diff --git a/Cargo.toml b/Cargo.toml
index 745862d9..63431453 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -45,11 +45,11 @@ futures = { version = "0.3", default-features = false }
 hex = "0.4"
 # Newer version 0.13.3 breakes backward compatibility. Add this temporary fix until pocket-ic or ic-cdk crates are fixed.
 ic-cdk = "=0.13.2"
-ic-canister = { git = "https://github.com/bitfinity-network/canister-sdk", package = "ic-canister", tag = "v0.17.x" }
-ic-canister-client = { git = "https://github.com/bitfinity-network/canister-sdk", package = "ic-canister-client", tag = "v0.17.x" }
-ic-exports = { git = "https://github.com/bitfinity-network/canister-sdk", package = "ic-exports", tag = "v0.17.x" }
-ic-log = { git = "https://github.com/bitfinity-network/canister-sdk", package = "ic-log", tag = "v0.17.x" }
-ic-stable-structures = { git = "https://github.com/bitfinity-network/canister-sdk", package = "ic-stable-structures", tag = "v0.17.x" }
+ic-canister = { git = "https://github.com/bitfinity-network/canister-sdk", package = "ic-canister", tag = "v0.18.x" }
+ic-canister-client = { git = "https://github.com/bitfinity-network/canister-sdk", package = "ic-canister-client", tag = "v0.18.x" }
+ic-exports = { git = "https://github.com/bitfinity-network/canister-sdk", package = "ic-exports", tag = "v0.18.x" }
+ic-log = { git = "https://github.com/bitfinity-network/canister-sdk", package = "ic-log", tag = "v0.18.x" }
+ic-stable-structures = { git = "https://github.com/bitfinity-network/canister-sdk", package = "ic-stable-structures", tag = "v0.18.x" }
 itertools = "0.13"
 jsonrpc-core = "18.0"
 jsonrpsee = { version = "0.23", features = ["server", "macros"] }
diff --git a/src/minter-did/src/order.rs b/src/minter-did/src/order.rs
index 278eabd4..7aae2c3a 100644
--- a/src/minter-did/src/order.rs
+++ b/src/minter-did/src/order.rs
@@ -8,7 +8,7 @@ use eth_signer::sign_strategy::TransactionSigner;
 use ethers_core::utils::keccak256;
 use ic_stable_structures::{Bound, Storable};
 use serde::de::Visitor;
-use serde::Deserialize;
+use serde::{Deserialize, Serialize};
 
 use crate::error::{Error, Result};
 use crate::id256::Id256;
@@ -221,6 +221,15 @@ impl<'v> Visitor<'v> for SignedMintOrderVisitor {
     }
 }
 
+impl Serialize for SignedMintOrder {
+    fn serialize<S>(&self, serializer: S) -> std::prelude::v1::Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        serializer.serialize_bytes(&self.0)
+    }
+}
+
 impl<'de> Deserialize<'de> for SignedMintOrder {
     fn deserialize<D>(deserializer: D) -> std::result::Result<Self, D::Error>
     where