diff --git a/.changeset/grumpy-ears-chew.md b/.changeset/grumpy-ears-chew.md
new file mode 100644
index 0000000..1d7f201
--- /dev/null
+++ b/.changeset/grumpy-ears-chew.md
@@ -0,0 +1,5 @@
+---
+"prettier-plugin-astro": patch
+---
+
+Format doctype as lowercase to match Prettier 3.0
diff --git a/src/printer/index.ts b/src/printer/index.ts
index 74538ba..0935c78 100644
--- a/src/printer/index.ts
+++ b/src/printer/index.ts
@@ -319,7 +319,7 @@ export function print(path: AstPath, opts: ParserOptions, print: printFn): Doc {
case 'doctype': {
// https://www.w3.org/wiki/Doctypes_and_markup_styles
- return ['', hardline];
+ return ['', hardline];
}
case 'comment':
diff --git a/test/fixtures/basic/basic-html/output.astro b/test/fixtures/basic/basic-html/output.astro
index c77d273..3cfe94a 100644
--- a/test/fixtures/basic/basic-html/output.astro
+++ b/test/fixtures/basic/basic-html/output.astro
@@ -1,4 +1,4 @@
-
+
diff --git a/test/fixtures/other/doctype-with-embedded-expr/output.astro b/test/fixtures/other/doctype-with-embedded-expr/output.astro
index 0d47aa2..6208244 100644
--- a/test/fixtures/other/doctype-with-embedded-expr/output.astro
+++ b/test/fixtures/other/doctype-with-embedded-expr/output.astro
@@ -6,7 +6,7 @@ let title = "My Site";
const colors = ["red", "yellow", "blue"];
---
-
+
My site
diff --git a/test/fixtures/other/doctype-with-extra-attributes/output.astro b/test/fixtures/other/doctype-with-extra-attributes/output.astro
index 76e9d89..4c5fd5d 100644
--- a/test/fixtures/other/doctype-with-extra-attributes/output.astro
+++ b/test/fixtures/other/doctype-with-extra-attributes/output.astro
@@ -6,7 +6,7 @@ let title = "My Site";
const colors = ["red", "yellow", "blue"];
---
-
+
My site
diff --git a/test/fixtures/other/fragment/output.astro b/test/fixtures/other/fragment/output.astro
index 604781e..eaa859a 100644
--- a/test/fixtures/other/fragment/output.astro
+++ b/test/fixtures/other/fragment/output.astro
@@ -1,4 +1,4 @@
-
+