diff --git a/embed/example.html b/embed/example.html
index 4d74b4d21..e990b176a 100644
--- a/embed/example.html
+++ b/embed/example.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!doctype html>
 <html>
   <head>
     <style>
diff --git a/package.json b/package.json
index 3adb1bda5..9fbb45df8 100644
--- a/package.json
+++ b/package.json
@@ -64,7 +64,7 @@
     "karma-coverage-istanbul-reporter": "~3.0.3",
     "karma-jasmine": "~4.0.1",
     "karma-jasmine-html-reporter": "^1.5.4",
-    "prettier": "^2.2.1",
+    "prettier": "^3.0.0",
     "pretty-quick": "^3.1.0",
     "protractor": "~7.0.0",
     "stream": "^0.0.2",
diff --git a/src/index.html b/src/index.html
index 6fa6a0d0e..f0f4a4ed7 100755
--- a/src/index.html
+++ b/src/index.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!doctype html>
 <html lang="en">
   <head>
     <!-- Google Tag Manager -->
diff --git a/yarn.lock b/yarn.lock
index 562ad7505..e64d61110 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7148,10 +7148,10 @@ prettier-linter-helpers@^1.0.0:
   dependencies:
     fast-diff "^1.1.2"
 
-prettier@^2.2.1:
-  version "2.8.8"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.8.8.tgz#e8c5d7e98a4305ffe3de2e1fc4aca1a71c28b1da"
-  integrity sha512-tdN8qQGvNjw4CHbY+XXk0JgCXn9QiF21a55rBe5LJAU+kDyC4WQn4+awm2Xfk2lQMk5fKup9XgzTZtGkjBdP9Q==
+prettier@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.0.0.tgz#e7b19f691245a21d618c68bc54dc06122f6105ae"
+  integrity sha512-zBf5eHpwHOGPC47h0zrPyNn+eAEIdEzfywMoYn2XPi0P44Zp0tSq64rq0xAREh4auw2cJZHo9QUob+NqCQky4g==
 
 pretty-bytes@^5.3.0:
   version "5.6.0"
