diff --git a/Cargo.toml b/Cargo.toml
index 595db37..5be98de 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,7 +24,7 @@ members = [".", "./wasm"]
 [dependencies]
 bytecount = "0.6"
 chrono = { version = "0.4", optional = true }
-indexmap = { version = "1.9", optional = true }
+indexmap = { version = "2.1", optional = true }
 jetscii = "0.5"
 memchr = "2.5"
 nom = { version = "7.1", default-features = false, features = ["std"] }