diff --git a/ceremonies/src/migrations.rs b/ceremonies/src/migrations.rs
index 87d1e75e..befc2715 100644
--- a/ceremonies/src/migrations.rs
+++ b/ceremonies/src/migrations.rs
@@ -26,7 +26,7 @@ pub mod v1 {
 
 	impl<T: Config + frame_system::Config> OnRuntimeUpgrade for Migration<T> {
 		#[cfg(feature = "try-runtime")]
-		fn pre_upgrade() -> Result<Vec<u8>, &'static str> {
+		fn pre_upgrade() -> Result<Vec<u8>, sp_runtime::DispatchError> {
 			assert_eq!(StorageVersion::get::<Pallet<T>>(), 0, "can only upgrade from version 0");
 
 			let attestations = v0::AttestationRegistry::<T>::iter();
@@ -60,7 +60,7 @@ pub mod v1 {
 		}
 
 		#[cfg(feature = "try-runtime")]
-		fn post_upgrade(state: Vec<u8>) -> Result<(), &'static str> {
+		fn post_upgrade(state: Vec<u8>) -> Result<(), sp_runtime::DispatchError> {
 			assert_eq!(StorageVersion::get::<Pallet<T>>(), 1, "must upgrade");
 
 			let old_attestation_count: u32 =
diff --git a/communities/src/migrations.rs b/communities/src/migrations.rs
index d53ce5e3..439d369a 100644
--- a/communities/src/migrations.rs
+++ b/communities/src/migrations.rs
@@ -53,7 +53,7 @@ pub mod v1 {
 
 	impl<T: Config + frame_system::Config> OnRuntimeUpgrade for Migration<T> {
 		#[cfg(feature = "try-runtime")]
-		fn pre_upgrade() -> Result<Vec<u8>, &'static str> {
+		fn pre_upgrade() -> Result<Vec<u8>, sp_runtime::DispatchError> {
 			assert_eq!(StorageVersion::get::<Pallet<T>>(), 0, "can only upgrade from version 0");
 
 			let cid_count = v0::CommunityIdentifiers::<T>::get().len() as u32;
@@ -126,7 +126,7 @@ pub mod v1 {
 		}
 
 		#[cfg(feature = "try-runtime")]
-		fn post_upgrade(state: Vec<u8>) -> Result<(), &'static str> {
+		fn post_upgrade(state: Vec<u8>) -> Result<(), sp_runtime::DispatchError> {
 			assert_eq!(StorageVersion::get::<Pallet<T>>(), 1, "must upgrade");
 
 			let (