diff --git a/requirements.txt b/requirements.txt
index c1a1306..6d4dae0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,8 +21,7 @@ fugashi
 num2words
 PyYAML
 requests
-pyopenjtalk; sys_platform == 'linux'
-openjtalk; sys_platform != 'linux'
+pyopenjtalk-prebuilt
 jaconv
 psutil
 GPUtil