diff --git a/Cargo.lock b/Cargo.lock
index 94f6ac691..ca6dff4a2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1379,7 +1379,7 @@ dependencies = [
 name = "sec1"
 version = "0.8.0-rc.8"
 dependencies = [
- "base16ct 0.2.0",
+ "base16ct 0.3.0",
  "der",
  "hex-literal",
  "hybrid-array",
diff --git a/sec1/Cargo.toml b/sec1/Cargo.toml
index 860be5c35..46ed19b70 100644
--- a/sec1/Cargo.toml
+++ b/sec1/Cargo.toml
@@ -17,7 +17,7 @@ edition = "2024"
 rust-version = "1.85"
 
 [dependencies]
-base16ct = { version = "0.2", optional = true, default-features = false }
+base16ct = { version = "0.3", optional = true, default-features = false }
 der = { version = "0.8.0-rc.8", optional = true, features = ["oid"] }
 hybrid-array = { version = "0.3", optional = true, default-features = false }
 serdect = { version = "0.4", optional = true, default-features = false, features = ["alloc"] }