diff --git a/Gemfile.lock b/Gemfile.lock
index e2855b5..c991999 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -105,12 +105,12 @@ GEM
     mime-types (3.3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2021.0225)
-    mini_portile2 (2.5.3)
+    mini_portile2 (2.6.1)
     minitest (5.14.4)
     multi_xml (0.6.0)
     multipart-post (2.1.1)
-    nokogiri (1.11.7)
-      mini_portile2 (~> 2.5.0)
+    nokogiri (1.12.5)
+      mini_portile2 (~> 2.6.1)
       racc (~> 1.4)
     nyan-cat-formatter (0.12.0)
       rspec (>= 2.99, >= 2.14.2, < 4)
diff --git a/spec/lib/diaspora_federation/discovery/h_card_spec.rb b/spec/lib/diaspora_federation/discovery/h_card_spec.rb
index 3c548c3..b9ea364 100644
--- a/spec/lib/diaspora_federation/discovery/h_card_spec.rb
+++ b/spec/lib/diaspora_federation/discovery/h_card_spec.rb
@@ -27,7 +27,7 @@ module DiasporaFederation
       <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
       <html>
         <head>
-          <meta charset="UTF-8"></meta>
+          <meta charset="UTF-8"/>
           <title>#{person.full_name}</title>
         </head>
         <body>
@@ -86,19 +86,19 @@ module DiasporaFederation
               <dl class="entity_photo">
                 <dt>Photo</dt>
                 <dd>
-                  <img class="photo avatar" width="300" height="300" src="#{photo_large_url}"></img>
+                  <img class="photo avatar" width="300" height="300" src="#{photo_large_url}"/>
                 </dd>
               </dl>
               <dl class="entity_photo_medium">
                 <dt>Photo_medium</dt>
                 <dd>
-                  <img class="photo avatar" width="100" height="100" src="#{photo_medium_url}"></img>
+                  <img class="photo avatar" width="100" height="100" src="#{photo_medium_url}"/>
                 </dd>
               </dl>
               <dl class="entity_photo_small">
                 <dt>Photo_small</dt>
                 <dd>
-                  <img class="photo avatar" width="50" height="50" src="#{photo_small_url}"></img>
+                  <img class="photo avatar" width="50" height="50" src="#{photo_small_url}"/>
                 </dd>
               </dl>
             </div>
@@ -137,10 +137,9 @@ module DiasporaFederation
       it "reads minimal hCard" do
         minimal_html = <<~HTML
           <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
-          <html xmlns="http://www.w3.org/1999/xhtml">
+          <html>
             <head>
-              <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
-              <meta charset="UTF-8" />
+              <meta charset="UTF-8"/>
               <title>#{person.full_name}</title>
             </head>
             <body>
@@ -187,19 +186,19 @@ module DiasporaFederation
                   <dl class="entity_photo">
                     <dt>Photo</dt>
                     <dd>
-                      <img class="photo avatar" width="300" height="300" src="#{photo_large_url}" />
+                      <img class="photo avatar" width="300" height="300" src="#{photo_large_url}"/>
                     </dd>
                   </dl>
                   <dl class="entity_photo_medium">
                     <dt>Photo_medium</dt>
                     <dd>
-                      <img class="photo avatar" width="100" height="100" src="#{photo_medium_url}" />
+                      <img class="photo avatar" width="100" height="100" src="#{photo_medium_url}"/>
                     </dd>
                   </dl>
                   <dl class="entity_photo_small">
                     <dt>Photo_small</dt>
                     <dd>
-                      <img class="photo avatar" width="50" height="50" src="#{photo_small_url}" />
+                      <img class="photo avatar" width="50" height="50" src="#{photo_small_url}"/>
                     </dd>
                   </dl>
                 </div>
