diff --git a/Cargo.toml b/Cargo.toml
index 549adaf5c1e..d3465a9e851 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -113,7 +113,7 @@ env_logger = "0.9"
 error-chain = "0.12"
 ethereum-types = "0.14"
 ethereum_hashing = "1.0.0-beta.2"
-ethereum_serde_utils = "0.5"
+ethereum_serde_utils = "0.5.2"
 ethereum_ssz = "0.5"
 ethereum_ssz_derive = "0.5"
 ethers-core = "1"