diff --git a/Cargo.toml b/Cargo.toml
index d968cb1..6846c43 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ edition = "2018"
 
 [dependencies]
 indexmap = "1.0"
-itertools = "0.8.0"
+itertools = "0.9"
 rustpython-bytecode = { path = "../bytecode", version = "0.1.1" }
 rustpython-parser = { path = "../parser", version = "0.1.1" }
 num-complex = { version = "0.2", features = ["serde"] }