diff --git a/python/argmin-testfunctions-py/Cargo.toml b/python/argmin-testfunctions-py/Cargo.toml
index 29e4d5f86..c427470df 100644
--- a/python/argmin-testfunctions-py/Cargo.toml
+++ b/python/argmin-testfunctions-py/Cargo.toml
@@ -20,4 +20,4 @@ crate-type = ["cdylib"]
 [dependencies]
 argmin_testfunctions = { version = "0.2.0", path = "../../crates/argmin-testfunctions" }
 paste = "1"
-pyo3 = "0.20"
+pyo3 = "0.20.2"