diff --git a/Cargo.toml b/Cargo.toml
index 24c0e47..b32fd0d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,7 @@ edition = "2018"
 
 [dependencies]
 alga = "0.9"
-itertools = "0.8"
+itertools = "0.9"
 obj = "0.9"
 quickcheck = "0.9"
 quickcheck_macros = "0.8"