diff --git a/packages/cli/src/CliSetup.ts b/packages/cli/src/CliSetup.ts
index cad6b8c..5b339f9 100644
--- a/packages/cli/src/CliSetup.ts
+++ b/packages/cli/src/CliSetup.ts
@@ -48,7 +48,7 @@ function resolveBuildToolsPath(buildToolsPath: string | undefined) {
 function latestReleaseMessage() {
   showMessage(
     `Publishing Tools Version ${ Constants.CLI_VERSION }`,
-    "- priority fee has been updated to handle network congestion\n- short_description value reduced to 30 character limit",
+    "- priority fee has been updated to 500000 lamports = 0.0005 SOL. To adjust this value use param `-p or --priority-fee-lamports`",
     "warning"
   );
 }
diff --git a/packages/core/src/CoreUtils.ts b/packages/core/src/CoreUtils.ts
index bd1ca81..97be821 100644
--- a/packages/core/src/CoreUtils.ts
+++ b/packages/core/src/CoreUtils.ts
@@ -31,6 +31,10 @@ export const mintNft = async (
   const { uri } = await metaplex.nfts().uploadMetadata(json);
   const computeBudget = 250000
 
+  if (priorityFeeLamports < 0) {
+    throw new Error("Priority fees cannot be negative")
+  }
+
   const txBuilder = await metaplex
     .nfts()
     .builders()