diff --git a/Dockerfile b/Dockerfile
index 2622ea1..d387ffa 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,8 +9,7 @@ RUN bundle config --global frozen 1
 ENV LANG C.UTF-8
 
 WORKDIR /usr/src/app
-COPY Gemfile /usr/src/app/
-COPY Gemfile.lock /usr/src/app/
+COPY Gemfile Gemfile.lock /usr/src/app/
 RUN bundle install
 
-COPY . /usr/src/app
\ No newline at end of file
+COPY . /usr/src/app
diff --git a/Gemfile b/Gemfile
index f700162..d6fa557 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,3 @@
 source 'https://rubygems.org'
 
 gem 'github-pages', group: :jekyll_plugins # workaround https://github.com/github/pages-gem#usage
-gem 'jekyll-redirect-from'
\ No newline at end of file
diff --git a/Gemfile.lock b/Gemfile.lock
index d7cedd0..3c1b1f9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -81,7 +81,7 @@ GEM
       octokit (~> 4.0)
       public_suffix (~> 2.0)
       typhoeus (~> 1.3)
-    html-pipeline (2.8.3)
+    html-pipeline (2.8.4)
       activesupport (>= 2)
       nokogiri (>= 1.4)
     http_parser.rb (0.6.0)
diff --git a/_config.yml b/_config.yml
index c3da5b3..640ad3c 100644
--- a/_config.yml
+++ b/_config.yml
@@ -23,7 +23,11 @@ twitter:
 github:
   username: uetchy
 logo: "/images/icon.png"
-highlighter: 
+highlighter: none
+markdown: kramdown
+kramdown:
+  syntax_highlighter_opts:
+    disable : true
 excerpt_separator: "#"
 google_analytics: UA-28919359-12
 plugins:
@@ -32,7 +36,6 @@ plugins:
 - jekyll-seo-tag
 - jekyll-feed
 - jemoji
-- jekyll-redirect-from
 include:
 - _pages
 exclude:
diff --git a/_includes/head.html b/_includes/head.html
index 29f8ed3..cbe65f0 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -30,4 +30,17 @@
 
   <!-- Styles -->
   <link rel="stylesheet" href="{{ site.baseurl }}/css/index.css">
-</head>
\ No newline at end of file
+
+  <!-- MathJax -->
+  <script type="text/x-mathjax-config">
+    MathJax.Hub.Config({
+      tex2jax: {
+        inlineMath: [ ['$','$'], ["\\(","\\)"] ],
+        processEscapes: true
+      }
+    });
+  </script>
+  <script src='https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js?config=TeX-MML-AM_CHTML' async></script>
+  </script>
+
+</head>
diff --git a/_layouts/post.html b/_layouts/post.html
index a58714a..52e1d49 100644
--- a/_layouts/post.html
+++ b/_layouts/post.html
@@ -22,18 +22,3 @@ layout: default
     </div>
   </article>
 </section>
-
-<!-- MathJax -->
-<script type="text/x-mathjax-config">
-  MathJax.Hub.Config({
-    tex2jax: {
-    inlineMath: [['$','$'], ['\\(','\\)']],
-    displayMath: [['$$','$$'], ['\[','\]']],
-    processEscapes: false,
-    processEnvironments: false,
-    skipTags: ['script', 'noscript', 'style', 'textarea', 'pre', 'a']
-  }
-});
-</script>
-<script type="text/javascript" async src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.2/MathJax.js?config=TeX-AMS_SVG">
-</script>
\ No newline at end of file
diff --git a/_posts/2018-08-03-hermitian-conjugate.md b/_posts/2018-08-03-hermitian-conjugate.md
index 47b9e0b..d3f5530 100644
--- a/_posts/2018-08-03-hermitian-conjugate.md
+++ b/_posts/2018-08-03-hermitian-conjugate.md
@@ -8,8 +8,8 @@ $m\times n$の複素行列の転置を取り、複素共軛をとった$n\times
 $$
 \begin{align}
 A &=\begin{pmatrix} 1 & -1-i \\ 1+i & i \end{pmatrix} \\
-A^_ &=\begin{pmatrix} 1 & 1-i \\ -1+i & -i \end{pmatrix} \\
-A^_ &= \bar{A}^T
+A^{\_} &=\begin{pmatrix} 1 & 1-i \\ -1+i & -i \end{pmatrix} \\
+A^{\_} &= \bar{A}^T
 \end{align}
 $$