diff --git a/contracts/TimeManagerV5.sol b/contracts/TimeManagerV5.sol
index 033cc88..59ba7c3 100644
--- a/contracts/TimeManagerV5.sol
+++ b/contracts/TimeManagerV5.sol
@@ -11,6 +11,13 @@ contract TimeManagerV5 {
     /// @dev Sets true when block timestamp is used
     bool public isTimeBased;
 
+    /**
+     * @dev This empty reserved space is put in place to allow future versions to add new
+     * variables without shifting down storage in the inheritance chain
+     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
+     */
+    uint256[47] private __gap;
+
     /**
      * @dev Retrieves the current slot
      * @return Current slot
diff --git a/contracts/TimeManagerV8.sol b/contracts/TimeManagerV8.sol
index eaee7c4..e36f339 100644
--- a/contracts/TimeManagerV8.sol
+++ b/contracts/TimeManagerV8.sol
@@ -10,6 +10,13 @@ abstract contract TimeManagerV8 {
     /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
     bool public immutable isTimeBased;
 
+    /**
+     * @dev This empty reserved space is put in place to allow future versions to add new
+     * variables without shifting down storage in the inheritance chain
+     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
+     */
+    uint256[48] private __gap;
+
     /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
     function() view returns (uint256) private immutable _getCurrentSlot;