diff --git a/contracts/core b/contracts/core
index dc8104e4..20333a08 160000
--- a/contracts/core
+++ b/contracts/core
@@ -1 +1 @@
-Subproject commit dc8104e4ec287e31df33695e33be22b6cbaadfdb
+Subproject commit 20333a08e726ace3a66bf0227daf003c60be8316
diff --git a/packages/vectis-tests/src/test_tube/plugin_registry_mgmt/add_subscription_tiers.rs b/packages/vectis-tests/src/test_tube/plugin_registry_mgmt/add_subscription_tiers.rs
index 1e7eb68a..89edbadd 100644
--- a/packages/vectis-tests/src/test_tube/plugin_registry_mgmt/add_subscription_tiers.rs
+++ b/packages/vectis-tests/src/test_tube/plugin_registry_mgmt/add_subscription_tiers.rs
@@ -30,7 +30,7 @@ fn deployer_can_add_subscription_tier() {
         &app,
         suite.deployer.clone(),
         suite.plugin_registry.clone(),
-        &registry_management_trait::ExecMsg::AddSubscriptionTiers {
+        &registry_management_trait::ExecMsg::AddOrUpdateSubscriptionTiers {
             tier: SubscriptionTier::Other as u8,
             details: TierDetails {
                 max_plugins: 3,
@@ -65,7 +65,7 @@ fn existing_tier_cannot_be_added() {
         &app,
         suite.deployer.clone(),
         suite.plugin_registry.clone(),
-        &registry_management_trait::ExecMsg::AddSubscriptionTiers {
+        &registry_management_trait::ExecMsg::AddOrUpdateSubscriptionTiers {
             tier: current_tier,
             details: TierDetails {
                 max_plugins: 3,
@@ -88,7 +88,7 @@ fn not_deployer_cannot_add_subscription_tier() {
     // Sent from another signer
     registry
         .execute(
-            &registry_management_trait::ExecMsg::AddSubscriptionTiers {
+            &registry_management_trait::ExecMsg::AddOrUpdateSubscriptionTiers {
                 tier: SubscriptionTier::L1 as u8,
                 details: TierDetails {
                     max_plugins: 3,
diff --git a/packages/vectis-tests/src/unit_tests/registry_mgmt.rs b/packages/vectis-tests/src/unit_tests/registry_mgmt.rs
index 29d8144b..37f7b05f 100644
--- a/packages/vectis-tests/src/unit_tests/registry_mgmt.rs
+++ b/packages/vectis-tests/src/unit_tests/registry_mgmt.rs
@@ -142,3 +142,36 @@ fn new_plugin_version_with_same_code_id_fails() {
 
     assert_eq!(err, PluginRegError::CodeIdAlreadyRegistered)
 }
+
+#[test]
+fn can_update_subscription_tier() {
+    let suite = VectisTestSuite::new();
+    let registry = VectisPluginRegistryProxy::new(suite.plugin_registry, &suite.app);
+    let existing_tier = registry
+        .registry_management_trait_proxy()
+        .get_config()
+        .unwrap()
+        .subscription_tiers
+        .pop()
+        .unwrap();
+
+    let mut new_tier_details = existing_tier.1.clone();
+    new_tier_details.fee = coin(REGISTRY_FEE, DENOM);
+
+    registry
+        .registry_management_trait_proxy()
+        .add_or_update_subscription_tiers(existing_tier.0, new_tier_details)
+        .call(suite.deployer.as_str())
+        .unwrap();
+
+    let new_tier = registry
+        .registry_management_trait_proxy()
+        .get_config()
+        .unwrap()
+        .subscription_tiers
+        .pop()
+        .unwrap();
+
+    assert_eq!(existing_tier.0, new_tier.0);
+    assert_ne!(existing_tier.1, new_tier.1)
+}
diff --git a/packages/vectis/src/interface/plugin_registry.rs b/packages/vectis/src/interface/plugin_registry.rs
index 27157b3b..cec9ab2b 100644
--- a/packages/vectis/src/interface/plugin_registry.rs
+++ b/packages/vectis/src/interface/plugin_registry.rs
@@ -89,7 +89,7 @@ pub mod registry_management_trait {
         /// To remove tier there may already be subscribers and so it will require a migration
         /// function
         #[msg(exec)]
-        fn add_subscription_tiers(
+        fn add_or_update_subscription_tiers(
             &self,
             ctx: ExecCtx,
             tier: u8,