diff --git a/app/Services/SlotService.php b/app/Services/SlotService.php
index cfb8bb9..0ce26d1 100644
--- a/app/Services/SlotService.php
+++ b/app/Services/SlotService.php
@@ -99,6 +99,8 @@ class SlotService
             $lockedHold->status = HoldStatus::Confirmed;
             $lockedHold->save();
 
+            $this->invalidateAvailabilityCache();
+
             return $lockedHold->load('slot');
         });
     }
@@ -121,6 +123,8 @@ class SlotService
            $lockedHold->status = HoldStatus::Cancelled;
            $lockedHold->save();
 
+            $this->invalidateAvailabilityCache();
+
            return $lockedHold->load('slot');
         });
     }
@@ -142,4 +146,9 @@ class SlotService
             ->where('idempotency_key', $idempotencyKey)
             ->first();
     }
+
+    private function invalidateAvailabilityCache(): void
+    {
+        Cache::forget(self::AVAILABILITY_CACHE_KEY);
+    }
 }