diff --git a/halo2_backend/Cargo.toml b/halo2_backend/Cargo.toml
index 807436a131..116c5e6162 100644
--- a/halo2_backend/Cargo.toml
+++ b/halo2_backend/Cargo.toml
@@ -39,6 +39,7 @@ serde_derive = { version = "1", optional = true}
 rayon = "1.8"
 halo2_middleware = { path = "../halo2_middleware" }
 halo2_common = { path = "../halo2_common" }
+itertools = "0.12"
 
 [dev-dependencies]
 assert_matches = "1.5"
diff --git a/halo2_common/Cargo.toml b/halo2_common/Cargo.toml
index 4f60dbfa11..5361216ed2 100644
--- a/halo2_common/Cargo.toml
+++ b/halo2_common/Cargo.toml
@@ -35,6 +35,7 @@ serde = { version = "1", optional = true, features = ["derive"] }
 serde_derive = { version = "1", optional = true}
 rayon = "1.8"
 halo2_middleware = { path = "../halo2_middleware" }
+itertools = "0.12"
 
 # Legacy circuit compatibility
 halo2_legacy_pdqsort = { version = "0.1.0", optional = true }