diff --git a/bindings/python/Cargo.toml b/bindings/python/Cargo.toml
index 446ab079b..f9ad0f0e8 100644
--- a/bindings/python/Cargo.toml
+++ b/bindings/python/Cargo.toml
@@ -14,7 +14,7 @@ serde = { version = "1.0", features = [ "rc", "derive" ]}
 serde_json = "1.0"
 libc = "0.2"
 env_logger = "0.10.0"
-pyo3 = { version = "0.20" }
+pyo3 = { version = "0.21" }
 numpy = "0.20.0"
 ndarray = "0.15"
 onig = { version = "6.4", default-features = false }
@@ -26,7 +26,7 @@ path = "../../tokenizers"
 
 [dev-dependencies]
 tempfile = "3.8"
-pyo3 = { version = "0.20", features = ["auto-initialize"] }
+pyo3 = { version = "0.21", features = ["auto-initialize"] }
 
 [features]
 defaut = ["pyo3/extension-module"]