diff --git a/package.json b/package.json
index d206143ce..1da6621cf 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
     "build": "turbo run build",
     "build:pm": "turbo run build --filter=@tiptap/pm",
     "build:demos": "npm run build:demos --workspace demos",
-    "serve": "npm run build:demos && npm --prefix ./demos run preview",
+    "serve": "npm run build:demos && npx http-server ./demos/dist -p 3000",
     "build:ci": "turbo run build",
     "publish": "npm run build && npm run changeset publish",
     "clean:packages": "rm -rf ./packages/*/dist && rm -rf ./packages/pm/*/dist",
diff --git a/packages/extension-subscript/src/subscript.ts b/packages/extension-subscript/src/subscript.ts
index d42f83f56..2719f1d81 100644
--- a/packages/extension-subscript/src/subscript.ts
+++ b/packages/extension-subscript/src/subscript.ts
@@ -1,4 +1,5 @@
 import { Mark, mergeAttributes } from '@tiptap/core'
+import type { StyleParseRule } from '@tiptap/pm/model'
 
 export interface SubscriptExtensionOptions {
   /**
@@ -60,7 +61,7 @@ export const Subscript = Mark.create<SubscriptExtensionOptions>({
           // If it falls through we’ll match, and this mark will be applied.
           return null
         },
-      },
+      } as StyleParseRule,
     ]
   },
 
diff --git a/packages/extension-superscript/src/superscript.ts b/packages/extension-superscript/src/superscript.ts
index 9fce9cab2..77fdd50c5 100644
--- a/packages/extension-superscript/src/superscript.ts
+++ b/packages/extension-superscript/src/superscript.ts
@@ -1,4 +1,5 @@
 import { Mark, mergeAttributes } from '@tiptap/core'
+import type { StyleParseRule } from '@tiptap/pm/model'
 
 export interface SuperscriptExtensionOptions {
   /**
@@ -60,7 +61,7 @@ export const Superscript = Mark.create<SuperscriptExtensionOptions>({
           // If it falls through we’ll match, and this mark will be applied.
           return null
         },
-      },
+      } as StyleParseRule,
     ]
   },