diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 24973280..297c1c01 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -18,7 +18,7 @@ jobs:
 
     strategy:
       matrix:
-        rust: [1.57.0, stable, nightly]
+        rust: [1.64.0, stable, nightly]
 
     steps:
       - uses: actions/checkout@v3
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 56d0092c..84449b1c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add `compact_maps` and `compact_structs` options to `PrettyConfig` to allow serialising maps and structs on a single line ([#448](https://github.com/ron-rs/ron/pull/448))
 - Add minimal support for `#[serde(flatten)]` with roundtripping through RON maps ([#455](https://github.com/ron-rs/ron/pull/455))
 - Breaking: Bump `bitflags` dependency to 2.0, changes `serde` impls of `Extensions` ([#443](https://github.com/ron-rs/ron/pull/443))
+- Bump MSRV to 1.64.0 and bump dependency: `indexmap` to 2.0 ([#459](https://github.com/ron-rs/ron/pull/459))
 
 ## [0.8.0] - 2022-08-17
 
diff --git a/Cargo.toml b/Cargo.toml
index 5d8c90b1..5d5dbd70 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,7 +17,7 @@ readme = "README.md"
 homepage = "https://github.com/ron-rs/ron"
 repository = "https://github.com/ron-rs/ron"
 documentation = "https://docs.rs/ron/"
-rust-version = "1.57.0"
+rust-version = "1.64.0"
 
 [features]
 default = []
@@ -26,7 +26,7 @@ integer128 = []
 [dependencies]
 base64 = "0.21"
 bitflags = { version = "2.0", features = ["serde"] }
-indexmap = { version = "1.9", features = ["serde-1"], optional = true }
+indexmap = { version = "2.0", features = ["serde"], optional = true }
 # serde supports i128/u128 from 1.0.60 onwards
 serde = "1.0.60"
 serde_derive = "1.0"
diff --git a/README.md b/README.md
index 8ba55fd7..52b9e021 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 [![CI](https://github.com/ron-rs/ron/actions/workflows/ci.yaml/badge.svg)](https://github.com/ron-rs/ron/actions/workflows/ci.yaml)
 [![codecov](https://img.shields.io/codecov/c/github/ron-rs/ron/codecov?token=x4Q5KA51Ul)](https://codecov.io/gh/ron-rs/ron)
 [![Crates.io](https://img.shields.io/crates/v/ron.svg)](https://crates.io/crates/ron)
-[![MSRV](https://img.shields.io/badge/MSRV-1.57.0-orange)](https://github.com/ron-rs/ron)
+[![MSRV](https://img.shields.io/badge/MSRV-1.64.0-orange)](https://github.com/ron-rs/ron)
 [![Docs](https://docs.rs/ron/badge.svg)](https://docs.rs/ron)
 [![Matrix](https://img.shields.io/matrix/ron-rs:matrix.org.svg)](https://matrix.to/#/#ron-rs:matrix.org)
 
diff --git a/clippy.toml b/clippy.toml
index 28c44eb0..cb8cfcd1 100644
--- a/clippy.toml
+++ b/clippy.toml
@@ -1,2 +1,2 @@
-msrv = "1.57.0"
+msrv = "1.64.0"
 blacklisted-names = []