/run-script/-/run-script-1.8.5.tgz#f250a0c5e1a08a792d775a315d0ff42fc3a51e1d"
-  integrity sha512-NQspusBCpTjNwNRFMtz2C5MxoxyzlbuJ4YEhxAKrIonTiirKDtatsZictx9RgamQIx6+QuHMNmPl0wQdoESs9A==
+  version "1.8.6"
+  resolved "https://registry.yarnpkg.com/@npmcli/run-script/-/run-script-1.8.6.tgz#18314802a6660b0d4baa4c3afe7f1ad39d8c28b7"
+  integrity sha512-e42bVZnC6VluBZBAFEr3YrdqSspG3bgilyg4nSLBJ7TRGNCzxHa92XAHxQBLYg0BmgwO4b2mf3h/l5EkEWRn3g==
   dependencies:
     "@npmcli/node-gyp" "^1.0.2"
     "@npmcli/promise-spawn" "^1.3.2"
-    infer-owner "^1.0.4"
     node-gyp "^7.1.0"
     read-package-json-fast "^2.0.1"
 
@@ -1059,9 +1058,9 @@
   integrity sha512-Klz949h02Gz2uZCMGwDUSDS1YBlTdDDgbWHi+81l29tQALUtvz4rAYi5uoVhE5Lagoq6DeqAUlbrHvW/mXDgdQ==
 
 "@types/node@*":
-  version "16.4.13"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-16.4.13.tgz#7dfd9c14661edc65cccd43a29eb454174642370d"
-  integrity sha512-bLL69sKtd25w7p1nvg9pigE4gtKVpGTPojBFLMkGHXuUgap2sLqQt2qUnqmVCDfzGUL0DRNZP+1prIZJbMeAXg==
+  version "16.6.1"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-16.6.1.tgz#aee62c7b966f55fc66c7b6dfa1d58db2a616da61"
+  integrity sha512-Sr7BhXEAer9xyGuCN3Ek9eg9xPviCF2gfu9kTfuU2HkTVAMYSDeX40fvpmo72n5nansg3nsBjuQBrsS28r+NUw==
 
 "@types/resolve@1.17.1":
   version "1.17.1"
@@ -1386,9 +1385,9 @@ camelcase@^6.2.0:
   integrity sha512-c7wVvbw3f37nuobQNtgsgG9POC9qMbNuMQmTCqZv23b6MIz0fcYpBiOlv9gEN/hdLdnZTDQhg6e9Dq5M1vKvfg==
 
 caniuse-lite@^1.0.30001248, caniuse-lite@^1.0.30001249:
-  version "1.0.30001249"
-  resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30001249.tgz#90a330057f8ff75bfe97a94d047d5e14fabb2ee8"
-  integrity sha512-vcX4U8lwVXPdqzPWi6cAJ3FnQaqXbBqy/GZseKNQzRj37J7qZdGcBtxq/QLFNLLlfsoXLUdHw8Iwenri86Tagw==
+  version "1.0.30001251"
+  resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30001251.tgz#6853a606ec50893115db660f82c094d18f096d85"
+  integrity sha512-HOe1r+9VkU4TFmnU70z+r7OLmtR+/chB1rdcJUeQlAinjEeb0cKL20tlAtOagNZhbrtLnCvV19B4FmF1rgzl6A==
 
 caseless@~0.12.0:
   version "0.12.0"
@@ -1601,9 +1600,9 @@ ecc-jsbn@~0.1.1:
     safer-buffer "^2.1.0"
 
 electron-to-chromium@^1.3.793:
-  version "1.3.802"
-  resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.802.tgz#0afa989321de3e904ac653ee79e0d642883731a1"
-  integrity sha512-dXB0SGSypfm3iEDxrb5n/IVKeX4uuTnFHdve7v+yKJqNpEP0D4mjFJ8e1znmSR+OOVlVC+kDO6f2kAkTFXvJBg==
+  version "1.3.807"
+  resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.807.tgz#c2eb803f4f094869b1a24151184ffbbdbf688b1f"
+  integrity sha512-p8uxxg2a23zRsvQ2uwA/OOI+O4BQxzaR7YKMIGGGQCpYmkFX2CVF5f0/hxLMV7yCr7nnJViCwHLhPfs52rIYCA==
 
 emoji-regex@^7.0.1:
   version "7.0.3"
@@ -1990,9 +1989,9 @@ globals@^11.1.0:
   integrity sha512-WOBp/EEGUiIsJSp7wcv/y6MO+lV9UoncWqxuFfm8eBwzWNgyfBd6Gz+IeKQ9jCmyhoH99g15M3T+QaVHFjizVA==
 
 globals@^13.6.0, globals@^13.9.0:
-  version "13.10.0"
-  resolved "https://registry.yarnpkg.com/globals/-/globals-13.10.0.tgz#60ba56c3ac2ca845cfbf4faeca727ad9dd204676"
-  integrity sha512-piHC3blgLGFjvOuMmWZX60f+na1lXFDhQXBf1UYp2fXPXqvEUbOhNwi6BsQ0bQishwedgnjkwv1d9zKf+MWw3g==
+  version "13.11.0"
+  resolved "https://registry.yarnpkg.com/globals/-/globals-13.11.0.tgz#40ef678da117fe7bd2e28f1fab24951bd0255be7"
+  integrity sha512-08/xrJ7wQjK9kkkRoI3OFUBbLx4f+6x3SGwcPvQ0QH6goFDrOU2oyAWrmh3dJezu65buo+HBMzAMQy6rovVC3g==
   dependencies:
     type-fest "^0.20.2"
 
@@ -3265,9 +3264,9 @@ table@^6.0.9:
     strip-ansi "^6.0.0"
 
 tar@^6.0.2, tar@^6.1.0:
-  version "6.1.7"
-  resolved "https://registry.yarnpkg.com/tar/-/tar-6.1.7.tgz#c566d1107d38b09e92983a68db5534fc7f6cab42"
-  integrity sha512-PBoRkOJU0X3lejJ8GaRCsobjXTgFofRDSPdSUhRSdlwJfifRlQBwGXitDItdGFu0/h0XDMCkig0RN1iT7DBxhA==
+  version "6.1.8"
+  resolved "https://registry.yarnpkg.com/tar/-/tar-6.1.8.tgz#4fc50cfe56511c538ce15b71e05eebe66530cbd4"
+  integrity sha512-sb9b0cp855NbkMJcskdSYA7b11Q8JsX4qe4pyUAfHp+Y6jBjJeek2ZVlwEfWayshEIwlIzXx0Fain3QG9JPm2A==
   dependencies:
     chownr "^2.0.0"
     fs-minipass "^2.0.0"