diff --git a/spec/fixtures/components/rust_app/Cargo.lock b/spec/fixtures/components/rust_app/Cargo.lock
index 775f799..8d1dbd6 100644
--- a/spec/fixtures/components/rust_app/Cargo.lock
+++ b/spec/fixtures/components/rust_app/Cargo.lock
@@ -121,9 +121,9 @@ checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
 
 [[package]]
 name = "once_cell"
-version = "1.21.3"
+version = "1.21.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "42f5e15c9953c5e4ccceeb2e7382a716482c34515315f7b03532b8b4e8393d2d"
+checksum = "9f7c3e4beb33f85d45ae3e3a1792185706c8e16d043238c593331cc7cd313b50"
 
 [[package]]
 name = "prettyplease"
diff --git a/spec/fixtures/components/rust_app/Cargo.toml b/spec/fixtures/components/rust_app/Cargo.toml
index 7d312d2..240c26c 100644
--- a/spec/fixtures/components/rust_app/Cargo.toml
+++ b/spec/fixtures/components/rust_app/Cargo.toml
@@ -10,6 +10,6 @@ crate-type = ["cdylib"]
 # https://crates.io/crates/wit-bindgen
 wit-bindgen = "0.48"
 serde_json = "1.0.145"
-once_cell = "1.21.3"
+once_cell = "1.21.4"
 ctor = "0.4.2"
 base64 = "0.22"