diff --git a/certora/specs/StakeManager.spec b/certora/specs/StakeManager.spec
index 3def074..3026793 100644
--- a/certora/specs/StakeManager.spec
+++ b/certora/specs/StakeManager.spec
@@ -129,10 +129,7 @@ rule revertsWhenNoMigration(method f) {
 //   assert before == staked.balanceOf(user);
 // }
 
-rule epochOnlyIncreases(method f) filtered {
-  f -> f.selector != sig:migrationInitialize(uint256,uint256,uint256,uint256).selector;
-} {
-  method f;
+rule epochOnlyIncreases(method f) {
   env e;
   calldataarg args;
 
diff --git a/contracts/StakeManager.sol b/contracts/StakeManager.sol
index 42d4abc..486194e 100644
--- a/contracts/StakeManager.sol
+++ b/contracts/StakeManager.sol
@@ -19,6 +19,7 @@ contract StakeManager is Ownable {
     error StakeManager__InvalidLockupPeriod();
     error StakeManager__AccountNotInitialized();
     error StakeManager__InvalidMigration();
+    error StakeManager__AlreadyProcessedEpochs();
 
     struct Account {
         address rewardAddress;
@@ -254,6 +255,9 @@ contract StakeManager is Ownable {
         if (address(migration) != address(0)) {
             revert StakeManager__PendingMigration();
         }
+        if (currentEpoch > 0) {
+            revert StakeManager__AlreadyProcessedEpochs();
+        }
         currentEpoch = _currentEpoch;
         totalSupplyMP = _totalSupplyMP;
         totalSupplyBalance = _totalSupplyBalance;