diff --git a/Cargo.toml b/Cargo.toml
index f10e46c25faccd..c856b16ce38a9a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -87,7 +87,7 @@ flate2 = "=1.0.24"
 futures = "0.3.21"
 http = "=0.2.8"
 hyper = "0.14.18"
-indexmap = "1.9.2"
+indexmap = { version = "1.9.2", features = ["serde"] }
 libc = "0.2.126"
 log = "=0.4.17"
 lzzzz = "1.0"