diff --git a/docs/hazmat/primitives/asymmetric/serialization.rst b/docs/hazmat/primitives/asymmetric/serialization.rst
index 4d079b5..8d32ae5 100644
--- a/docs/hazmat/primitives/asymmetric/serialization.rst
+++ b/docs/hazmat/primitives/asymmetric/serialization.rst
@@ -21,7 +21,7 @@
 
 .. function:: load_pem_traditional_openssl_private_key(data, password, backend)
 
-    .. versionadded:: 0.4
+    .. versionadded:: 0.5
 
     Deserialize a private key from PEM encoded data to one of the supported
     asymmetric private key types.