diff --git a/Cargo.toml b/Cargo.toml
index c38421f..73c6a0f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,7 +24,7 @@ crate-type = ["cdylib"]
 # argmin_core = { path = "../argmin-core" }
 # argmin = { path = "../argmin", features = ["ctrlc", "ndarrayl"]}
 argmin = {version = "0.2.6", features = ["ctrlc", "ndarrayl"]}
-pyo3 = { version = "0.8.5", features = ["extension-module"] }
+pyo3 = { version = "0.17.3", features = ["extension-module"] }
 serde = "1.0"
 numpy = "0.7.0"
 ndarray = "0.13"