diff --git a/gn-runtime/src/lib.rs b/gn-runtime/src/lib.rs
index 699f3786..f18b2306 100644
--- a/gn-runtime/src/lib.rs
+++ b/gn-runtime/src/lib.rs
@@ -79,6 +79,15 @@ pub mod opaque {
     /// Opaque block identifier type.
     pub type BlockId = generic::BlockId<Block>;
 
+    // TODO Remove after im_online runtime upgrade is done.
+    impl_opaque_keys! {
+        pub struct OldSessionKeys {
+            pub aura: Aura,
+            pub grandpa: Grandpa,
+
+        }
+    }
+
     impl_opaque_keys! {
         pub struct SessionKeys {
             pub aura: Aura,
@@ -100,7 +109,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
     //   `spec_version`, and `authoring_version` are the same between Wasm and native.
     // This value is set to 100 to notify Polkadot-JS App (https://polkadot.js.org/apps) to use
     //   the compatible custom types.
-    spec_version: 103,
+    spec_version: 102,
     impl_version: 1,
     apis: RUNTIME_API_VERSIONS,
     transaction_version: 1,
@@ -277,7 +286,7 @@ impl pallet_im_online::Config for Runtime {
     type RuntimeEvent = RuntimeEvent;
     type NextSessionRotation = pallet_session::PeriodicSessions<Period, Offset>;
     type ValidatorSet = ValidatorManager;
-    type ReportUnresponsiveness = ValidatorManager;
+    type ReportUnresponsiveness = ();
     type UnsignedPriority = ImOnlineUnsignedPriority;
     type WeightInfo = pallet_im_online::weights::SubstrateWeight<Runtime>;
     type MaxKeys = MaxKeys;
@@ -381,6 +390,26 @@ impl pallet_validator_manager::Config for Runtime {
     type MinAuthorities = MinAuthorities;
 }
 
+// should be removed along with UpgradeSessionKeys
+fn transform_session_keys(_v: AccountId, old: opaque::OldSessionKeys) -> opaque::SessionKeys {
+    let dummy_id = pallet_im_online::sr25519::AuthorityId::try_from(old.aura.as_ref()).unwrap();
+
+    opaque::SessionKeys {
+        grandpa: old.grandpa,
+        aura: old.aura,
+        im_online: dummy_id,
+    }
+}
+
+// When this is removed, should also remove `OldSessionKeys`.
+pub struct UpgradeSessionKeys;
+impl frame_support::traits::OnRuntimeUpgrade for UpgradeSessionKeys {
+    fn on_runtime_upgrade() -> frame_support::weights::Weight {
+        Session::upgrade_keys::<opaque::OldSessionKeys, _>(transform_session_keys);
+        BlockWeights::get().max_block
+    }
+}
+
 // Create the runtime by composing the FRAME pallets that were previously configured.
 construct_runtime!(
     pub enum Runtime where
@@ -437,6 +466,7 @@ pub type Executive = frame_executive::Executive<
     frame_system::ChainContext<Runtime>,
     Runtime,
     AllPalletsWithSystem,
+    UpgradeSessionKeys,
 >;
 
 #[cfg(feature = "runtime-benchmarks")]