diff --git a/.gitignore b/.gitignore
index 4a87b23..5ff32c0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 .venv/
 __pycache__/
 *.pyc
+*.so
 rustbpe/target/
 dev-ignore/
 report.md
diff --git a/nanochat/tokenizer.py b/nanochat/tokenizer.py
index 880f854..9df5549 100644
--- a/nanochat/tokenizer.py
+++ b/nanochat/tokenizer.py
@@ -149,7 +149,7 @@ class HuggingFaceTokenizer:
 # -----------------------------------------------------------------------------
 # Tokenizer based on rustbpe + tiktoken combo
 import pickle
-import rustbpe
+from nanochat import rustbpe
 import tiktoken
 
 class RustBPETokenizer:
diff --git a/pyproject.toml b/pyproject.toml
index 3d03c4b..e06995d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,7 @@ requires = ["maturin>=1.7,<2.0"]
 build-backend = "maturin"
 
 [tool.maturin]
-module-name = "rustbpe"
+module-name = "nanochat.rustbpe"
 bindings = "pyo3"
 python-source = "."
 manifest-path = "rustbpe/Cargo.toml"
@@ -67,9 +67,15 @@ cpu = [
 gpu = [  
     "torch>=2.8.0",  
 ]  
-  
-[tool.uv]  
-conflicts = [  
+
+[tool.uv]
+cache-keys = [
+    { file = "pyproject.toml" },
+    { file = "rustbpe/src/**/*.rs" },
+    { file = "rustbpe/Cargo.toml" },
+    { file = "rustbpe/Cargo.lock" }
+]
+conflicts = [
     [  
         { extra = "cpu" },  
         { extra = "gpu" },