Index: pythonize/Cargo.toml
===================================================================
--- pythonize.orig/Cargo.toml
+++ pythonize/Cargo.toml
@@ -51,7 +51,7 @@ name = "test_with_serde_path_to_err"
 path = "tests/test_with_serde_path_to_err.rs"
 
 [dependencies.pyo3]
-version = "0.28"
+version = ">=0.27,<0.29"
 default-features = false
 
 [dependencies.serde]
@@ -69,7 +69,7 @@ default-features = false
 version = "1.0.2"
 
 [dev-dependencies.pyo3]
-version = "0.28"
+version = ">=0.27,<0.29"
 features = [
     "auto-initialize",
     "macros",
