diff --git a/__crypto/simple_contract/Cargo.lock b/__crypto/simple_contract/Cargo.lock
index 2ae7e01..459414a 100644
--- a/__crypto/simple_contract/Cargo.lock
+++ b/__crypto/simple_contract/Cargo.lock
@@ -425,9 +425,9 @@ dependencies = [
 
 [[package]]
 name = "rust_util"
-version = "0.6.26"
+version = "0.6.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3cf5c22991d8fa9a12da6e745e9ea6180df21ed48a8e28431c64fa5a2985d5d9"
+checksum = "88b0a3d578045d048ee07322b565755f561fc0642498f5dc2a133a0ad19fddc4"
 dependencies = [
  "clap",
  "lazy_static",
diff --git a/__crypto/simple_contract/src/main.rs b/__crypto/simple_contract/src/main.rs
index c8db560..aa2c064 100644
--- a/__crypto/simple_contract/src/main.rs
+++ b/__crypto/simple_contract/src/main.rs
@@ -40,6 +40,5 @@ fn main() -> XResult<()> {
     c.add(Box::new(cmd_credit_query::CommandImpl));
     c.add(Box::new(cmd_credit_queryall::CommandImpl));
 
-    c.run()?;
-    Ok(())
+    c.run()
 }