diff --git a/parameterized-macro/Cargo.toml b/parameterized-macro/Cargo.toml
index 6918a9e..80bb05f 100644
--- a/parameterized-macro/Cargo.toml
+++ b/parameterized-macro/Cargo.toml
@@ -29,7 +29,7 @@ version = "2.0.38"
 features = ["full"]
 
 [dependencies.indexmap]
-version = "1.6.2"
+version = "2.1.0"
 default-features = false
 
 [dev-dependencies]