diff --git a/ci_scripts/lint-ubuntu.sh b/ci_scripts/lint-ubuntu.sh
old mode 100644
new mode 100755
diff --git a/nssa/src/public_transaction/message.rs b/nssa/src/public_transaction/message.rs
index 784777d..68cb5fb 100644
--- a/nssa/src/public_transaction/message.rs
+++ b/nssa/src/public_transaction/message.rs
@@ -2,11 +2,11 @@ use nssa_core::{
     account::Nonce,
     program::{InstructionData, ProgramId},
 };
-use serde::{Deserialize, Serialize};
+use serde::Serialize;
 
 use crate::{Address, error::NssaError, program::Program};
 
-#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 pub struct Message {
     pub(crate) program_id: ProgramId,
     pub(crate) addresses: Vec<Address>,
diff --git a/nssa/src/signature/public_key.rs b/nssa/src/signature/public_key.rs
index 6e0035f..ac163d8 100644
--- a/nssa/src/signature/public_key.rs
+++ b/nssa/src/signature/public_key.rs
@@ -15,7 +15,7 @@ impl PublicKey {
         Self(value)
     }
 
-    pub fn try_new(value: [u8; 32]) -> Result<Self, NssaError> {
+    pub(super) fn try_new(value: [u8; 32]) -> Result<Self, NssaError> {
         // Check point is valid
         let _ = secp256k1::XOnlyPublicKey::from_byte_array(value)
             .map_err(|_| NssaError::InvalidPublicKey)?;