diff --git a/Cargo.lock b/Cargo.lock
index 041c80d..bcc3c5a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -523,9 +523,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.19.0"
+version = "1.20.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
+checksum = "1261fe7e33c73b354eab43b1273a57c8f967d0391e80353e51f764ac02cf6775"
 
 [[package]]
 name = "parking_lot"
diff --git a/Cargo.toml b/Cargo.toml
index c9df8c1..c75ffd5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,7 +26,7 @@ k256 = { version = "^0.13", features = ["ecdsa-core", "arithmetic", "std"], defa
 
 [dev-dependencies]
 hex = "0.4.3"
-once_cell = "1.10.0"
+once_cell = "1.20.2"
 blake2 = "0.10.4"
 k256 = "^0.13"
 ecdsa = { version = "0.16.9", features = ["verifying"] }