diff --git a/src/channels/plugins/module-loader.test.ts b/src/channels/plugins/module-loader.test.ts
index 0487eac5f83..e895e9859c7 100644
--- a/src/channels/plugins/module-loader.test.ts
+++ b/src/channels/plugins/module-loader.test.ts
@@ -46,15 +46,17 @@ describe("channel plugin module loader helpers", () => {
 
   it("resolves plugin module candidates and picks the first existing extension", () => {
     const rootDir = createTempDir();
-    const expectedPath = path.join(rootDir, "src", "checker.mjs");
+    const expectedPath = path.join(rootDir, "src", "checker.mts");
     fs.mkdirSync(path.dirname(expectedPath), { recursive: true });
     fs.writeFileSync(expectedPath, "export const ok = true;\n", "utf8");
 
     expect(resolvePluginModuleCandidates(rootDir, "./src/checker")).toEqual([
       path.join(rootDir, "src", "checker"),
       path.join(rootDir, "src", "checker.ts"),
+      path.join(rootDir, "src", "checker.mts"),
       path.join(rootDir, "src", "checker.js"),
       path.join(rootDir, "src", "checker.mjs"),
+      path.join(rootDir, "src", "checker.cts"),
       path.join(rootDir, "src", "checker.cjs"),
     ]);
     expect(resolveExistingPluginModulePath(rootDir, "./src/checker")).toBe(expectedPath);
diff --git a/src/channels/plugins/module-loader.ts b/src/channels/plugins/module-loader.ts
index f54388679ce..9fe38f634a8 100644
--- a/src/channels/plugins/module-loader.ts
+++ b/src/channels/plugins/module-loader.ts
@@ -53,8 +53,10 @@ export function resolvePluginModuleCandidates(rootDir: string, specifier: string
   return [
     resolvedPath,
     `${resolvedPath}.ts`,
+    `${resolvedPath}.mts`,
     `${resolvedPath}.js`,
     `${resolvedPath}.mjs`,
+    `${resolvedPath}.cts`,
     `${resolvedPath}.cjs`,
   ];
 }