diff --git a/Cargo.toml b/Cargo.toml
index 42e5c4f..3196d19 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,7 +15,7 @@ pyo3 = { version = ">=0.16.5,<0.17", features = ["extension-module", "num-bigint
 thiserror = ">=1.0.37,<2"
 utf8-chars = ">=2.0.2,<3"
 compact_str = ">=0.7.1,<0.8"
-utf8-io = ">=0.16.0,<0.17"
+utf8-io = ">=0.16.0, <0.20"
 utf8-read = ">=0.4.0,<0.5"
 utf8-width = ">=0.1.6,<0.2"