diff --git a/bindings/rust/integration/Cargo.toml b/bindings/rust/integration/Cargo.toml
index 6ba02e2ecb2..a229b2df586 100644
--- a/bindings/rust/integration/Cargo.toml
+++ b/bindings/rust/integration/Cargo.toml
@@ -10,6 +10,7 @@ s2n-tls = { path = "../s2n-tls"}
 s2n-tls-sys = { path = "../s2n-tls-sys" }
 criterion = { version = "0.3", features = ["html_reports"] }
 anyhow = "1"
+unicode-width = "=0.1.13" # newer versions require newer rust, see https://github.com/aws/s2n-tls/issues/4786
 
 [[bench]]
 name = "s2nc"