diff --git a/tests/test_openjtalk.py b/tests/test_openjtalk.py
index f372ed6..543effd 100644
--- a/tests/test_openjtalk.py
+++ b/tests/test_openjtalk.py
@@ -1,3 +1,4 @@
+import os
 import tempfile
 
 import pyopenjtalk
@@ -92,17 +93,25 @@ def test_userdic():
         p = pyopenjtalk.g2p(text)
         assert p != expected
 
-    with tempfile.NamedTemporaryFile(mode="w", encoding="utf-8", suffix=".csv") as f:
-        f.write("ｎｎｍｎ,,,1,名詞,一般,*,*,*,*,ｎｎｍｎ,ナナミン,ナナミン,1/4,*\n")  #
+    with tempfile.NamedTemporaryFile(
+        mode="w", encoding="utf-8", suffix=".csv", delete=False
+    ) as f:
+        f.write("ｎｎｍｎ,,,1,名詞,一般,*,*,*,*,ｎｎｍｎ,ナナミン,ナナミン,1/4,*\n")
         f.write("ＧＮＵ,,,1,名詞,一般,*,*,*,*,ＧＮＵ,グヌー,グヌー,2/3,*\n")
-        f.flush()
+        f.close()
 
         with tempfile.NamedTemporaryFile(
-            mode="w", encoding="utf-8", suffix=".dic"
+            mode="w",
+            encoding="utf-8",
+            suffix=".dic",
+            delete=False,
         ) as f2:
             pyopenjtalk.mecab_dict_index(f.name, f2.name)
             pyopenjtalk.update_global_jtalk_with_user_dict(f2.name)
 
+        os.remove(f.name)
+        os.remove(f2.name)
+
     for text, expected in [
         ("nnmn", "n a n a m i N"),
         ("GNU", "g u n u u"),