diff --git a/Cargo.toml b/Cargo.toml
index c31354942a5..6eae090192e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -206,7 +206,7 @@ email_address = "0.2.4"
 enum-as-inner = "0.6"
 enum-map = "2.6.3"
 env_logger = "0.10"
-ethnum = { version = "1.5.0", features = ["serde"] }
+ethnum = { version = "=1.5.3", features = ["serde"] }
 flate2 = "1.0.24"
 foldhash = "0.2.0"
 fs-err = "2.9.0"