diff --git a/src/module/get-content-type.ts b/src/module/get-content-type.ts
index 9107db4..5171bf3 100644
--- a/src/module/get-content-type.ts
+++ b/src/module/get-content-type.ts
@@ -10,6 +10,8 @@ export const getTextContentType = (ext: string) => {
     '.mjs',
     '.map',
     '.json5',
+    '.pem',
+    '.crt',
   ];
   const include = textContentTypes.includes(ext);
   if (!include) {