diff --git a/Cargo.toml b/Cargo.toml
index 899c4ef..8684be7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,7 +14,7 @@ crate-type = ["cdylib", "rlib"]
 
 [dependencies]
 serde = {version = "1.0.102", features=["std", "derive"]}
-pyo3 = {version = "0.8.4", features=["extension-module"], optional = true }
+pyo3 = {version = "0.9", features=["extension-module"], optional = true }
 
 [dev-dependencies]
 criterion = "0.3"
diff --git a/deny.toml b/deny.toml
index abbab9d..d3e3be5 100644
--- a/deny.toml
+++ b/deny.toml
@@ -71,6 +71,7 @@ unlicensed = "deny"
 # [possible values: any SPDX 3.7 short identifier (+ optional exception)].
 allow = [
     "MIT",
+    "BSD-2-Clause",
     "Apache-2.0",
     #"Apache-2.0 WITH LLVM-exception",
 ]