diff --git a/extensions/underthesea_core/Cargo.toml b/extensions/underthesea_core/Cargo.toml
index d3b549b5..a8563cd8 100644
--- a/extensions/underthesea_core/Cargo.toml
+++ b/extensions/underthesea_core/Cargo.toml
@@ -31,7 +31,7 @@ rayon = "1.5"
 crfs = "0.1"
 
 [dependencies.pyo3]
-version = "0.15.0"
+version = "0.21"
 features = ["extension-module"]
 
 [dev-dependencies]
diff --git a/extensions/underthesea_core/pyproject.toml b/extensions/underthesea_core/pyproject.toml
index 7696f9df..f7896102 100644
--- a/extensions/underthesea_core/pyproject.toml
+++ b/extensions/underthesea_core/pyproject.toml
@@ -9,10 +9,10 @@ repository = "https://github.com/undertheseanlp/underthesea/"
 homepage = "https://github.com/undertheseanlp/underthesea/tree/main/extensions/underthesea_core"
 
 [tool.poetry.dependencies]
-python = "^3.5"
+python = "^3.8"
 
 [tool.poetry.dev-dependencies]
-maturin = "^0.9.4"
+maturin = "^1.6.0"
 
 [build-system]
 requires = ["setuptools"]