diff --git a/seamonkey-2.53.18.source-l10n.tar.xz b/seamonkey-2.53.18.1.source-l10n.tar.xz
similarity index 100%
rename from seamonkey-2.53.18.source-l10n.tar.xz
rename to seamonkey-2.53.18.1.source-l10n.tar.xz
diff --git a/seamonkey-2.53.18.1.source.tar.xz b/seamonkey-2.53.18.1.source.tar.xz
new file mode 100644
index 0000000..c885e3e
--- /dev/null
+++ b/seamonkey-2.53.18.1.source.tar.xz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6fbd622e6554ed881f9eec00c3f346f9aeecbc459d5f9e16ef2636c563607040
+size 252530876
diff --git a/seamonkey-2.53.18.source.tar.xz b/seamonkey-2.53.18.source.tar.xz
deleted file mode 100644
index 774d69a..0000000
--- a/seamonkey-2.53.18.source.tar.xz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:cef8349e2c9343871f46e08be75dbc8b02206d40df1e332c82f592b600911911
-size 252379244
diff --git a/seamonkey.changes b/seamonkey.changes
index af2839a..8a3e549 100644
--- a/seamonkey.changes
+++ b/seamonkey.changes
@@ -1,3 +1,22 @@
+-------------------------------------------------------------------
+Wed Jan 18 00:10:28 UTC 2024 - Tristan Miller <psychonaut@nothingisreal.com>
+
+- update to SeaMonkey 2.53.18.1
+  * Update the NSS library to the latest esr 115 version for the final
+    2.53.18.1 release.
+  * SeaMonkey 2.53.18.1 uses the same backend as Firefox and contains
+    the relevant Firefox 60.8 security fixes.
+  * SeaMonkey 2.53.18.1 shares most parts of the mail and news code
+    with Thunderbird. Please read the Thunderbird 60.8.0 release notes
+    for specific security fixes in this release.
+  * Additional important security fixes up to Current Firefox 115.7
+    and Thunderbird 115.7 ESR plus many enhancements have been
+    backported. We will continue to enhance SeaMonkey security in
+    subsequent 2.53.x beta and release versions as fast as we are able
+    to.
+- request inclusion in Leap 15.5 and 15.6:
+  https://bugzilla.opensuse.org/show_bug.cgi?id=1218961
+
 -------------------------------------------------------------------
 Sun Dec 09 14:26:01 UTC 2023 - Tristan Miller <psychonaut@nothingisreal.com>
 
@@ -20,6 +39,7 @@ Sun Dec 09 14:26:01 UTC 2023 - Tristan Miller <psychonaut@nothingisreal.com>
   and TOP-NOBUG-revendor-253172.patch
 - request inclusion in Leap 15.4, 15.5, and 15.6:
   https://bugzilla.opensuse.org/show_bug.cgi?id=1217916
+- disable --with-system-nss on Leap 15.5 to work around build breakage
 
 -------------------------------------------------------------------
 Wed Nov 01 17:37:55 UTC 2023 - Tristan Miller <psychonaut@nothingisreal.com>
diff --git a/seamonkey.spec b/seamonkey.spec
index 6389663..1266972 100644
--- a/seamonkey.spec
+++ b/seamonkey.spec
@@ -3,7 +3,7 @@
 #
 # Copyright (c) 2018 SUSE LINUX GmbH, Nuernberg, Germany.
 #               2006-2018 Wolfgang Rosenauer
-#               2018-2023 Tristan Miller
+#               2018-2024 Tristan Miller
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -72,9 +72,9 @@ BuildRequires:  clang-devel >= 5
 %endif
 Provides:       web_browser
 Provides:       browser(npapi)
-Version:        2.53.18
+Version:        2.53.18.1
 Release:        0
-%define releasedate 20231209000000
+%define releasedate 20240116000000
 Summary:        An integrated web browser, composer, mail/news client, and IRC client
 License:        MPL-2.0
 Group:          Productivity/Networking/Web/Browsers
@@ -142,8 +142,10 @@ Provides:       seamonkey-dom-inspector = %{version}
 # the following conditions are always met in Factory by definition
 BuildRequires:  mozilla-nspr-devel >= 4.13.1
 PreReq:         mozilla-nspr >= %(rpm -q --queryformat '%%{VERSION}' mozilla-nspr)
+%if 0%{?sle_version} != 150500 && 0%{?is_opensuse}
 BuildRequires:  mozilla-nss-devel >= 3.28.6
 PreReq:         mozilla-nss >= %(rpm -q --queryformat '%%{VERSION}' mozilla-nss)
+%endif
 
 %description
 SeaMonkey is an all-in-one Internet application suite containing a web
@@ -255,7 +257,9 @@ ac_add_options --disable-elf-hack
 ac_add_options --disable-debug
 
 ac_add_options --with-system-nspr
+%if 0%{?sle_version} != 150500 && 0%{?is_opensuse}
 ac_add_options --with-system-nss
+%endif
 ac_add_options --with-system-zlib
 ac_add_options --with-system-bz2
 %if 0%{?suse_version} > 1500 || 0%{?sle_version} >= 150200 && 0%{?is_opensuse}