diff --git a/Cargo.toml b/Cargo.toml
index dc9b2443..0066f62a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,7 +15,7 @@ python = ["dep:numpy", "dep:pyo3"]
 
 [dependencies]
 numpy = {version = "0.20", optional = true}
-pyo3 = {version = "0.20", features = ["extension-module"], optional = true}
+pyo3 = {version = "0.21", features = ["extension-module"], optional = true}
 rand = "0.8.5"
 rand_distr = "0.4.3"