diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..62c8935
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.idea/
\ No newline at end of file
diff --git a/dark.css b/dark.css
index a2305b0..751dc3c 100644
--- a/dark.css
+++ b/dark.css
@@ -831,4 +831,11 @@
     #edge-translate-panel-body {
         color: var(--darkreader-neutral-text) !important;
     }
+
+    .spon-logo-dark {
+        display: inherit;
+    }
+    .spon-logo-light {
+        display: none;
+    }
 }
\ No newline at end of file
diff --git a/index.html b/index.html
index c8ed7b1..d78c619 100644
--- a/index.html
+++ b/index.html
@@ -118,9 +118,9 @@ <h2>And it is free</h2>
 
 	<section>
 	<footer>
-		<p class="left"><a href="https://www.jetbrains.com/pycharm/"><img src="/pycharm.png" alt="PyCharm Logo" width="43" height="43"></a> &nbsp;</p>
+		<p class="left"><a href="https://www.jetbrains.com/pycharm/"><img src="/pycharm/PyCharm_icon.png" alt="PyCharm Logo" height="43"></a> &nbsp;</p>
 		<p class="left"><a href="/sponsors.html#jetbrains">Made with<br>PyCharm</a></p>
-		<p class="right">© Copyright 2015-2024. Licensed by <a href="https://creativecommons.org/licenses/by/3.0/" rel="license" target="_blank">Creative Commons</a>.</p>
+		<p class="right">© Copyright 2015-2026. Licensed by <a href="https://creativecommons.org/licenses/by/3.0/" rel="license" target="_blank">Creative Commons</a>.</p>
 	</footer>
 	</section>
 
diff --git a/jetbrains.png b/jetbrains.png
deleted file mode 100644
index ccceb95..0000000
Binary files a/jetbrains.png and /dev/null differ
diff --git a/jetbrains/jetbrains-white.png b/jetbrains/jetbrains-white.png
new file mode 100644
index 0000000..7e1694d
Binary files /dev/null and b/jetbrains/jetbrains-white.png differ
diff --git a/jetbrains/jetbrains.png b/jetbrains/jetbrains.png
new file mode 100644
index 0000000..68bdde8
Binary files /dev/null and b/jetbrains/jetbrains.png differ
diff --git a/pycharm.png b/pycharm.png
deleted file mode 100644
index 4f85fcc..0000000
Binary files a/pycharm.png and /dev/null differ
diff --git a/pycharm/PyCharm-white.png b/pycharm/PyCharm-white.png
new file mode 100644
index 0000000..dfa5d71
Binary files /dev/null and b/pycharm/PyCharm-white.png differ
diff --git a/pycharm/PyCharm.png b/pycharm/PyCharm.png
new file mode 100644
index 0000000..e500847
Binary files /dev/null and b/pycharm/PyCharm.png differ
diff --git a/pycharm/PyCharm_icon.png b/pycharm/PyCharm_icon.png
new file mode 100644
index 0000000..1755f7d
Binary files /dev/null and b/pycharm/PyCharm_icon.png differ
diff --git a/sponsors.html b/sponsors.html
index b6ae936..80111dd 100644
--- a/sponsors.html
+++ b/sponsors.html
@@ -69,8 +69,11 @@ <h2 class="subtitle">We have made you a wrapper you can't refuse</h2>
 		<h1>Sponsors</h1>
 
 		<h2 class="nocaps">JetBrains</h2>
-		<div class="spon-logo">
-			<a href="https://www.jetbrains.com/"><img src="/jetbrains.png" alt="JetBrains Logo" width="250" height="271"></a>
+		<div class="spon-logo spon-logo-light">
+			<a href="https://www.jetbrains.com/"><img src="/jetbrains/jetbrains.png" alt="JetBrains Logo" width="250"></a>
+		</div>
+		<div class="spon-logo spon-logo-dark">
+			<a href="https://www.jetbrains.com/"><img src="/jetbrains/jetbrains-white.png" alt="JetBrains Logo" width="250"></a>
 		</div>
 		<div class="spon-text">
 			JetBrains supports this project by providing PyCharm Professional licenses to the core developers under their <a href="https://www.jetbrains.com/buy/opensource/">support program for Open Source projects</a>.
@@ -83,9 +86,9 @@ <h2 class="nocaps">JetBrains</h2>
 
 	<section>
 		<footer>
-			<p class="left"><a href="https://www.jetbrains.com/pycharm/"><img src="/pycharm.png" alt="PyCharm Logo" width="43" height="43"></a> &nbsp;</p>
+			<p class="left"><a href="https://www.jetbrains.com/pycharm/"><img src="/pycharm/PyCharm_icon.png" alt="PyCharm Logo" height="43"></a> &nbsp;</p>
 			<p class="left"><a href="/sponsors.html#jetbrains">Made with<br>PyCharm</a></p>
-			<p class="right">© Copyright 2015-2024. Licensed by <a href="https://creativecommons.org/licenses/by/3.0/" rel="license" target="_blank">Creative Commons</a>.</p>
+			<p class="right">© Copyright 2015-2026. Licensed by <a href="https://creativecommons.org/licenses/by/3.0/" rel="license" target="_blank">Creative Commons</a>.</p>
 		</footer>
 	</section>
 
diff --git a/style.css b/style.css
index 2e656e9..8f24d87 100644
--- a/style.css
+++ b/style.css
@@ -114,12 +114,18 @@ footer {
     display: block;
     float: left;
     width: 250px;
+    padding: 20px;
+    padding-left: 0;
+}
+
+.spon-logo-dark {
+    display: none;
 }
 
 .spon-text {
-    display: block;
+    /*display: block;*/
     float: left;
-    padding-left: 12px;
+    /*padding-left: 12px;*/
     width: 460px;
 }
 
diff --git a/verify-releases.html b/verify-releases.html
index f5e1ca8..0ae9054 100644
--- a/verify-releases.html
+++ b/verify-releases.html
@@ -89,34 +89,48 @@ <h2 class="subtitle">We have made you a wrapper you can't refuse</h2>
 		<br>
 		<h1>Verifying releases</h1>
 
-		<p>
-			We sign all the releases with a GPG key.
-			The signatures are uploaded to both the <a
-				href="https://github.com/python-telegram-bot/python-telegram-bot/releases">GitHub
-			releases page</a> and the <a href="https://pypi.org/project/python-telegram-bot/">PyPI
-			project</a> and end with a suffix <code>.asc</code>.
-			Please find the public keys below.
-			The keys are named in the format
-			<code>&lt;first_version&gt;-&lt;last_version&gt;.gpg</code> or <code>&lt;first_version&gt;-current.gpg</code>
-			if the key is currently being used for new releases.
-		</p>
-		<br>
-		<p>
-			In addition, the GitHub release page also contains the sha1 hashes of the release files
-			in the files with the suffix <code>.sha1</code>.
-		</p>
-		<br>
-		<p>
-			This allows you to verify that a release file that you downloaded was indeed provided by
-			the <code>python-telegram-bot</code> team.
-		</p>
-		<br>
+        <p>
+            To enable you to verify that a release file that you downloaded was indeed provided by
+            the <code>python-telegram-bot</code> team, we have taken the following measures.
+        </p>
+        <br>
+        <p>
+            Starting with v21.4, all releases are signed via <a href="https://sigstore.dev">sigstore</a>.
+            The corresponding signature files are uploaded to the <a
+                href="https://github.com/python-telegram-bot/python-telegram-bot/releases">GitHub
+            releases page</a>.
+            To verify the signature, please install the <a
+                href="https://pypi.org/project/sigstore/">sigstore Python client</a> and follow the
+            instructions for <a
+                href="https://github.com/sigstore/sigstore-python#signatures-from-github-actions">verifying
+            signatures from GitHub Actions</a>. As input for the <code>--repository</code>
+            parameter, please use the value <code>python-telegram-bot/python-telegram-bot</code>.
+        </p>
+        <br>
+        <p>
+            Earlier releases are signed with a GPG key.
+            The signatures are uploaded to both the <a
+                href="https://github.com/python-telegram-bot/python-telegram-bot/releases">GitHub
+            releases page</a>
+            and the <a href="https://pypi.org/project/python-telegram-bot/">PyPI project</a> and end
+            with a suffix <code>.asc</code>.
+            Please find the public keys below or <a
+                href="https://github.com/python-telegram-bot/python-telegram-bot/tree/master/public_keys">here</a>.
+            The keys are named in the format
+            <code>&lt;first_version&gt;-&lt;last_version&gt;.gpg</code>.
+        </p>
+        <br>
+        <p>
+            In addition, the GitHub release page also contains the sha1 hashes of the release files
+            in the files with the suffix <code>.sha1</code>.
+        </p>
+        <br>
 
 		<h2>Public keys</h2>
 
 		<div class="window">
 			<details>
-				<summary><div class="file-name">v20.0-current.gpg</div></summary>
+				<summary><div class="file-name">v20.0-v21.3.gpg</div></summary>
 				<pre>
 -----BEGIN PGP PUBLIC KEY BLOCK-----
 
@@ -257,13 +271,12 @@ <h2>Public keys</h2>
 
 <section>
 	<footer>
-		<p class="left"><a href="https://www.jetbrains.com/pycharm/"><img src="/pycharm.png"
+		<p class="left"><a href="https://www.jetbrains.com/pycharm/"><img src="/pycharm/PyCharm_icon.png"
 																		  alt="PyCharm Logo"
-																		  width="43"
 																		  height="43"></a> &nbsp;
 		</p>
 		<p class="left"><a href="/sponsors.html#jetbrains">Made with<br>PyCharm</a></p>
-		<p class="right">© Copyright 2015-2024. Licensed by <a
+		<p class="right">© Copyright 2015-2026. Licensed by <a
 				href="https://creativecommons.org/licenses/by/3.0/" rel="license" target="_blank">Creative
 			Commons</a>.</p>
 	</footer>