diff --git a/create_void.py b/create_void.py
index e1858fc..1f15896 100644
--- a/create_void.py
+++ b/create_void.py
@@ -1,15 +1,16 @@
 import sys
 from datetime import datetime
 
-def create_void_description(date_str: str) -> str:
-    issued = datetime.strptime(date_str, '%Y%m%d').strftime('%Y-%m-%d')
+
+def create_void_description(version: str) -> str:
+    issued = datetime.strptime(version, "%Y%m%d").strftime("%Y-%m-%d")
 
     data_dump_statements = ""
-    with open(f"./versions/{date_str}.txt") as f:
+    with open(f"./versions/{version}.txt") as f:
         urls = f.read().splitlines()
         for url in urls:
             data_dump_statements += f"        void:dataDump <{url}> ;\n"
-    
+
     return f"""
 @prefix dcterms: <http://purl.org/dc/terms/> .
 @prefix void: <http://rdfs.org/ns/void#> .
@@ -28,9 +29,10 @@ def create_void_description(date_str: str) -> str:
 }}
 """.strip()
 
-if __name__ == '__main__':
+
+if __name__ == "__main__":
     if len(sys.argv) != 2:
-        print('Please specify date.', file=sys.stderr)
+        print("Please specify date.", file=sys.stderr)
         exit(1)
 
-    print(create_void_description(sys.argv[1]))
\ No newline at end of file
+    print(create_void_description(sys.argv[1]))
diff --git a/versions/latest.txt b/versions/latest.txt
deleted file mode 100644
index cc30db2..0000000
--- a/versions/latest.txt
+++ /dev/null
@@ -1,24 +0,0 @@
-https://mediag.bunka.go.jp/mediaarts-db/metadata_cm-item_cm101_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_cm-item_cm102_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_cm-item_cm103_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_cm-col_cm104_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_cm-col_cm105_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_cm-col_cm106_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_cm-auth_cm108_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_cm-auth_cm109_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_an-item_an201_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_an-item_an202_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_an-item_an205_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_an-col_an207_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_an-col_an208_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_an-col_an209_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_an-col_an210_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_an-auth_an216_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_gm-item_gm301_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_gm-col_gm305_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_gm-col_gm306_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_gm-auth_gm315_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_ma-item_ma401_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_ma-col_ma408_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_co-curate_co504_ttl.zip
-https://mediag.bunka.go.jp/mediaarts-db/metadata_co-curate_co505_ttl.zip
\ No newline at end of file