Index: pep440-rs/Cargo.toml
===================================================================
--- pep440-rs.orig/Cargo.toml
+++ pep440-rs/Cargo.toml
@@ -37,7 +37,7 @@ crate-type = [
 version = "1.4.0"
 
 [dependencies.pyo3]
-version = "0.18.3"
+version = "0.19"
 features = [
     "extension-module",
     "abi3-py37",
