diff --git a/Cargo.toml b/Cargo.toml
index d8c76a9c..906b4690 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -61,7 +61,7 @@ byteorder = { version = "1.4.2", default-features = false }
 hex = { version = "0.4", default-features = false }
 num-bigint = "0.4.0"
 rug = { version = "1.6.0", default-features = false }
-jsonschema = { version = "0.23", default-features = false }
+jsonschema = { version = "0.40", default-features = false }
 serde_derive = "1.0.101"
 
 ethbloom = { path = "./ethbloom", default-features = false }
diff --git a/primitive-types/src/json_schema.rs b/primitive-types/src/json_schema.rs
index 8c2be25c..f528f1d8 100644
--- a/primitive-types/src/json_schema.rs
+++ b/primitive-types/src/json_schema.rs
@@ -53,10 +53,7 @@ mod tests {
 			.build(&schema_json)
 			.unwrap();
 		let value = serde_json::to_value("0x55086adeca661185c437d92b9818e6eda6d0d047").unwrap();
-		schema
-			.validate(&value)
-			.map_err(|e| e.into_iter().map(|e| e.to_string()).collect::<Vec<_>>())
-			.unwrap();
+		schema.validate(&value).unwrap();
 		let value = serde_json::to_value("0X0E9C8DA9FD4BDD3281879D9E328D8D74D02558CC").unwrap();
 		assert!(schema.validate(&value).is_ok());