diff --git a/diffctx/Cargo.lock b/diffctx/Cargo.lock
index e7dd2a7c..ac68e697 100644
--- a/diffctx/Cargo.lock
+++ b/diffctx/Cargo.lock
@@ -355,12 +355,6 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
-[[package]]
-name = "hermit-abi"
-version = "0.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc0fef456e4baa96da950455cd02c081ca953b141298e41db3fc7e36b1da849c"
-
 [[package]]
 name = "id-arena"
 version = "2.3.0"
@@ -420,14 +414,14 @@ dependencies = [
 
 [[package]]
 name = "libtest-mimic"
-version = "0.7.3"
+version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cc0bda45ed5b3a2904262c1bb91e526127aa70e7ef3758aba2ef93cf896b9b58"
+checksum = "14e6ba06f0ade6e504aff834d7c34298e5155c6baca353cc6a4aaff2f9fd7f33"
 dependencies = [
+ "anstream",
+ "anstyle",
  "clap",
  "escape8259",
- "termcolor",
- "threadpool",
 ]
 
 [[package]]
@@ -475,16 +469,6 @@ dependencies = [
  "windows-sys",
 ]
 
-[[package]]
-name = "num_cpus"
-version = "1.17.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91df4bbde75afed763b708b7eee1e8e7651e02d97f6d5dd763e89367e957b23b"
-dependencies = [
- "hermit-abi",
- "libc",
-]
-
 [[package]]
 name = "once_cell"
 version = "1.21.4"
@@ -818,15 +802,6 @@ dependencies = [
  "windows-sys",
 ]
 
-[[package]]
-name = "termcolor"
-version = "1.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "06794f8f6c5c898b3275aebefa6b8a1cb24cd2c6c79397ab15774837a0bc5755"
-dependencies = [
- "winapi-util",
-]
-
 [[package]]
 name = "thiserror"
 version = "2.0.18"
@@ -856,15 +831,6 @@ dependencies = [
  "cfg-if",
 ]
 
-[[package]]
-name = "threadpool"
-version = "1.8.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d050e60b33d41c19108b32cea32164033a9013fe3b46cbd4457559bfbf77afaa"
-dependencies = [
- "num_cpus",
-]
-
 [[package]]
 name = "tiktoken-rs"
 version = "0.12.0"
diff --git a/diffctx/Cargo.toml b/diffctx/Cargo.toml
index cf8573aa..7ac2e3b2 100644
--- a/diffctx/Cargo.toml
+++ b/diffctx/Cargo.toml
@@ -126,7 +126,7 @@ pyo3 = { version = "0.29", features = ["extension-module", "abi3-py310"], option
 [dev-dependencies]
 tempfile = "3"
 serde_yaml = "0.9"
-libtest-mimic = "0.7"
+libtest-mimic = "0.8"
 
 [[test]]
 name = "yaml_cases"