diff --git a/.changeset/serious-waves-fry.md b/.changeset/serious-waves-fry.md
new file mode 100644
index 000000000000..a8b8d77c157c
--- /dev/null
+++ b/.changeset/serious-waves-fry.md
@@ -0,0 +1,5 @@
+---
+'astro': major
+---
+
+The scoped hash created by the Astro compiler is now **lowercase**.
diff --git a/packages/astro/package.json b/packages/astro/package.json
index 770c8b9bdfcc..462a10307170 100644
--- a/packages/astro/package.json
+++ b/packages/astro/package.json
@@ -119,7 +119,7 @@
     "test:e2e:match": "playwright test -g"
   },
   "dependencies": {
-    "@astrojs/compiler": "^1.8.1",
+    "@astrojs/compiler": "^2.0.0",
     "@astrojs/internal-helpers": "workspace:*",
     "@astrojs/markdown-remark": "workspace:*",
     "@astrojs/telemetry": "workspace:*",
diff --git a/packages/astro/test/0-css.test.js b/packages/astro/test/0-css.test.js
index 9a05074fb906..9371673d4942 100644
--- a/packages/astro/test/0-css.test.js
+++ b/packages/astro/test/0-css.test.js
@@ -45,9 +45,7 @@ describe('CSS', function () {
 					if (/^data-astro-cid-[A-Za-z0-9-]+/.test(key)) {
 						// Ema: this is ugly, but for reasons that I don't want to explore, cheerio
 						// lower case the hash of the attribute
-						scopedAttribute = key
-							.toUpperCase()
-							.replace('data-astro-cid-'.toUpperCase(), 'data-astro-cid-');
+						scopedAttribute = key;
 					}
 				}
 				if (!scopedAttribute) {
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 7a4d64d2714e..37e1db857338 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -364,7 +364,7 @@ importers:
     dependencies:
       '@astrojs/markdoc':
         specifier: ^1.0.0-beta.1
-        version: link:../../packages/integrations/markdoc
+        version: 1.0.0-beta.1(astro@packages+astro)
       astro:
         specifier: ^3.0.0-beta.4
         version: link:../../packages/astro
@@ -483,8 +483,8 @@ importers:
   packages/astro:
     dependencies:
       '@astrojs/compiler':
-        specifier: ^1.8.1
-        version: 1.8.1
+        specifier: ^2.0.0
+        version: 2.0.0
       '@astrojs/internal-helpers':
         specifier: workspace:*
         version: link:../internal-helpers
@@ -5191,6 +5191,15 @@ packages:
 
   /@astrojs/compiler@1.8.1:
     resolution: {integrity: sha512-C28qplQzgIJ+JU9S+1wNx+ue2KCBUp0TTAd10EWAEkk4RsL3Tzlw0BYvLDDb4KP9jS48lXmR4/1TtZ4aavYJ8Q==}
+    dev: true
+
+  /@astrojs/compiler@2.0.0:
+    resolution: {integrity: sha512-SKVWorXpOHff+OuZCd5kdTc5HxVX7bVXVXYP0jANT4crz7y2PdthUxMnE21iuYt4+Bq3aV5MId4OdgwlJ2/d/Q==}
+    dev: false
+
+  /@astrojs/internal-helpers@0.2.0-beta.1:
+    resolution: {integrity: sha512-hqeB0lAtqYy3pDI1wSNMfAAGoDIFDF8qiKZMflWiCDwvBxYBBAe26nh9llJTxtT3ycuQAUrGLK5JyI2XQMxfyg==}
+    dev: false
 
   /@astrojs/language-server@2.2.0(prettier-plugin-astro@0.11.0)(prettier@3.0.1)(typescript@5.1.6):
     resolution: {integrity: sha512-zyEumkwcep3pGyMpcEJFEn96jV6pEg3CUtjehnT9KseDFqf+gPYTbw5nwOpN9uXIJ/E5bAxhqpkr3J2LCQHRrg==}
@@ -5228,6 +5237,35 @@ packages:
       - typescript
     dev: true
 
+  /@astrojs/markdoc@1.0.0-beta.1(astro@packages+astro):
+    resolution: {integrity: sha512-KYA9kRZHIboVhOV+kVU6rDxp3x1HXFbqPezC5Ttthc4DLSXTPOlDjF1+/tZ5LhGkZTvxD0g/0PcII5X4IsciQg==}
+    engines: {node: '>=18.14.1'}
+    peerDependencies:
+      astro: '*'
+    dependencies:
+      '@astrojs/internal-helpers': 0.2.0-beta.1
+      '@astrojs/prism': 3.0.0-beta.0
+      '@markdoc/markdoc': 0.3.0
+      astro: link:packages/astro
+      esbuild: 0.18.16
+      github-slugger: 2.0.0
+      gray-matter: 4.0.3
+      htmlparser2: 9.0.0
+      kleur: 4.1.5
+      shiki: 0.14.1
+      zod: 3.20.6
+    transitivePeerDependencies:
+      - '@types/react'
+      - react
+    dev: false
+
+  /@astrojs/prism@3.0.0-beta.0:
+    resolution: {integrity: sha512-ZAPhCxhiFOyoHSf9ZXZB/cjZ+nX2crJhmGLLR8NnXwZcmMRYdkKfjnD2GrjQNPvI0lHFO42yjC4vty2heJNBlg==}
+    engines: {node: '>=18.14.1'}
+    dependencies:
+      prismjs: 1.29.0
+    dev: false
+
   /@babel/code-frame@7.22.5:
     resolution: {integrity: sha512-Xmwn266vad+6DAqEB2A6V/CcZVp62BbwVmcOJc2RPuwih1kw02TjQvWVWlcKGbBPd+8/0V5DEkOcizRGYsspYQ==}
     engines: {node: '>=6.9.0'}