diff --git a/codex-rs/Cargo.lock b/codex-rs/Cargo.lock
index 7b90f25650..49e42f3034 100644
--- a/codex-rs/Cargo.lock
+++ b/codex-rs/Cargo.lock
@@ -5427,11 +5427,11 @@ checksum = "6184e33543162437515c2e2b48714794e37845ec9851711914eec9d308f6ebe8"
 
 [[package]]
 name = "diffy"
-version = "0.4.2"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b545b8c50194bdd008283985ab0b31dba153cfd5b3066a92770634fbc0d7d291"
+checksum = "10aec8f7f9393bd6a4f2762be0ceb012d3cbe2478987258cc9960de148561914"
 dependencies = [
- "nu-ansi-term",
+ "hashbrown 0.17.1",
 ]
 
 [[package]]
diff --git a/codex-rs/Cargo.toml b/codex-rs/Cargo.toml
index f196d154a7..267d70730f 100644
--- a/codex-rs/Cargo.toml
+++ b/codex-rs/Cargo.toml
@@ -305,7 +305,7 @@ csv = "1.3.1"
 ctor = "0.6.3"
 deno_core_icudata = "0.77.0"
 derive_more = "2"
-diffy = "0.4.2"
+diffy = "0.5.1"
 dirs = "6"
 divan = "0.1.21"
 dns-lookup = "3.0.1"