diff --git a/Cargo.lock b/Cargo.lock
index dc9ea588e..3b4f7e5f4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1783,9 +1783,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.20.3"
+version = "1.21.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "945462a4b81e43c4e3ba96bd7b49d834c6f61198356aa858733bc4acf3cbe62e"
+checksum = "d75b0bedcc4fe52caa0e03d9f1151a323e4aa5e2d78ba3580400cd3c9e2bc4bc"
 
 [[package]]
 name = "oorandom"
diff --git a/src/hyperlight_host/Cargo.toml b/src/hyperlight_host/Cargo.toml
index ae0f3d445..6b18644aa 100644
--- a/src/hyperlight_host/Cargo.toml
+++ b/src/hyperlight_host/Cargo.toml
@@ -34,7 +34,7 @@ lazy_static = "1.4.0"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 log = "0.4.26"
-once_cell = { version = "1.20.3" }
+once_cell = { version = "1.21.1" }
 tracing = { version = "0.1.41", features = ["log"] }
 tracing-log = "0.2.0"
 tracing-core = "0.1.33"
diff --git a/src/hyperlight_testing/Cargo.toml b/src/hyperlight_testing/Cargo.toml
index cee179de4..969b28c23 100644
--- a/src/hyperlight_testing/Cargo.toml
+++ b/src/hyperlight_testing/Cargo.toml
@@ -5,7 +5,7 @@ edition = "2021"
 [dependencies]
 anyhow = "1.0.97"
 log = "0.4"
-once_cell = "1.20"
+once_cell = "1.21"
 tracing = { version = "0.1.41", features = ["log"] }
 tracing-log = "0.2.0"
 tracing-core = "0.1.33"