diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index 810314b86..347e0550a 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.20.39",
+    "version": "2.20.40",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",
diff --git a/packages/hydrooj/src/handler/training.ts b/packages/hydrooj/src/handler/training.ts
index e7dec5a0e..231192fc5 100644
--- a/packages/hydrooj/src/handler/training.ts
+++ b/packages/hydrooj/src/handler/training.ts
@@ -157,6 +157,14 @@ class TrainingDetailHandler extends Handler {
         await training.enroll(domainId, tdoc.docId, this.user._id);
         this.back();
     }
+
+    @param('tid', Types.ObjectID)
+    async postDelete(domainId: string, tid: ObjectID) {
+        const tdoc = await training.get(domainId, tid);
+        if (tdoc.owner !== this.user._id) this.checkPerm(PERM.PERM_EDIT_TRAINING);
+        await training.del(domainId, tid);
+        this.response.redirect = this.url('training_main');
+    }
 }
 
 class TrainingCreateHandler extends Handler {