diff --git a/graphql_client_codegen/Cargo.toml b/graphql_client_codegen/Cargo.toml
index a8d03e77..5a20e1f7 100644
--- a/graphql_client_codegen/Cargo.toml
+++ b/graphql_client_codegen/Cargo.toml
@@ -10,7 +10,7 @@ edition = "2018"
 [dependencies]
 graphql-introspection-query = { version = "0.2.0", path = "../graphql-introspection-query" }
 graphql-parser = "0.4"
-heck = "0.4.0"
+heck = ">=0.4, <=0.5"
 lazy_static = "1.3"
 proc-macro2 = { version = "^1.0", features = [] }
 quote = "^1.0"