diff --git a/lib/config.tmpl b/lib/config.tmpl
index 3d1e54e03807888365500468447dc6a18f9bc065_bGliL2NvbmZpZy50bXBs..8eb8286542e876eddfd410e6f09601c848f799e8_bGliL2NvbmZpZy50bXBs 100644
--- a/lib/config.tmpl
+++ b/lib/config.tmpl
@@ -27,7 +27,7 @@
 [% download_linux_mb = 49 %]
 [% download_mac_mb = 48 %]
 
-[% betabaseversion = '2.53.2' %]
+[% betabaseversion = '2.53.3' %]
 [% betabetaversion = '1' %]
 [% betaversion = "${betabaseversion}b${betabetaversion}" %]
 [% betaname = "SeaMonkey ${betabaseversion} Beta ${betabetaversion}" %]
diff --git a/lib/sitemap.xml b/lib/sitemap.xml
index 3d1e54e03807888365500468447dc6a18f9bc065_bGliL3NpdGVtYXAueG1s..8eb8286542e876eddfd410e6f09601c848f799e8_bGliL3NpdGVtYXAueG1s 100644
--- a/lib/sitemap.xml
+++ b/lib/sitemap.xml
@@ -13,6 +13,9 @@
   <page url="news" title="News" id="news" />
 
   <page url="releases/" title="Download and Releases" id="releases">
+    <page url="releases/2.53.3b1" title="2.53.3 Beta 1" id="2.53.3b1" hide="false">
+      <page url="releases/seamonkey2.53.3/" title="Release Notes" id="seamonkey2.53.3"/>
+    </page>
     <page url="releases/2.53.2" title="2.53.2" id="2.53.2" hide="false">
       <page url="releases/seamonkey2.53.2/" title="Release Notes" id="seamonkey2.53.2"/>
     </page>
diff --git a/src/news.en.xml b/src/news.en.xml
index 3d1e54e03807888365500468447dc6a18f9bc065_c3JjL25ld3MuZW4ueG1s..8eb8286542e876eddfd410e6f09601c848f799e8_c3JjL25ld3MuZW4ueG1s 100644
--- a/src/news.en.xml
+++ b/src/news.en.xml
@@ -7,6 +7,29 @@
 -->
 
 <newsfeed title="SeaMonkey News" url="http://seamonkey-project.org/news">
+  <entry id="2020-06-15" showfront="true">
+    <headline>SeaMonkey 2.53.3 Beta 1 released</headline>
+    <content type="html" xml:lang="en">
+<![CDATA[<p>
+SeaMonkey 2.53.3 Beta 1 is
+<a href="releases/2.53.3b1">now available for free download</a> on the
+SeaMonkey website.
+</p>
+<p>
+2.53.3 will be an incremental update on the 2.53.x branch and incorporates a
+number of enhancements, changes and fixes to the application as well as those
+from the underlying platform code. <b>Before installing it make a full backup
+of your profile and thoroughly read and follow the
+<a href="releases/seamonkey2.53.3/">Release Notes</a></b>. We encourage testers
+to <a href="dev/get-involved">get involved</a> in discussing and reporting
+problems as well as further improving the product.
+</p>
+<p>
+SeaMonkey 2.53.3 Beta 1 is available in 22 languages, for Windows, MacOS x64
+and Linux.
+</p>]]>
+    </content>
+  </entry>
   <entry id="2020-05-03" showfront="true">
     <headline>SeaMonkey 2.53.2 released</headline>
     <content type="html" xml:lang="en">
@@ -45,7 +68,7 @@
 </p>]]>
     </content>
   </entry>
-  <entry id="2020-04-15" showfront="true">
+  <entry id="2020-04-15" showfront="false">
     <headline>SeaMonkey 2.53.2 Beta 1 released</headline>
     <content type="html" xml:lang="en">
 <![CDATA[<p>
@@ -67,7 +90,6 @@
 </p>]]>
     </content>
   </entry>
-
   <entry id="2020-02-28" showfront="false">
     <headline>SeaMonkey 2.53.1 released</headline>
     <content type="html" xml:lang="en">
diff --git a/src/releases/2.53.2.en.html b/src/releases/2.53.3b1.en.html
similarity index 91%
copy from src/releases/2.53.2.en.html
copy to src/releases/2.53.3b1.en.html
index 3d1e54e03807888365500468447dc6a18f9bc065_c3JjL3JlbGVhc2VzLzIuNTMuMi5lbi5odG1s..8eb8286542e876eddfd410e6f09601c848f799e8_c3JjL3JlbGVhc2VzLzIuNTMuM2IxLmVuLmh0bWw= 100644
--- a/src/releases/2.53.2.en.html
+++ b/src/releases/2.53.3b1.en.html
@@ -1,7 +1,7 @@
 [%- PROCESS release.tmpl -%]
-[%- smversion = '2.53.2' -%]
-[%- prettyversion = '2.53.2' -%]
-[%- relnoteversion = '2.53.2' -%]
+[%- smversion = '2.53.3b1' -%]
+[%- prettyversion = '2.53.3 Beta 1' -%]
+[%- relnoteversion = '2.53.3' -%]
 [%- mirrorred = false -%]
 [%- uselongversion = false -%]
 [%- usefulldetails = true -%]
@@ -5,7 +5,7 @@
 [%- mirrorred = false -%]
 [%- uselongversion = false -%]
 [%- usefulldetails = true -%]
-[%- releasedate = "May 3, 2020" -%]
+[%- releasedate = "June 15, 2020" -%]
 [%- srcsize = "278" -%]
 [%- l10nsrcsize = "11" -%]
 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
@@ -109,9 +109,9 @@
 <h2 id="source">Source code</h2>
 <div class="section">
   <p>The source code is available either as a tar package or from the
-    <a href="https://gitlab.com/seamonkey-project/seamonkey-2.53-comm/tree/2_53_2_final/">comm source repository</a>,
-    <a href="https://gitlab.com/seamonkey-project/seamonkey-2.53-mozilla/tree/2_53_2_final/">mozilla source repository</a> and
-    <a href="https://gitlab.com/seamonkey-project/seamonkey-2.53-l10n/tree/2_53_2_final/">l10n source repository</a> on GitLab.
+    <a href="https://gitlab.com/seamonkey-project/seamonkey-2.53-comm/tree/2_53_3_beta_01/">comm source repository</a>,
+    <a href="https://gitlab.com/seamonkey-project/seamonkey-2.53-mozilla/tree/2_53_3_beta_01/">mozilla source repository</a> and
+    <a href="https://gitlab.com/seamonkey-project/seamonkey-2.53-l10n/tree/2_53_3_beta_01/">l10n source repository</a> on GitLab.
   </p>
 
   <ul>
diff --git a/src/releases/index.en.html b/src/releases/index.en.html
index 3d1e54e03807888365500468447dc6a18f9bc065_c3JjL3JlbGVhc2VzL2luZGV4LmVuLmh0bWw=..8eb8286542e876eddfd410e6f09601c848f799e8_c3JjL3JlbGVhc2VzL2luZGV4LmVuLmh0bWw= 100644
--- a/src/releases/index.en.html
+++ b/src/releases/index.en.html
@@ -6,7 +6,7 @@
 [%- uselongversion = false -%]
 [%- usefulldetails = true -%]
 [%- releasedate = "May 3, 2020" -%]
-[%- betareleasedate = "April 15, 2020" -%]
+[%- betareleasedate = "June 15, 2020" -%]
 [%- srcsize = "278" -%]
 [%- l10nsrcsize = "11" -%]
 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
@@ -199,7 +199,8 @@
 <div class="para" id="old">
   <p>Previously released versions of SeaMonkey:</p>
   <ul class="snav">
-    <!-- <li><a href="2.53.2">2.53.2</a></li> -->
+    <!-- <li><a href="2.53.3b1">2.53.3 Beta 1</a></li> -->
+    <li><a href="2.53.2">2.53.2</a></li>
     <li><a href="2.53.2b1">2.53.2 Beta 1</a></li>
     <li><a href="2.53.1">2.53.1</a></li>
     <li><a href="2.53.1b1">2.53.1 Beta 1</a></li>
diff --git a/src/releases/seamonkey2.53.2/index.en.html b/src/releases/seamonkey2.53.3/index.en.html
similarity index 100%
copy from src/releases/seamonkey2.53.2/index.en.html
copy to src/releases/seamonkey2.53.3/index.en.html
diff --git a/src/releases/seamonkey2.53.2/relnote.var b/src/releases/seamonkey2.53.3/relnote.var
similarity index 56%
copy from src/releases/seamonkey2.53.2/relnote.var
copy to src/releases/seamonkey2.53.3/relnote.var
index 3d1e54e03807888365500468447dc6a18f9bc065_c3JjL3JlbGVhc2VzL3NlYW1vbmtleTIuNTMuMi9yZWxub3RlLnZhcg==..8eb8286542e876eddfd410e6f09601c848f799e8_c3JjL3JlbGVhc2VzL3NlYW1vbmtleTIuNTMuMy9yZWxub3RlLnZhcg== 100644
--- a/src/releases/seamonkey2.53.2/relnote.var
+++ b/src/releases/seamonkey2.53.3/relnote.var
@@ -1,9 +1,9 @@
-[%- rnote.baseversion = "2.53.2" -%]
-[%- rnote.basename = "SeaMonkey 2.53.2" -%]
-[%- rnote.version = "2.53.2" -%]
-[%- rnote.name = "SeaMonkey 2.53.2" -%]
-[%- rnote.relativeto.version = "2.53.1" -%]
-[%- rnote.relativeto.name = "SeaMonkey 2.53.1" -%]
+[%- rnote.baseversion = "2.53.3" -%]
+[%- rnote.basename = "SeaMonkey 2.53.3" -%]
+[%- rnote.version = "2.53.3b1" -%]
+[%- rnote.name = "SeaMonkey 2.53.3 Beta 1" -%]
+[%- rnote.relativeto.version = "2.53.2" -%]
+[%- rnote.relativeto.name = "SeaMonkey 2.53.2" -%]
 [%- rnote.relativeto.stable.version = "2.49.5" -%]
 [%- rnote.relativeto.stable.name = "SeaMonkey 2.49.5" -%]
 [%- changes.sm.ver = "253" -%]