diff --git a/lib/Cargo.toml b/lib/Cargo.toml
index d6660d95..937bf5b3 100644
--- a/lib/Cargo.toml
+++ b/lib/Cargo.toml
@@ -32,7 +32,7 @@ pear = "0.0.12"
 pear_codegen = "0.0.12"
 rustls = { version = "0.11.0", optional = true }
 hyper = { version = "0.10.13", default-features = false }
-hyper-sync-rustls = { version = "0.3.0-rc.1", features = ["server"], optional = true }
+hyper-sync-rustls = { version = "=0.3.0-rc.1", features = ["server"], optional = true }
 ordermap = "0.3"
 isatty = "0.1"