diff --git a/comments/views.py b/comments/views.py
index ac1cf04..b4cf4ca 100644
--- a/comments/views.py
+++ b/comments/views.py
@@ -1,6 +1,7 @@
 # Create your views here.
 from django.core.exceptions import ValidationError
 from django.http import HttpResponseRedirect
+from django.shortcuts import get_object_or_404
 from django.utils.decorators import method_decorator
 from django.views.decorators.csrf import csrf_protect
 from django.views.generic.edit import FormView
@@ -20,14 +21,13 @@ class CommentPostView(FormView):
 
     def get(self, request, *args, **kwargs):
         article_id = self.kwargs['article_id']
-
-        article = Article.objects.get(pk=article_id)
+        article = get_object_or_404(Article, pk=article_id)
         url = article.get_absolute_url()
         return HttpResponseRedirect(url + "#comments")
 
     def form_invalid(self, form):
         article_id = self.kwargs['article_id']
-        article = Article.objects.get(pk=article_id)
+        article = get_object_or_404(Article, pk=article_id)
 
         return self.render_to_response({
             'form': form,
@@ -39,7 +39,7 @@ class CommentPostView(FormView):
         user = self.request.user
 
         article_id = self.kwargs['article_id']
-        article = Article.objects.get(pk=article_id)
+        article = get_object_or_404(Article, pk=article_id)
 
         if article.comment_status == 'c' or article.status == 'c':
             raise ValidationError("该文章评论已关闭.")
diff --git a/requirements.txt b/requirements.txt
index ce971b8..d424b79 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-coverage==7.2.1
+coverage==7.2.2
 bleach==6.0.0
 Django==4.1.7
 django-compressor==4.3.1
@@ -11,16 +11,16 @@ elasticsearch-dsl==7.4.0
 gevent==22.10.2
 jieba==0.42.1
 jsonpickle==3.0.1
-Markdown==3.4.1
+Markdown==3.4.3
 mysqlclient==2.1.1
 Pillow==9.4.0
 Pygments==2.14.0
 python-logstash==0.4.8
 python-slugify==8.0.1
-pytz==2022.7.1
+pytz==2023.2
 raven==6.10.0
 requests==2.28.2
-urllib3==1.26.14
+urllib3==1.26.15
 WeRoBot==1.13.1
 Whoosh==2.7.4
 user-agents==2.2.0