diff --git a/Makefile b/Makefile
index c28cf6a..9471e94 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@
 
 TITLE = pkuthss
 EXAMPLE = thesis
-VERSION = 1.8.3
+VERSION = 1.9.0
 
 default: dist
 
diff --git a/doc/example/chap/abs.tex b/doc/example/chap/abs.tex
index dcffe0e..ea215a8 100644
--- a/doc/example/chap/abs.tex
+++ b/doc/example/chap/abs.tex
@@ -1,4 +1,4 @@
-% Copyright (c) 2014,2016 Casper Ti. Vector
+% Copyright (c) 2014,2016,2021 Casper Ti. Vector
 % Public domain.
 
 \begin{cabstract}
diff --git a/doc/readme/ChangeLog.txt b/doc/readme/ChangeLog.txt
index aaf026b..1d7835c 100644
--- a/doc/readme/ChangeLog.txt
+++ b/doc/readme/ChangeLog.txt
@@ -1,3 +1,19 @@
+2010-03-29, v1.9.0
+
+	* API changes:
+	- Add support for double-blind review (thank @Kurapikov).
+	- Add `\thesiscover' for possibly different thesis name on the cover.
+
+	* Changes to package code:
+	- Greatly improve format compliance (thank @Kurapikov).
+
+	* Changes to documentation:
+	- More notes about table font and GB/T 7714.
+	- Avoid undefined `\textepsilon'.
+
+	* Misc:
+	- Minor fixes and cosmetics.
+
 2020-11-02, v1.8.3
 
 	* Changes to example template:
diff --git a/doc/readme/chap/pkuthss-abs.tex b/doc/readme/chap/pkuthss-abs.tex
index 98da3d9..06d2032 100644
--- a/doc/readme/chap/pkuthss-abs.tex
+++ b/doc/readme/chap/pkuthss-abs.tex
@@ -1,7 +1,7 @@
 % Documentation for pkuthss.
 %
 % Copyright (c) 2008-2009 solvethis
-% Copyright (c) 2010-2014 Casper Ti. Vector
+% Copyright (c) 2010-2014,2021 Casper Ti. Vector
 %
 % This work may be distributed and/or modified under the conditions of the
 % LaTeX Project Public License, either version 1.3 of this license or (at
diff --git a/doc/readme/chap/pkuthss-ack.tex b/doc/readme/chap/pkuthss-ack.tex
index d189037..cd2deb2 100644
--- a/doc/readme/chap/pkuthss-ack.tex
+++ b/doc/readme/chap/pkuthss-ack.tex
@@ -1,7 +1,7 @@
 % Documentation for pkuthss.
 %
 % Copyright (c) 2008-2009 solvethis
-% Copyright (c) 2010-2012,2015 Casper Ti. Vector
+% Copyright (c) 2010-2012,2015,2021 Casper Ti. Vector
 %
 % This work may be distributed and/or modified under the conditions of the
 % LaTeX Project Public License, either version 1.3 of this license or (at
diff --git a/doc/readme/pkuthss.tex b/doc/readme/pkuthss.tex
index 50d140d..8305720 100644
--- a/doc/readme/pkuthss.tex
+++ b/doc/readme/pkuthss.tex
@@ -51,7 +51,7 @@
 }
 
 \newif\ifblind\blindfalse
-\newcommand*{\docversion}{v1.8.3}
+\newcommand*{\docversion}{v1.9.0}
 \pkuthssinfo{
 	cthesisname = {本科生毕业论文}, ethesisname = {Undergraduate Thesis},
 	ctitle = {北京大学学位论文模版{\thssnl}pkuthss \docversion},
@@ -60,7 +60,7 @@
 		\texorpdfstring{\thssnl}{: }pkuthss \docversion%
 	},
 	cauthor = {盖茨波·钛·维克托}, eauthor = {Casper Ti.\ Vector},
-	date = {\zhdigits{2020}年\zhnumber{11}月},
+	date = {\zhdigits{2021}年\zhnumber{3}月},
 	studentid = {00910???}, school = {化学与分子工程学院},
 	cmajor = {应用化学}, emajor = {Applied Chemistry},
 	direction = {据说 Casper 自己也不知道},
diff --git a/tex/pkuthss-gbk.def b/tex/pkuthss-gbk.def
index 3542981..28eb1ad 100644
--- a/tex/pkuthss-gbk.def
+++ b/tex/pkuthss-gbk.def
@@ -23,7 +23,7 @@
 %   pkuword.eps
 
 \ProvidesFile{pkuthss-gbk.def}
-	[2020/11/02 v1.8.3 Labels and captions in GBK encoding
+	[2021/03/29 v1.9.0 Labels and captions in GBK encoding
 		for the pkuthss document class]
 
 \def\label@ctitle{��Ŀ��}
diff --git a/tex/pkuthss-utf8.def b/tex/pkuthss-utf8.def
index d968f90..6ab9dc0 100644
--- a/tex/pkuthss-utf8.def
+++ b/tex/pkuthss-utf8.def
@@ -23,7 +23,7 @@
 %   pkuword.eps
 
 \ProvidesFile{pkuthss-utf8.def}
-	[2020/11/02 v1.8.3 Labels and captions in UTF-8 encoding
+	[2021/03/29 v1.9.0 Labels and captions in UTF-8 encoding
 		for the pkuthss document class]
 
 \def\label@ctitle{题目：}
diff --git a/tex/pkuthss.cls b/tex/pkuthss.cls
index 4499528..2abf2d7 100644
--- a/tex/pkuthss.cls
+++ b/tex/pkuthss.cls
@@ -24,7 +24,7 @@
 
 \NeedsTeXFormat{LaTeX2e}[1995/12/01]
 \ProvidesClass{pkuthss}
-	[2020/11/02 v1.8.3 Peking University dissertation document class]
+	[2021/03/29 v1.9.0 Peking University dissertation document class]
 
 % eg. `\thss@int@boolopt{spacing}{true}' will expand to:
 %   \newif\ifthss@opt@spacing \thss@opt@spacingtrue