diff --git a/engine/mk-index.sh b/engine/mk-index.sh
index 0d3e525..ef786b5 100755
--- a/engine/mk-index.sh
+++ b/engine/mk-index.sh
@@ -37,7 +37,7 @@ for fic in $(ls $tmpdir/*.index | sort -r); do
 done
 echo "</ul>" >> $tmpdir/index
 
-title="Y"
+title="Home"
 description="Most recent articles"
 author="Yann Esposito"
 body=$(< $tmpdir/index)
diff --git a/nix/sources.json b/nix/sources.json
index 3d1f87d..b303c7a 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -5,10 +5,10 @@
         "homepage": "https://haskell.org/ghc/",
         "owner": "alpmestan",
         "repo": "ghc.nix",
-        "rev": "9adaf8abe53fa0618c1561919ddfbc4342fe144b",
-        "sha256": "0qmkkildzl21y88czgnschvi8mdkqrj9hgvpban58zzjnxw5s4nd",
+        "rev": "c342555294d3cca888204f69739990871ceb4e22",
+        "sha256": "00aw7a5lpmhvk00mlf8chd63xhpilv00g7qik2lxxbc9xh4w1iz2",
         "type": "tarball",
-        "url": "https://github.com/alpmestan/ghc.nix/archive/9adaf8abe53fa0618c1561919ddfbc4342fe144b.tar.gz",
+        "url": "https://github.com/alpmestan/ghc.nix/archive/c342555294d3cca888204f69739990871ceb4e22.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "niv": {
@@ -17,22 +17,22 @@
         "homepage": "https://github.com/nmattia/niv",
         "owner": "nmattia",
         "repo": "niv",
-        "rev": "f73bf8d584148677b01859677a63191c31911eae",
-        "sha256": "0jlmrx633jvqrqlyhlzpvdrnim128gc81q5psz2lpp2af8p8q9qs",
+        "rev": "82e5cd1ad3c387863f0545d7591512e76ab0fc41",
+        "sha256": "090l219mzc0gi33i3psgph6s2pwsc8qy4lyrqjdj4qzkvmaj65a7",
         "type": "tarball",
-        "url": "https://github.com/nmattia/niv/archive/f73bf8d584148677b01859677a63191c31911eae.tar.gz",
+        "url": "https://github.com/nmattia/niv/archive/82e5cd1ad3c387863f0545d7591512e76ab0fc41.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs": {
-        "branch": "nixpkgs-20.09-darwin",
+        "branch": "nixpkgs-22.05-darwin",
         "description": "A read-only mirror of NixOS/nixpkgs tracking the released channels. Send issues and PRs to",
         "homepage": "https://github.com/NixOS/nixpkgs",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "e716ddfac4be879ffbae75c3914a538dd5d4d12e",
-        "sha256": "0c2090sz4nvd1bqa9bfz3b6mj0q8b7v4jzgsykn2hf291l3h94d6",
+        "rev": "058d97782ed561787a6b2186854d29c94fd4fc0c",
+        "sha256": "04fzgchx6r1sjj5kgydnhlmdd4l8gbpy1q080cr1vnd3as5cz61q",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/e716ddfac4be879ffbae75c3914a538dd5d4d12e.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/058d97782ed561787a6b2186854d29c94fd4fc0c.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "shake": {
@@ -41,10 +41,10 @@
         "homepage": "http://shakebuild.com",
         "owner": "ndmitchell",
         "repo": "shake",
-        "rev": "4536d9ce5cef0e56395fd61ccef9816c9b420fd1",
-        "sha256": "1s7hjhcc09l026jaca3ndbb103s9d7qlx4vqzx2s6j4rr751nd70",
+        "rev": "31c72fe6ddfbf94dca1e64f5d73289d6926d902b",
+        "sha256": "06gvg20x2rq3cwvl8pj450ji446flbplxg34bwrkdycs4m5i7pv3",
         "type": "tarball",
-        "url": "https://github.com/ndmitchell/shake/archive/4536d9ce5cef0e56395fd61ccef9816c9b420fd1.tar.gz",
+        "url": "https://github.com/ndmitchell/shake/archive/31c72fe6ddfbf94dca1e64f5d73289d6926d902b.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }
diff --git a/src/css/y.css b/src/css/y.css
index 1a8fc6e..0c88ed2 100644
--- a/src/css/y.css
+++ b/src/css/y.css
@@ -74,7 +74,7 @@ figcaption { text-align: right; font-style: italic; font-size: 0.875em; }
 #toc { font-size: 0.875em; }
 #toc ul { padding-left: 2rem; }
 #toc, blockquote, pre.example, .line-block { margin: 0 1rem; padding: 0 1rem; border-left: solid var(--gr); }
-.pubDate { display: inline-block; width: 7em; font-size: .825em; opacity: 0.4; }
+.pubDate { display: inline-block; width: 7em; font-size: .825em; opacity: 0.7; }
 
 /* Fonts; https://systemfontstack.com */
 .sans { font-family: -apple-system, BlinkMacSystemFont, avenir next, avenir, segoe ui, helvetica neue, helvetica, Cantarell, Ubuntu, roboto, noto, arial, sans-serif; }
diff --git a/templates/index.html b/templates/index.html
index 7ffe868..897457c 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -16,8 +16,9 @@
   </head>
   <body>
     <div class="main">
+      <header role="banner" id="preamble">
         <div id="logo">
-          <a href="/">
+          <a href="/" title="logo; back to root page">
             <svg width="5em" viewBox="0 0 64 64">
               <circle cx="32" cy="32" r="30" stroke="#a3aec2" stroke-width="1" fill="#2E3440"></circle>
               <circle cx="32" cy="32" r="12" stroke="#800" stroke-width="1" fill="#c20"></circle>
@@ -26,8 +27,8 @@
             </svg>
           </a>
         </div>
-
-          <nav>
+        <h1>$title</h1>
+          <nav role="top-navigation">
             <a href="/index.html">Home</a> |
             <a href="/slides.html">Slides</a> |
             <a href="/about-me.html">About</a>
@@ -35,8 +36,8 @@
               <a href="https://espial.esy.fun/u:yogsototh">bookmarks</a>
               <a href="https://espial.esy.fun/u:yogsototh/notes">notes</a>)</span>
           </nav>
-      <div id="content">
-$if(toc)$<div id="toc">$table-of-contents$</div>$endif$
+      </header>
+      <main id="content" role="main">
 $body$
 
 <h3>Archives from my previous dead blog</h3>
@@ -121,10 +122,10 @@ $body$
   <li><span class="pubDate">2008-10-10</span> <span class="post-title"><a href="/Scratch/en/blog/01_nanoc/">Nanoc</a></span></li>
 </ul>
 
-      </div>
-      <div id="postamble" class="status">
+      </main>
+      <footer id="postamble" class="status" role="contentinfo">
         <div class="content">
-          <nav>
+          <nav role="bottom-navigation">
             <a href="/index.html">Home</a> |
             <a href="/slides.html">Slides</a> |
             <a href="/about-me.html">About</a>
@@ -134,7 +135,7 @@ $body$
             <a href="#logo">↑ Top ↑</a>
           </nav>
         </div>
-      </div>
+      </footer>
     </div>
   </body>
 </html>
diff --git a/templates/post.html b/templates/post.html
index c9dcbce..900f864 100644
--- a/templates/post.html
+++ b/templates/post.html
@@ -19,7 +19,7 @@
   <body>
     <div class="main">
         <div id="logo">
-          <a href="/">
+          <a href="/" title="logo, back to root page">
             <svg width="5em" viewBox="0 0 64 64">
               <circle cx="32" cy="32" r="30" stroke="#a3aec2" stroke-width="1" fill="#2E3440"></circle>
               <circle cx="32" cy="32" r="12" stroke="#800" stroke-width="1" fill="#c20"></circle>
@@ -28,7 +28,7 @@
             </svg>
           </a>
         </div>
-      <div id="preamble" class="status">
+      <header id="preamble" class="status" role="banner">
         <div class="content">
           <h1>$title$</h1>
           <div class="meta">
@@ -40,14 +40,14 @@
 $description$
           </div>
         </div>
-      </div>
-      <div id="content">
+      </header>
+      <main id="content" role="main">
 $if(toc)$<div id="toc">$table-of-contents$</div>$endif$
 $body$
-      </div>
-      <div id="postamble" class="status">
+      </main>
+      <footer id="postamble" class="status" role="contentinfo">
         <div class="content">
-          <nav>
+          <nav role="navigation">
             <a href="/index.html">Home</a> |
             <a href="/slides.html">Slides</a> |
             <a href="/about-me.html">About</a>
@@ -57,7 +57,7 @@ $body$
             <a href="#logo">↑ Top ↑</a>
           </nav>
         </div>
-      </div>
+      </footer>
     </div>
   </body>
 </html>