diff --git a/blog/views.py b/blog/views.py
index 6cc05cd..0e6f962 100644
--- a/blog/views.py
+++ b/blog/views.py
@@ -123,7 +123,16 @@ class ArticleDetailView(DetailView):
         parent_comments = article_comments.filter(parent_comment=None)
         blog_setting = get_blog_setting()
         paginator = Paginator(parent_comments, blog_setting.article_comment_count)
-        page = self.request.GET.get('comment_page', 1)
+        page = self.request.GET.get('comment_page', '1')
+        if not page.isnumeric():
+            page = 1
+        else:
+            page = int(page)
+            if page < 1:
+                page = 1
+            if page > paginator.num_pages:
+                page = paginator.num_pages
+
         p_comments = paginator.page(page)
         next_page = p_comments.next_page_number() if p_comments.has_next() else None
         prev_page = p_comments.previous_page_number() if p_comments.has_previous() else None
diff --git a/djangoblog/utils.py b/djangoblog/utils.py
index 038548a..e68ea12 100644
--- a/djangoblog/utils.py
+++ b/djangoblog/utils.py
@@ -49,7 +49,7 @@ def cache_decorator(expiration=3 * 60):
                 else:
                     return value
             else:
-                logger.info(
+                logger.debug(
                     'cache_decorator set cache:%s key:%s' %
                     (func.__name__, key))
                 value = func(*args, **kwargs)
diff --git a/requirements.txt b/requirements.txt
index d6ce3d1..a9d65db 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
-coverage==6.4.4
+coverage==6.5.0
 bleach==5.0.1
-Django==4.1.1
+Django==4.1.2
 django-compressor==4.1
 django-haystack==3.2.1
 django-ipware==4.0.2
@@ -17,7 +17,7 @@ Pillow==9.2.0
 Pygments==2.13.0
 python-logstash==0.4.8
 python-slugify==6.1.2
-pytz==2022.2.1
+pytz==2022.4
 raven==6.10.0
 requests==2.28.1
 urllib3==1.26.12