diff --git a/.github/actions/prepare/action.yml b/.github/actions/prepare/action.yml
index c8d87aaf..cb825e62 100644
--- a/.github/actions/prepare/action.yml
+++ b/.github/actions/prepare/action.yml
@@ -8,7 +8,7 @@ runs:
     - uses: actions/setup-node@v4
       with:
         cache: pnpm
-        node-version: "18"
+        node-version: "20"
     - run: pnpm install --frozen-lockfile
       shell: bash
   using: composite
diff --git a/knip.jsonc b/knip.jsonc
index ca6ceda5..71f09088 100644
--- a/knip.jsonc
+++ b/knip.jsonc
@@ -3,5 +3,5 @@
 	"entry": ["src/index.ts!"],
 	"ignoreDependencies": ["sentences-per-line"],
 	"ignoreExportsUsedInFile": { "interface": true, "type": true },
-	"project": ["src/**/*.ts!"]
+	"project": ["src/**/*.ts!"],
 }
diff --git a/src/sentences-per-line.test.ts b/src/sentences-per-line.test.ts
index 92697ec4..0c738850 100644
--- a/src/sentences-per-line.test.ts
+++ b/src/sentences-per-line.test.ts
@@ -1,4 +1,4 @@
-import markdownlint from "markdownlint";
+import * as markdownlint from "markdownlint/sync";
 import { describe, expect, test } from "vitest";
 
 import { sentencesPerLine } from "./sentences-per-line.js";
@@ -47,7 +47,7 @@ Abc. Def.
 			6,
 		],
 	])("%s", (input, errorContext, lineNumber = 1) => {
-		const actual = markdownlint.sync({
+		const actual = markdownlint.lint({
 			config: {
 				default: false,
 				"sentences-per-line": true,
@@ -69,7 +69,7 @@ Abc. Def.
 							ruleInformation: null,
 							ruleNames: ["sentences-per-line"],
 						},
-				  ]
+					]
 				: [],
 		});
 	});
diff --git a/tsconfig.json b/tsconfig.json
index d6bc00fe..4a2d4beb 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -3,8 +3,8 @@
 		"declaration": true,
 		"declarationMap": true,
 		"esModuleInterop": true,
-		"module": "CommonJS",
-		"moduleResolution": "Node10",
+		"module": "preserve",
+		"moduleResolution": "bundler",
 		"noEmit": true,
 		"outDir": "lib",
 		"resolveJsonModule": true,