diff --git a/MODULE.bazel.lock b/MODULE.bazel.lock
index 02cdb765f..59af8795d 100644
--- a/MODULE.bazel.lock
+++ b/MODULE.bazel.lock
@@ -856,7 +856,7 @@
       "deunicode_1.6.2": "{\"dependencies\":[],\"features\":{\"alloc\":[],\"default\":[\"alloc\"]}}",
       "diff_0.1.13": "{\"dependencies\":[{\"kind\":\"dev\",\"name\":\"criterion\",\"req\":\"^0.3.5\"},{\"kind\":\"dev\",\"name\":\"quickcheck\",\"req\":\"^1.0.3\"},{\"kind\":\"dev\",\"name\":\"speculate\",\"req\":\"^0.1.2\"}],\"features\":{}}",
       "difflib_0.4.0": "{\"dependencies\":[],\"features\":{}}",
-      "diffy_0.4.2": "{\"dependencies\":[{\"name\":\"nu-ansi-term\",\"req\":\"^0.50\"}],\"features\":{}}",
+      "diffy_0.5.1": "{\"dependencies\":[{\"default_features\":false,\"name\":\"anstyle\",\"optional\":true,\"req\":\"^1.0.13\"},{\"default_features\":false,\"features\":[\"default-hasher\"],\"name\":\"hashbrown\",\"req\":\"^0.17.0\"},{\"kind\":\"dev\",\"name\":\"rayon\",\"req\":\"^1.10.0\"},{\"features\":[\"dir\"],\"kind\":\"dev\",\"name\":\"snapbox\",\"req\":\"^0.6.24\"},{\"default_features\":false,\"features\":[\"c-allocator\"],\"name\":\"zlib-rs\",\"optional\":true,\"req\":\"^0.6.3\"}],\"features\":{\"binary\":[\"dep:zlib-rs\"],\"color\":[\"dep:anstyle\"],\"default\":[],\"std\":[]}}",
       "digest_0.10.7": "{\"dependencies\":[{\"name\":\"blobby\",\"optional\":true,\"req\":\"^0.3\"},{\"name\":\"block-buffer\",\"optional\":true,\"req\":\"^0.10\"},{\"name\":\"const-oid\",\"optional\":true,\"req\":\"^0.9\"},{\"name\":\"crypto-common\",\"req\":\"^0.1.3\"},{\"default_features\":false,\"name\":\"subtle\",\"optional\":true,\"req\":\"^2.4\"}],\"features\":{\"alloc\":[],\"core-api\":[\"block-buffer\"],\"default\":[\"core-api\"],\"dev\":[\"blobby\"],\"mac\":[\"subtle\"],\"oid\":[\"const-oid\"],\"rand_core\":[\"crypto-common/rand_core\"],\"std\":[\"alloc\",\"crypto-common/std\"]}}",
       "digest_0.11.3": "{\"dependencies\":[{\"name\":\"blobby\",\"optional\":true,\"req\":\"^0.4\"},{\"name\":\"block-buffer\",\"optional\":true,\"req\":\"^0.12\"},{\"name\":\"common\",\"package\":\"crypto-common\",\"req\":\"^0.2\"},{\"name\":\"const-oid\",\"optional\":true,\"req\":\"^0.10\"},{\"name\":\"ctutils\",\"optional\":true,\"req\":\"^0.4\"},{\"kind\":\"dev\",\"name\":\"sha2\",\"req\":\"^0.11\"},{\"default_features\":false,\"name\":\"zeroize\",\"optional\":true,\"req\":\"^1.7\"}],\"features\":{\"alloc\":[],\"block-api\":[\"dep:block-buffer\"],\"default\":[\"block-api\"],\"dev\":[\"blobby\"],\"getrandom\":[\"common/getrandom\",\"rand_core\"],\"mac\":[\"dep:ctutils\"],\"oid\":[\"dep:const-oid\"],\"rand_core\":[\"common/rand_core\"],\"zeroize\":[\"dep:zeroize\",\"block-buffer?/zeroize\"]}}",
       "diplomat-runtime_0.15.1": "{\"dependencies\":[{\"name\":\"jni\",\"optional\":true,\"req\":\"^0.22\"},{\"name\":\"log\",\"optional\":true,\"req\":\"^0.4\"}],\"features\":{\"jvm-callback-support\":[\"dep:jni\"],\"log\":[\"dep:log\"]}}",
diff --git a/codex-rs/Cargo.lock b/codex-rs/Cargo.lock
index a1b822090..eb73bf89d 100644
--- a/codex-rs/Cargo.lock
+++ b/codex-rs/Cargo.lock
@@ -5323,11 +5323,11 @@ 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]]
@@ -7409,6 +7409,9 @@ name = "hashbrown"
 version = "0.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ed5909b6e89a2db4456e54cd5f673791d7eca6732202bbf2a9cc504fe2f9b84a"
+dependencies = [
+ "foldhash 0.2.0",
+]
 
 [[package]]
 name = "hashlink"
diff --git a/codex-rs/Cargo.toml b/codex-rs/Cargo.toml
index 589fbf1b9..8817e401b 100644
--- a/codex-rs/Cargo.toml
+++ b/codex-rs/Cargo.toml
@@ -297,7 +297,7 @@ csv = "1.3.1"
 ctor = "1.0.7"
 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"