diff --git a/codex-rs/Cargo.lock b/codex-rs/Cargo.lock
index 853923d..2138a80 100644
--- a/codex-rs/Cargo.lock
+++ b/codex-rs/Cargo.lock
@@ -1054,7 +1054,7 @@ dependencies = [
  "escargot",
  "eventsource-stream",
  "futures",
- "indexmap 2.10.0",
+ "indexmap 2.12.0",
  "landlock",
  "libc",
  "maplit",
@@ -2572,7 +2572,7 @@ dependencies = [
  "futures-core",
  "futures-sink",
  "http",
- "indexmap 2.10.0",
+ "indexmap 2.12.0",
  "slab",
  "tokio",
  "tokio-util",
@@ -2616,6 +2616,12 @@ dependencies = [
  "foldhash",
 ]
 
+[[package]]
+name = "hashbrown"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5419bdc4f6a9207fbeba6d11b604d481addf78ecd10c11ad51e76c2f6482748d"
+
 [[package]]
 name = "heck"
 version = "0.5.0"
@@ -3045,13 +3051,14 @@ dependencies = [
 
 [[package]]
 name = "indexmap"
-version = "2.10.0"
+version = "2.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fe4cd85333e22411419a0bcae1297d25e58c9443848b11dc6a86fefe8c78a661"
+checksum = "6717a8d2a5a929a1a2eb43a12812498ed141a0bcfb7e8f7844fbdbe4303bba9f"
 dependencies = [
  "equivalent",
- "hashbrown 0.15.4",
+ "hashbrown 0.16.0",
  "serde",
+ "serde_core",
 ]
 
 [[package]]
@@ -4154,7 +4161,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b4c5cc86750666a3ed20bdaf5ca2a0344f9c67674cae0515bec2da16fbaa47db"
 dependencies = [
  "fixedbitset",
- "indexmap 2.10.0",
+ "indexmap 2.12.0",
 ]
 
 [[package]]
@@ -4222,7 +4229,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3af6b589e163c5a788fab00ce0c0366f6efbb9959c2f9874b224936af7fce7e1"
 dependencies = [
  "base64",
- "indexmap 2.10.0",
+ "indexmap 2.12.0",
  "quick-xml",
  "serde",
  "time",
@@ -4387,7 +4394,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a3ef4f2f0422f23a82ec9f628ea2acd12871c81a9362b02c43c1aa86acfc3ba1"
 dependencies = [
  "futures",
- "indexmap 2.10.0",
+ "indexmap 2.12.0",
  "nix 0.30.1",
  "tokio",
  "tracing",
@@ -5194,7 +5201,7 @@ version = "1.0.145"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "402a6f66d8c709116cf22f558eab210f5a50187f702eb4d7e5ef38d9a7f1c79c"
 dependencies = [
- "indexmap 2.10.0",
+ "indexmap 2.12.0",
  "itoa",
  "memchr",
  "ryu",
@@ -5255,7 +5262,7 @@ dependencies = [
  "chrono",
  "hex",
  "indexmap 1.9.3",
- "indexmap 2.10.0",
+ "indexmap 2.12.0",
  "schemars 0.9.0",
  "schemars 1.0.4",
  "serde",
@@ -6036,7 +6043,7 @@ version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75129e1dc5000bfbaa9fee9d1b21f974f9fbad9daec557a521ee6e080825f6e8"
 dependencies = [
- "indexmap 2.10.0",
+ "indexmap 2.12.0",
  "serde",
  "serde_spanned",
  "toml_datetime",
@@ -6060,7 +6067,7 @@ version = "0.23.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7211ff1b8f0d3adae1663b7da9ffe396eabe1ca25f0b0bee42b0da29a9ddce93"
 dependencies = [
- "indexmap 2.10.0",
+ "indexmap 2.12.0",
  "toml_datetime",
  "toml_parser",
  "toml_writer",
@@ -6119,7 +6126,7 @@ checksum = "d039ad9159c98b70ecfd540b2573b97f7f52c3e8d9f8ad57a24b916a536975f9"
 dependencies = [
  "futures-core",
  "futures-util",
- "indexmap 2.10.0",
+ "indexmap 2.12.0",
  "pin-project-lite",
  "slab",
  "sync_wrapper",
diff --git a/codex-rs/Cargo.toml b/codex-rs/Cargo.toml
index ca40b1a..d4e92b9 100644
--- a/codex-rs/Cargo.toml
+++ b/codex-rs/Cargo.toml
@@ -111,7 +111,7 @@ icu_decimal = "2.0.0"
 icu_locale_core = "2.0.0"
 ignore = "0.4.23"
 image = { version = "^0.25.8", default-features = false }
-indexmap = "2.6.0"
+indexmap = "2.12.0"
 insta = "1.43.2"
 itertools = "0.14.0"
 keyring = "3.6"