diff --git a/Cargo.lock b/Cargo.lock
index ab16516..81279a2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "as-slice"
 version = "0.1.5"
@@ -236,9 +238,9 @@ dependencies = [
 
 [[package]]
 name = "darling"
-version = "0.12.2"
+version = "0.13.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a06d4a9551359071d1890820e3571252b91229e0712e7c36b08940e603c5a8fc"
+checksum = "dbcc37e3091b4dfd0af76cb0087b9c89b8e03072abc28ae2efc8fdd733bfc5f5"
 dependencies = [
  "darling_core",
  "darling_macro",
@@ -246,9 +248,9 @@ dependencies = [
 
 [[package]]
 name = "darling_core"
-version = "0.12.2"
+version = "0.13.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b443e5fb0ddd56e0c9bfa47dc060c5306ee500cb731f2b91432dd65589a77684"
+checksum = "9569a966dba8cd57879b8efd2bf82b5c56bb466e19767a69c560bddee1a27f5c"
 dependencies = [
  "fnv",
  "ident_case",
@@ -260,9 +262,9 @@ dependencies = [
 
 [[package]]
 name = "darling_macro"
-version = "0.12.2"
+version = "0.13.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c0220073ce504f12a70efc4e7cdaea9e9b1b324872e7ad96a208056d7a638b81"
+checksum = "efae147148c6380157050146a2040b65dbe91bef6e97aaaa39ef0d469d2eb4af"
 dependencies = [
  "darling_core",
  "quote",
diff --git a/rust/derive/Cargo.toml b/rust/derive/Cargo.toml
index c588964..39af6e2 100644
--- a/rust/derive/Cargo.toml
+++ b/rust/derive/Cargo.toml
@@ -14,7 +14,7 @@ keywords    = ["hashing", "merkle", "protobufs", "security", "serialization"]
 proc-macro = true
 
 [dependencies]
-darling = "0.12"
+darling = "0.13"
 proc-macro2 = "1"
 quote = "1"
 syn = "1"