diff --git a/Cargo.lock b/Cargo.lock
index c0fb9cb06..54df9ed30 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1936,9 +1936,9 @@ checksum = "ce23b50ad8242c51a442f3ff322d56b02f08852c77e4c0b4d3fd684abc89c683"
 
 [[package]]
 name = "indexmap"
-version = "1.8.0"
+version = "1.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "282a6247722caba404c065016bbfa522806e51714c34f5dfc3e4a3a46fcb4223"
+checksum = "0f647032dfaa1f8b6dc29bd3edb7bbef4861b8b8007ebb118d6db284fd59f6ee"
 dependencies = [
  "autocfg 1.1.0",
  "hashbrown",
diff --git a/zebra-rpc/Cargo.toml b/zebra-rpc/Cargo.toml
index 4fa2d78c7..a35864a53 100644
--- a/zebra-rpc/Cargo.toml
+++ b/zebra-rpc/Cargo.toml
@@ -28,7 +28,7 @@ jsonrpc-derive = "18.0.0"
 jsonrpc-http-server = "18.0.0"
 # zebra-rpc needs the preserve_order feature in serde_json, which is a dependency of jsonrpc-core
 serde_json = { version = "1.0.79", features = ["preserve_order"] }
-indexmap = { version = "1.8.0", features = ["serde"] }
+indexmap = { version = "1.8.1", features = ["serde"] }
 
 tokio = { version = "1.17.0", features = ["time", "rt-multi-thread", "macros", "tracing"] }
 tower = "0.4.12"
diff --git a/zebrad/Cargo.toml b/zebrad/Cargo.toml
index e23695164..7d528bce2 100644
--- a/zebrad/Cargo.toml
+++ b/zebrad/Cargo.toml
@@ -30,7 +30,7 @@ zebra-state = { path = "../zebra-state" }
 abscissa_core = "0.5"
 gumdrop = "0.7"
 chrono = "0.4.19"
-indexmap = "1.8.0"
+indexmap = "1.8.1"
 lazy_static = "1.4.0"
 serde = { version = "1.0.136", features = ["serde_derive"] }
 toml = "0.5.8"