diff --git a/Cargo.lock b/Cargo.lock
index 041c80d..8d80b96 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -523,9 +523,12 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.19.0"
+version = "1.20.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
+checksum = "82881c4be219ab5faaf2ad5e5e5ecdff8c66bd7402ca3160975c93b24961afd1"
+dependencies = [
+ "portable-atomic",
+]
 
 [[package]]
 name = "parking_lot"
@@ -578,6 +581,12 @@ version = "0.3.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d231b230927b5e4ad203db57bbcbee2802f6bce620b1e4a9024a07d94e2907ec"
 
+[[package]]
+name = "portable-atomic"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cc9c68a3f6da06753e9335d63e27f6b9754dd1920d941135b7ea8224f141adb2"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.86"
diff --git a/Cargo.toml b/Cargo.toml
index c9df8c1..b6e1e3c 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 = "1.20.1"
 blake2 = "0.10.4"
 k256 = "^0.13"
 ecdsa = { version = "0.16.9", features = ["verifying"] }