diff --git a/Cargo.toml b/Cargo.toml
index 4203f6d..c0e1a77 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,7 +11,7 @@ categories = ["network-programming", "parser-implementations"]
 edition = "2021"
 
 [dependencies]
-serde = { version = "1", optional = true }
+serde = { version = "1.0.199", optional = true }
 schemars = { version = "0.8.17", optional = true }
 
 [dev-dependencies]