diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index b7cb743..771ec91 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -17,7 +17,7 @@ jobs:
 
     strategy:
       matrix:
-        rust-version: [1.72.1]
+        rust-version: [1.73.0]
 
     steps:
     - name: Checkout code
diff --git a/anychain-ripple/src/transaction.rs b/anychain-ripple/src/transaction.rs
index 56aaf1e..08592b6 100644
--- a/anychain-ripple/src/transaction.rs
+++ b/anychain-ripple/src/transaction.rs
@@ -489,30 +489,30 @@ impl PartialEq for SerializedType {
     }
 }
 
-impl PartialOrd for SerializedType {
-    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+impl Ord for SerializedType {
+    fn cmp(&self, other: &Self) -> Ordering {
         let typ0 = self.typ() as u32;
         let val0 = self.val();
         let typ1 = other.typ() as u32;
         let val1 = other.val();
 
         if typ0 < typ1 {
-            Some(Ordering::Less)
+            Ordering::Less
         } else if typ0 > typ1 {
-            Some(Ordering::Greater)
+            Ordering::Greater
         } else if val0 < val1 {
-            Some(Ordering::Less)
+            Ordering::Less
         } else if val0 > val1 {
-            Some(Ordering::Greater)
+            Ordering::Greater
         } else {
-            Some(Ordering::Equal)
+            Ordering::Equal
         }
     }
 }
 
-impl Ord for SerializedType {
-    fn cmp(&self, other: &Self) -> Ordering {
-        self.partial_cmp(other).unwrap()
+impl PartialOrd for SerializedType {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
     }
 }
 
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index ad0f092..30b679b 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,5 +1,5 @@
 [toolchain]
-channel = "1.72.1"
+channel = "1.73.0"
 components = ["clippy", "rustfmt"]
 targets = []
 profile = "minimal"