diff --git a/diffctx/Cargo.lock b/diffctx/Cargo.lock
index 38d16743..01c5b0dc 100644
--- a/diffctx/Cargo.lock
+++ b/diffctx/Cargo.lock
@@ -769,9 +769,12 @@ checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
 
 [[package]]
 name = "similar"
-version = "2.7.0"
+version = "3.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bbbb5d9659141646ae647b42fe094daf6c6192d1620870b449d9557f748b2daa"
+checksum = "e6505efef05804732ed8a3f2d4f279429eb485bd69d5b0cc6b19cc02005cda16"
+dependencies = [
+ "bstr",
+]
 
 [[package]]
 name = "smallvec"
diff --git a/diffctx/Cargo.toml b/diffctx/Cargo.toml
index 7661e5d1..2525ef19 100644
--- a/diffctx/Cargo.toml
+++ b/diffctx/Cargo.toml
@@ -116,7 +116,7 @@ tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 regex = "1"
 once_cell = "1"
 rustc-hash = "2"
-similar = "2"
+similar = "3"
 glob = "0.3"
 smallvec = "1"
 walkdir = "2"