diff --git a/src/api.rs b/src/api.rs
index bf7cc7b..06713bc 100644
--- a/src/api.rs
+++ b/src/api.rs
@@ -1279,9 +1279,8 @@ pub fn update_process(
     for (field, plain_value) in new_attributes.iter() {
         let hash = new_state.pcd_commitment.get(field).ok_or(anyhow::Error::msg("Missing commitment"))?;
         let key = generate_key(&mut rng);
+        let cipher = encrypt_with_key(&key, plain_value.as_slice())?;
         new_state.keys.insert(field.to_owned(), key);
-        let serialized = serde_json::to_string(plain_value)?;
-        let cipher = encrypt_with_key(&key, serialized.as_bytes())?;
         encrypted_data.insert(hash.to_lower_hex_string(), cipher.to_lower_hex_string());
     }