diff --git a/package-lock.json b/package-lock.json
index f5462d2..487c7dc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -47,7 +47,7 @@
         "rollup": "4.18.0",
         "rollup-plugin-serve": "2.0.2",
         "ts-jest": "29.1.5",
-        "typescript": "5.4.5"
+        "typescript": "5.5.4"
       }
     },
     "node_modules/@aashutoshrathi/word-wrap": {
@@ -10756,9 +10756,9 @@
       }
     },
     "node_modules/typescript": {
-      "version": "5.4.5",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.5.tgz",
-      "integrity": "sha512-vcI4UpRgg81oIRUFwR0WSIHKt11nJ7SAVlYNIu+QpqeyXP+gpQJy/Z4+F0aGxSE4MqwjyXvW/TzgkLAx2AGHwQ==",
+      "version": "5.5.4",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.5.4.tgz",
+      "integrity": "sha512-Mtq29sKDAEYP7aljRgtPOpTvOfbwRWlS6dPRzwjdE+C0R4brX/GUyhHSecbHMFLNBLcJIPt9nl9yG5TZ1weH+Q==",
       "dev": true,
       "bin": {
         "tsc": "bin/tsc",
diff --git a/package.json b/package.json
index d97a99c..7085b42 100644
--- a/package.json
+++ b/package.json
@@ -74,6 +74,6 @@
     "rollup": "4.18.0",
     "rollup-plugin-serve": "2.0.2",
     "ts-jest": "29.1.5",
-    "typescript": "5.4.5"
+    "typescript": "5.5.4"
   }
 }
diff --git a/src/utils/findActiveEvents.ts b/src/utils/findActiveEvents.ts
index 9766060..8efb163 100644
--- a/src/utils/findActiveEvents.ts
+++ b/src/utils/findActiveEvents.ts
@@ -25,7 +25,7 @@ const isMatchingAnyPatterns = (item: CalendarEvent, config: Config) => {
   const trashTypes = config.pattern.filter(pat => pat.type !== 'others');
   const patterns = trashTypes.map(pat => pat.pattern).filter(pattern => pattern !== undefined);
 
-  return patterns.length === 0 || patterns.some(pattern => item.content.summary.toLowerCase().includes(pattern!.toLowerCase()));
+  return patterns.length === 0 || patterns.some(pattern => item.content.summary.toLowerCase().includes(pattern.toLowerCase()));
 };
 
 const isNotPastWholeDayEvent = (item: CalendarEvent, now: Date, dropAfter: boolean): boolean =>