diff --git a/audiocraft/utils/cache.py b/audiocraft/utils/cache.py
index f7f82064..6ba017a7 100644
--- a/audiocraft/utils/cache.py
+++ b/audiocraft/utils/cache.py
@@ -287,6 +287,7 @@ def _load_one(self, index: int):
                     if isinstance(part[0], torch.Tensor):
                         out.append(torch.stack(part))
                     else:
+                        assert isinstance(part, torch.Tensor)
                         out.append(part)
                 return out
         except Exception:
diff --git a/requirements.txt b/requirements.txt
index e44fe159..a6fa5809 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ num2words
 numpy
 sentencepiece
 spacy==3.5.2
-torch>=2.0.0
+torch==2.1.0
 torchaudio>=2.0.0
 huggingface_hub
 tqdm
@@ -20,4 +20,4 @@ librosa
 gradio
 torchmetrics
 encodec
-protobuf
\ No newline at end of file
+protobuf