diff --git a/502.html b/502.html
index 98f4dbb..a65c3cd 100644
--- a/502.html
+++ b/502.html
@@ -49,7 +49,7 @@
         <br>
         <div class="popup">
             <div>
-                <img class="logo" src="logo.png" alt="LQDOJ">
+                <img class="logo" src="logo.svg" alt="LQDOJ">
             </div>
             <h1 style="width: 100%;">Oops, LQDOJ is down now.</h1>
         </div>
diff --git a/judge/utils/email_render.py b/judge/utils/email_render.py
index 5d790f5..a092f88 100644
--- a/judge/utils/email_render.py
+++ b/judge/utils/email_render.py
@@ -8,7 +8,6 @@ def render_email_message(request, contexts):
     email_contexts = {
         "username": request.user.username,
         "domain": current_site.domain,
-        "protocol": "https" if request.is_secure() else "http",
         "site_name": settings.SITE_NAME,
         "message": None,
         "title": None,
diff --git a/resources/common.js b/resources/common.js
index c82d0ad..006ff88 100644
--- a/resources/common.js
+++ b/resources/common.js
@@ -148,7 +148,7 @@ function register_time(elems, limit) { // in hours
 }
 
 window.notification_template = {
-    icon: '/logo.png'
+    icon: '/logo.svg'
 };
 window.notification_timeout = 5000;
 
diff --git a/resources/icons/icon.svg b/resources/icons/icon.svg
new file mode 100644
index 0000000..f16e119
--- /dev/null
+++ b/resources/icons/icon.svg
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
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+</svg>
diff --git a/resources/icons/logo.svg b/resources/icons/logo.svg
new file mode 100644
index 0000000..82d8f95
--- /dev/null
+++ b/resources/icons/logo.svg
@@ -0,0 +1 @@
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--3 -10 6 0 13 -10 15 -22 2 -15 13 -24 35 -30 23 -6 37 -19 52 -51 33 -67 199
--247 228 -247 7 0 16 -6 20 -13 4 -7 26 -21 48 -32 22 -11 42 -22 45 -25 7 -7
-53 -27 64 -28 5 0 12 -5 15 -11 4 -5 19 -12 35 -15 15 -3 34 -10 41 -16 10 -8
-14 -7 18 2 4 10 6 10 6 1 1 -7 6 -13 12 -13 5 0 7 6 3 12 -5 9 -2 9 9 -1 9 -7
-17 -10 17 -5 0 5 5 2 10 -6 7 -11 10 -11 10 -2 0 7 5 10 10 7 6 -4 8 -11 5
--16 -4 -5 -1 -9 4 -9 6 0 11 7 11 16 0 8 4 13 10 9 5 -3 7 -13 4 -23 -4 -10
--3 -13 3 -6 8 11 52 12 69 1 5 -3 16 -2 24 3 8 5 22 5 32 -1 12 -6 18 -6 18 1
-0 5 5 10 11 10 5 0 7 -6 3 -12 -5 -9 -2 -9 9 1 13 10 17 10 17 1 0 -9 4 -9 17
-1 15 12 16 12 8 -1 -7 -13 -6 -13 7 -2 13 10 17 10 21 0 4 -10 6 -10 6 0 1 6
-9 12 19 12 10 0 24 6 31 12 11 11 12 10 6 -2 -8 -13 -7 -13 8 -1 9 7 17 11 17
-7 0 -3 16 0 35 8 19 8 35 12 35 9 0 -3 7 0 15 7 8 7 15 10 15 6 0 -3 32 10 70
-30 39 21 70 41 70 45 0 4 9 11 21 14 24 8 52 29 82 62 11 12 25 19 31 16 6 -3
-8 -3 4 2 -4 4 9 22 28 40 18 18 34 37 34 44 0 6 4 11 10 11 5 0 24 25 41 55
-17 30 35 55 41 55 5 0 7 4 4 9 -3 5 1 14 9 21 8 7 12 16 9 21 -3 5 -2 9 3 8
-24 -4 43 2 37 13 -4 7 -3 8 5 4 12 -8 44 18 34 28 -4 3 -1 6 5 6 6 0 9 7 6 15
--4 8 1 17 10 21 14 5 14 9 4 22 -7 9 -8 13 -2 9 12 -7 38 39 29 53 -3 4 5 10
-18 14 18 5 19 8 7 15 -12 9 -12 11 3 17 9 3 14 10 11 15 -3 5 0 9 5 9 6 0 11
-6 11 14 0 8 6 17 13 19 7 4 6 6 -4 6 -9 1 -20 8 -23 17 -4 9 -13 14 -21 10 -8
--3 -15 -1 -15 4 0 6 -6 10 -14 10 -17 0 -41 28 -41 49 0 9 -4 22 -8 29 -5 6
--4 12 1 12 5 0 6 17 2 40 -5 25 -4 40 3 40 6 0 6 5 0 13 -5 6 -9 56 -9 109 1
-54 -3 98 -7 98 -5 0 -5 5 -1 12 4 7 6 35 5 62 -2 28 -4 64 -5 80 -1 16 -7 31
--14 34 -7 2 -10 8 -7 13 4 5 -1 6 -10 3 -8 -4 -25 0 -38 8 -12 8 -41 20 -64
-28 -24 7 -43 17 -43 22 0 4 -3 8 -7 7 -16 -2 -53 14 -53 22 0 5 -3 8 -7 7 -10
--4 -73 23 -74 31 -2 9 -7 42 -14 86 -3 22 -8 51 -11 65 -4 14 -7 44 -8 67 0
-22 -4 39 -8 36 -5 -2 -8 0 -8 6 0 10 -93 57 -130 65 -3 1 -15 7 -27 14 -13 7
--23 9 -23 5 0 -4 -4 -3 -8 2 -11 16 -102 56 -113 50 -5 -4 -12 1 -15 10 -5 13
--9 14 -14 4 -7 -10 -11 -9 -22 2 -8 8 -15 17 -16 22 -1 4 -3 9 -3 12 -1 3 -3
-10 -4 15 -1 6 -4 12 -5 15 -1 3 -3 8 -4 13 -18 83 -32 132 -37 132 -4 0 -10 8
--12 18 -3 9 -5 11 -6 5z"/>
-</g>
-</svg>
diff --git a/resources/pagedown/Markdown.Editor.js b/resources/pagedown/Markdown.Editor.js
index ada1ad6..7842448 100644
--- a/resources/pagedown/Markdown.Editor.js
+++ b/resources/pagedown/Markdown.Editor.js
@@ -44,7 +44,7 @@
 
         image: "Image <img> Ctrl+G",
         imagedescription: "enter image description here",
-        imagedialog: "<p><b>Insert Image</b></p><p>https://dmoj.ca/logo.png \"optional title\"<br><br>Need <a href='http://www.google.com/search?q=free+image+hosting' target='_blank'>free image hosting?</a></p>",
+        imagedialog: "<p><b>Insert Image</b></p><p>https://lqdoj.edu.vn/logo.png \"optional title\"<br><br>Need <a href='http://www.google.com/search?q=free+image+hosting' target='_blank'>free image hosting?</a></p>",
 
         olist: "Numbered List <ol> Ctrl+O",
         ulist: "Bulleted List <ul> Ctrl+U",
diff --git a/templates/chat/online_status.html b/templates/chat/online_status.html
index e863d7d..470e15a 100644
--- a/templates/chat/online_status.html
+++ b/templates/chat/online_status.html
@@ -1,6 +1,6 @@
 <li class="status-row" id="lobby_row">
   <div class="status-container">
-    <img src="{{ static('icons/logo.png') }}" style="height:1.3em">
+    <img src="{{ static('icons/logo.svg') }}" style="height:1.3em">
   </div>
   <span style="padding-left:0.5em">
     <b>{{_('Lobby')}}</b>
diff --git a/templates/chat/user_online_status.html b/templates/chat/user_online_status.html
index 06b6729..49e3fdb 100644
--- a/templates/chat/user_online_status.html
+++ b/templates/chat/user_online_status.html
@@ -11,7 +11,7 @@
   </div>
 {% else %}
   <div class="status-container" style="height: 3em;">
-    <img src="{{ static('icons/logo.png') }}" class="info-pic" style="border-radius: 0px;">
+    <img src="{{ static('icons/logo.svg') }}" class="info-pic" style="border-radius: 0px;">
   </div>
 {% endif %}
 <span class="info-name username">
diff --git a/templates/general_email.html b/templates/general_email.html
index 0fcdbbb..fe2d510 100644
--- a/templates/general_email.html
+++ b/templates/general_email.html
@@ -8,7 +8,7 @@
 
 <div style="max-width: 600px; margin: 0 auto; padding: 20px; background-color: #ffffff; box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);">
   <div style="text-align: center; margin-bottom: 20px;">
-    <img src="{{ protocol }}://{{ domain }}{{static('icons/logo.png')}}" alt="{{site_name}}" style="max-width: 150px;">
+    <img src="{{ DMOJ_SCHEME }}://{{ domain }}{{static('icons/logo.svg')}}" alt="{{site_name}}" style="max-width: 150px;">
   </div>
   <div style="margin-bottom: 20px; text-align: center;">
     <h2>{{title}}</h2>
diff --git a/templates/organization/list.html b/templates/organization/list.html
index e387daa..a7530d5 100644
--- a/templates/organization/list.html
+++ b/templates/organization/list.html
@@ -32,7 +32,7 @@
     <div class="organization-container toggled">
       {% for org in queryset %}
         <a href="{{ org.get_absolute_url() }}" class="organization-row" title="{{org.about}}">
-          <img class="org-logo" loading="lazy" src="{{ org.logo_override_image or static('icons/icon.png') }}">
+          <img class="org-logo" loading="lazy" src="{{ org.logo_override_image or static('icons/logo.svg') }}">
           <span style="margin-right: auto">{{ org.name }}</span>
           <span style="font-weight: normal"><i>{{ org.member_count }} {{_('members')}}</i></span>
         </a>
diff --git a/templates/recent-organization.html b/templates/recent-organization.html
index 95b5ee1..7636104 100644
--- a/templates/recent-organization.html
+++ b/templates/recent-organization.html
@@ -22,7 +22,7 @@
     <div class="toggled sidebox-content">
       {% for organization in recent_organizations %}
         <a href="{{ url('organization_home', organization.organization.pk, organization.organization.slug) }}" class="organization-row" title="{{organization.organization.about}}">
-          <img class="org-logo" loading="lazy" src="{{ organization.organization.logo_override_image or static('icons/icon.png') }}">
+          <img class="org-logo" loading="lazy" src="{{ organization.organization.logo_override_image or static('icons/icon.svg') }}">
           <span style="word-break: break-word;">{{ organization.organization }}</span>
         </a>
       {% endfor %}
diff --git a/templates/registration/activation_email.html b/templates/registration/activation_email.html
index 25bf421..0655483 100644
--- a/templates/registration/activation_email.html
+++ b/templates/registration/activation_email.html
@@ -4,7 +4,6 @@
 {% set username = user.get_username() %}
 {% set button_text = _("Activate") %}
 {% set domain = site.domain %}
-{% set protocol = "http" %}
 {% include "general_email.html" %}
 <br>
 {{_("Alternatively, you can reply to this message to activate your account. Your reply must keep the following text intact for this to work:")}}
diff --git a/templates/site-logo-fragment.html b/templates/site-logo-fragment.html
index fb86795..b5c30b0 100644
--- a/templates/site-logo-fragment.html
+++ b/templates/site-logo-fragment.html
@@ -5,6 +5,6 @@
 {% elif logo_override_image is defined and logo_override_image %}
   <img src="{{ logo_override_image|camo }}" alt="{{ SITE_NAME }}" height="44" style="border: none">
 {% else %}
-  <img src="{{ static('icons/logo.png') }}" alt="{{ SITE_NAME }}" height="44"
+  <img src="{{ static('icons/logo.svg') }}" alt="{{ SITE_NAME }}" height="44"
     onerror="this.src=&quot;{{ static('icons/logo.png') }}&quot;; this.onerror=null" style="border: none">
 {% endif %}