diff --git a/generator/Cargo.toml b/generator/Cargo.toml
index 437aa576f..6e83ec048 100644
--- a/generator/Cargo.toml
+++ b/generator/Cargo.toml
@@ -11,7 +11,7 @@ publish = false
 # file is generated as currently checked in): 
 bindgen = "=0.69.4"
 heck = "0.5"
-itertools = "0.12"
+itertools = "0.13"
 nom = "7.1"
 once_cell = "1.7"
 proc-macro2 = "1.0"