diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d9466102..b0a1d7a0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,7 +23,7 @@ jobs:
         with:
           name: devenv
       - name: Install devenv.sh
-        run: nix profile install tarball+https://install.devenv.sh/latest
+        run: nix profile add nixpkgs#devenv
       - name: Cache dependencies
         uses: actions/cache@v4
         with:
diff --git a/.gitignore b/.gitignore
index 0e57b730..f4575879 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,4 @@
 devenv.local.nix
 .direnv
 .pre-commit-config.yaml
+Gemfile.lock
diff --git a/Gemfile.lock b/Gemfile.lock
deleted file mode 100644
index 2c2229c0..00000000
--- a/Gemfile.lock
+++ /dev/null
@@ -1,115 +0,0 @@
-GEM
-  remote: https://rubygems.org/
-  specs:
-    addressable (2.8.7)
-      public_suffix (>= 2.0.2, < 7.0)
-    base64 (0.2.0)
-    bigdecimal (3.1.9)
-    colorator (1.1.0)
-    concurrent-ruby (1.3.5)
-    csv (3.3.2)
-    em-websocket (0.5.3)
-      eventmachine (>= 0.12.9)
-      http_parser.rb (~> 0)
-    eventmachine (1.2.7)
-    ffi (1.17.1)
-    ffi (1.17.1-arm64-darwin)
-    ffi (1.17.1-x86_64-darwin)
-    ffi (1.17.1-x86_64-linux-gnu)
-    forwardable-extended (2.6.0)
-    google-protobuf (4.29.3)
-      bigdecimal
-      rake (>= 13)
-    google-protobuf (4.29.3-arm64-darwin)
-      bigdecimal
-      rake (>= 13)
-    google-protobuf (4.29.3-x86_64-darwin)
-      bigdecimal
-      rake (>= 13)
-    google-protobuf (4.29.3-x86_64-linux)
-      bigdecimal
-      rake (>= 13)
-    http_parser.rb (0.8.0)
-    i18n (1.14.7)
-      concurrent-ruby (~> 1.0)
-    jekyll (4.4.1)
-      addressable (~> 2.4)
-      base64 (~> 0.2)
-      colorator (~> 1.0)
-      csv (~> 3.0)
-      em-websocket (~> 0.5)
-      i18n (~> 1.0)
-      jekyll-sass-converter (>= 2.0, < 4.0)
-      jekyll-watch (~> 2.0)
-      json (~> 2.6)
-      kramdown (~> 2.3, >= 2.3.1)
-      kramdown-parser-gfm (~> 1.0)
-      liquid (~> 4.0)
-      mercenary (~> 0.3, >= 0.3.6)
-      pathutil (~> 0.9)
-      rouge (>= 3.0, < 5.0)
-      safe_yaml (~> 1.0)
-      terminal-table (>= 1.8, < 4.0)
-      webrick (~> 1.7)
-    jekyll-archives (2.3.0)
-      jekyll (>= 3.6, < 5.0)
-    jekyll-redirect-from (0.16.0)
-      jekyll (>= 3.3, < 5.0)
-    jekyll-relative-links (0.7.0)
-      jekyll (>= 3.3, < 5.0)
-    jekyll-sass-converter (3.0.0)
-      sass-embedded (~> 1.54)
-    jekyll-seo-tag (2.8.0)
-      jekyll (>= 3.8, < 5.0)
-    jekyll-watch (2.2.1)
-      listen (~> 3.0)
-    json (2.9.1)
-    kramdown (2.5.1)
-      rexml (>= 3.3.9)
-    kramdown-parser-gfm (1.1.0)
-      kramdown (~> 2.0)
-    liquid (4.0.4)
-    listen (3.9.0)
-      rb-fsevent (~> 0.10, >= 0.10.3)
-      rb-inotify (~> 0.9, >= 0.9.10)
-    mercenary (0.4.0)
-    pathutil (0.16.2)
-      forwardable-extended (~> 2.6)
-    public_suffix (6.0.1)
-    rake (13.2.1)
-    rb-fsevent (0.11.2)
-    rb-inotify (0.11.1)
-      ffi (~> 1.0)
-    rexml (3.4.2)
-    rouge (4.5.1)
-    safe_yaml (1.0.5)
-    sass-embedded (1.83.4)
-      google-protobuf (~> 4.29)
-      rake (>= 13)
-    sass-embedded (1.83.4-arm64-darwin)
-      google-protobuf (~> 4.29)
-    sass-embedded (1.83.4-x86_64-darwin)
-      google-protobuf (~> 4.29)
-    sass-embedded (1.83.4-x86_64-linux-gnu)
-      google-protobuf (~> 4.29)
-    terminal-table (3.0.2)
-      unicode-display_width (>= 1.1.1, < 3)
-    unicode-display_width (2.6.0)
-    webrick (1.9.1)
-
-PLATFORMS
-  universal-darwin
-  x86_64-linux
-  x86_64-unknown
-
-DEPENDENCIES
-  jekyll (~> 4.3)
-  jekyll-archives
-  jekyll-redirect-from
-  jekyll-relative-links
-  jekyll-seo-tag
-  kramdown-parser-gfm
-  webrick (~> 1.7)
-
-BUNDLED WITH
-   2.5.19
diff --git a/_data/sponsor_logos_corporate.csv b/_data/sponsor_logos_corporate.csv
index a882bc9e..b0a7e5c9 100644
--- a/_data/sponsor_logos_corporate.csv
+++ b/_data/sponsor_logos_corporate.csv
@@ -1,3 +1,3 @@
-logo,name,url,last_payment,all_time,since,level
-sponsors/84.png,84codes,https://www.84codes.com/,"€22,000","€765,000","Apr 1, 2018",5000
-manas-orange.svg,Manas.Tech,https://manas.tech/,"$5,000","$1,390,000","Jun 19, 2009",5000
+logo,logo_email,name,url,last_payment,all_time,since,level
+sponsors/84.png,sponsors/84.png,84codes,https://www.84codes.com/,"€22,000","€765,000","Apr 1, 2018",5000
+manas-orange.svg,manas-orange.png,Manas.Tech,https://manas.tech/,"$5,000","$1,390,000","Jun 19, 2009",5000
diff --git a/_includes/newsletter/footer_sponsors.html b/_includes/newsletter/footer_sponsors.html
index a0b663f9..09428559 100644
--- a/_includes/newsletter/footer_sponsors.html
+++ b/_includes/newsletter/footer_sponsors.html
@@ -1,18 +1,29 @@
-
 <table border="0" cellpadding="0" cellspacing="0" width="100%">
   <tr>
     <td colspan="4" valign="top" width="25%" style="text-align: center; padding-top: 37px; padding-bottom: 32px;" class="textContent">
-       <h3 style="text-align: center">Thanks to our sponsors</h3>
+      <h3 style="text-align: center">Thanks to our sponsors</h3>
     </td>
   </tr>
   <tr>
     {%- for sp in site.data.sponsor_logos_corporate %}
     <td valign="top" width="25%" style="text-align: center" class="textContent">
-          <a href="{{ sp.url }}" target="_blank" class="sponsor" title="{{ sp.name }}" rel="sponsored nofollow">
-              <img src="/assets/{{ sp.logo }}" width="82" border="0">
+      <table border="0" cellpadding="0" cellspacing="0" align="center">
+        <tr>
+          <td align="center">
+            <a href="{{ sp.url }}" target="_blank" class="sponsor" title="{{ sp.name }}" rel="sponsored nofollow">
+              <img src="https://crystal-lang.org/assets/{{ sp.logo_email }}" width="82" border="0" style="display:block;">
+            </a>
+          </td>
+        </tr>
+        <tr>
+          <td align="center" style="padding-top:6px;">
+            <a href="{{ sp.url }}" target="_blank" class="sponsor" title="{{ sp.name }}" rel="sponsored nofollow" style="text-decoration:none; color:#000000;">
               <span class="small">{{ sp.name }}</span>
-          </a>
-      </td>
+            </a>
+          </td>
+        </tr>
+      </table>
+    </td>
     {%- endfor %}
   </tr>
-</table>
+</table>
\ No newline at end of file
diff --git a/_layouts/email.html b/_layouts/email.html
index 01435c77..b907504f 100644
--- a/_layouts/email.html
+++ b/_layouts/email.html
@@ -33,6 +33,8 @@
         h1, h2, h3, h4, h5, h6 {
             margin: 0;
             padding: 0;
+            color: #000000 !important;
+            text-decoration: none !important
         }
 
         p {
@@ -436,7 +438,8 @@
 <!--[if !gte mso 9]><!----><span class="mcnPreview Text" style="display:none; font-size:0px; line-height:0px; max-height:0px; max-width:0px; opacity:0; overflow:hidden; visibility:hidden; mso-hide:all;">*|MC_PREVIEW_TEXT|*</span><!--<![endif]-->
 <!--*|END:IF|*-->
 <center>
-    <table border="0" cellpadding="0" cellspacing="0" height="100%" width="100%" id="bodyTable">
+    <table border="0" cellpadding="0" cellspacing="0" height="100%" width="100%" id="bodyTable" style="border-collapse:collapse; mso-table-lspace:0pt; mso-table-rspace:0pt;">
+
 
         <tr>
             <td class=headerCell>
diff --git a/assets/manas-orange.png b/assets/manas-orange.png
new file mode 100644
index 00000000..c7dec4af
Binary files /dev/null and b/assets/manas-orange.png differ