diff --git a/src/delphi/train/tokenizer.py b/src/delphi/train/tokenizer.py
index 621abbe4..9f58ffba 100644
--- a/src/delphi/train/tokenizer.py
+++ b/src/delphi/train/tokenizer.py
@@ -1,6 +1,7 @@
 import os
-
 import sentencepiece as spm
+import tempfile 
+
 from datasets import Dataset
 
 
@@ -18,37 +19,31 @@ def train_vocab(
     if not os.path.exists(cache_dir):
         os.makedirs(cache_dir)
 
-    # export text as a single text file
-    text_file = os.path.join(cache_dir, "text.txt")
-    with open(text_file, 'w', encoding='utf-8') as file:
-        for item in dataset:
-            text = item[column]
-            text = text.strip()
-            file.write(text + '\n')
-    print(f"Size is: {os.path.getsize(text_file) / 1024 / 1024:.2f} MB")
-
-    # train the tokenizer
-    prefix = os.path.join(cache_dir, f"tok{vocab_size}")
-    spm.SentencePieceTrainer.train(
-        input=text_file,
-        model_prefix=prefix,
-        model_type="bpe",
-        vocab_size=vocab_size,
-        self_test_sample_size=0,
-        input_format="text",
-        character_coverage=1.0,
-        num_threads=os.cpu_count(),
-        split_digits=True,
-        allow_whitespace_only_pieces=True,
-        byte_fallback=True,
-        unk_surface=r" \342\201\207 ",
-        normalization_rule_name="identity"
-    )
-
-    # optional cleanup of the text file
-    dec = input(f"Delete the temporary file {text_file}? [y/N] ")
-    if dec.lower() == "y":
-        os.remove(text_file)
-        print(f"Deleted {text_file}")
+    with tempfile.NamedTemporaryFile(mode='w+', suffix='.json') as tmpfile:
+        
+        # export text as a single text file
+        with open(tmpfile.name, 'w', encoding='utf-8') as file:
+            for item in dataset:
+                text = item[column]
+                text = text.strip()
+                file.write(text + '\n')
+        print(f"Size is: {os.path.getsize(tmpfile.name) / 1024 / 1024:.2f} MB")
 
+        # train the tokenizer
+        prefix = os.path.join(cache_dir, f"tok{vocab_size}")
+        spm.SentencePieceTrainer.train(
+            input=tmpfile.name,
+            model_prefix=prefix,
+            model_type="bpe",
+            vocab_size=vocab_size,
+            self_test_sample_size=0,
+            input_format="text",
+            character_coverage=1.0,
+            num_threads=os.cpu_count(),
+            split_digits=True,
+            allow_whitespace_only_pieces=True,
+            byte_fallback=True,
+            unk_surface=r" \342\201\207 ",
+            normalization_rule_name="identity"
+        )
     print(f"Trained tokenizer is in {prefix}.model")