diff --git a/source/conf.py b/source/conf.py
index 0a7de597..7a0f888d 100755
--- a/source/conf.py
+++ b/source/conf.py
@@ -146,7 +146,7 @@
 
 # Additional stuff for the LaTeX preamble.
 'preamble': '''
-\\usepackage{xeCJK}
+\\usepackage{ctex}
 \\setcounter{tocdepth}{2}
 \\addto\\captionsenglish{%
   \\renewcommand{\\chaptername}{章节}%