diff --git a/Cargo.lock b/Cargo.lock
index 5d3b38a2..0d329ae5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -274,9 +274,9 @@ dependencies = [
 
 [[package]]
 name = "critical-section"
-version = "1.1.1"
+version = "1.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6548a0ad5d2549e111e1f6a11a6c2e2d00ce6a3dafe22948d67c2b443f775e52"
+checksum = "f64009896348fc5af4222e9cf7d7d82a95a256c634ebcf61c53e4ea461422242"
 
 [[package]]
 name = "crossbeam-channel"
@@ -606,7 +606,7 @@ dependencies = [
 
 [[package]]
 name = "k256"
-version = "0.14.0-pre.1"
+version = "0.14.0-pre.2"
 dependencies = [
  "blobby",
  "cfg-if",
@@ -730,9 +730,9 @@ 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"
 dependencies = [
  "critical-section",
  "portable-atomic",
@@ -869,9 +869,9 @@ dependencies = [
 
 [[package]]
 name = "portable-atomic"
-version = "1.6.0"
+version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7170ef9988bc169ba16dd36a7fa041e5c4cbeb6a35b76d4c03daded371eae7c0"
+checksum = "cc9c68a3f6da06753e9335d63e27f6b9754dd1920d941135b7ea8224f141adb2"
 
 [[package]]
 name = "ppv-lite86"
diff --git a/k256/Cargo.toml b/k256/Cargo.toml
index 25b170fa..79ac6d7e 100644
--- a/k256/Cargo.toml
+++ b/k256/Cargo.toml
@@ -23,7 +23,7 @@ cfg-if = "1.0"
 elliptic-curve = { version = "0.14.0-rc.0", default-features = false, features = ["sec1"] }
 
 # optional dependencies
-once_cell = { version = "1.19", optional = true, default-features = false }
+once_cell = { version = "1.20", optional = true, default-features = false }
 ecdsa-core = { version = "=0.17.0-pre.9", package = "ecdsa", optional = true, default-features = false, features = ["der"] }
 hex-literal = { version = "0.4", optional = true }
 serdect = { version = "0.3.0-rc.0", optional = true, default-features = false }