diff --git a/web/app/controllers/problem_solutions.php b/web/app/controllers/problem_solutions.php
index 7906e35..b7195ea 100644
--- a/web/app/controllers/problem_solutions.php
+++ b/web/app/controllers/problem_solutions.php
@@ -2,6 +2,7 @@
 requireLib('bootstrap5');
 requireLib('hljs');
 requireLib('mathjax');
+requireLib('pdf.js');
 requirePHPLib('form');
 requirePHPLib('judger');
 
diff --git a/web/app/controllers/subdomain/blog/blog.php b/web/app/controllers/subdomain/blog/blog.php
index 9399add..4212b4f 100644
--- a/web/app/controllers/subdomain/blog/blog.php
+++ b/web/app/controllers/subdomain/blog/blog.php
@@ -2,6 +2,7 @@
 requireLib('bootstrap5');
 requireLib('mathjax');
 requireLib('hljs');
+requireLib('pdf.js');
 requirePHPLib('form');
 
 Auth::check() || redirectToLogin();