diff --git a/.gitignore b/.gitignore
index c2da65c..7db0ffc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -80,3 +80,5 @@
 /nss-3.90.0-3-no-buildid.el9_0.src.rpm
 /thunderbird-115.3.0.processed-source.tar.xz
 /thunderbird-langpacks-115.3.0-20230926.tar.xz
+/thunderbird-langpacks-115.3.1-20230929.tar.xz
+/thunderbird-115.3.1.processed-source.tar.xz
diff --git a/sources b/sources
index d3bed70..59ada5e 100644
--- a/sources
+++ b/sources
@@ -2,5 +2,5 @@ SHA512 (cbindgen-vendor.tar.xz) = 161811f4adfc74e5d92871c78139704d32e1e1ad6b615c
 SHA512 (nspr-4.35.0-1.el8_1.src.rpm) = 5123a443fcc42602e31104999be339ae899eb7b1f1e2f1ea87ba4f283eb894d08ab568e421dba1df4770f23be91ff88aa6a0748bce7feef31ed88bee5bdecb2c
 SHA512 (nss-3.90.0-2.el8_1.src.rpm) = 850cd6a343e62d34ad28ac356db03371f0b1f018274901cc700cc4f8138c9929eb159bbb1ebe167f727a69f6499423a54581ca65ed655ee468f1cae8450df85c
 SHA512 (nss-3.90.0-3.el9_0.src.rpm) = f321b9c1bda0b09eee564e2903023435851a4ff2e55bdd5b03012ca51be7999b18d85061f874065d0b25913721eb574f49746a3111f8f1cdd5b21268dddd8367
-SHA512 (thunderbird-115.3.0.processed-source.tar.xz) = 6c581b9be7583c9fbf368e1e9027db14d76cc37a7245bf10394b710ab21d0ca5ad072ca521bdfb023f78a8c8b0980462205f56688b7e15e71a2b08fb6cdf0e52
-SHA512 (thunderbird-langpacks-115.3.0-20230926.tar.xz) = d06c045ae250d602e1bfa88b3cf34f512d3ae52bdeff9102e2938c088252829441e012437051bc9db18d64d639af5281e258284f2f1aa341634f1113b95936a5
+SHA512 (thunderbird-langpacks-115.3.1-20230929.tar.xz) = c979cb9f42debe3c3b2950c765ee22669781033764607f8ddfb7f5e089302dec7d23fc0d1cb4a60c40fd765ddbf1000cd365b2a92d5df0ce659660f2a599d85d
+SHA512 (thunderbird-115.3.1.processed-source.tar.xz) = bab3b406863d0ee99ddeb96aff1ad75c9563cd1d284daa0a03a49c48ac9885e56b3f51f78f539348ddf12e0246d28ff44a154707b33b5fc74df16eec257ccd2e
diff --git a/thunderbird.spec b/thunderbird.spec
index fec9ebe..f048217 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -134,7 +134,7 @@ end}
 
 Summary:        Mozilla Thunderbird mail/newsgroup client
 Name:           thunderbird
-Version:        115.3.0
+Version:        115.3.1
 Release:        1%{?dist}
 URL:            http://www.mozilla.org/projects/thunderbird/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
@@ -160,7 +160,7 @@ ExcludeArch:    aarch64 s390 ppc
 #Source0:        https://archive.mozilla.org/pub/thunderbird/releases/%%{version}%%{?pre_version}/source/thunderbird-%%{version}%%{?pre_version}.processed-source.tar.xz
 Source0:        thunderbird-%{version}%{?pre_version}%{?buildnum}.processed-source.tar.xz
 %if %{with langpacks}
-Source1:        thunderbird-langpacks-%{version}-20230926.tar.xz
+Source1:        thunderbird-langpacks-%{version}-20230929.tar.xz
 %endif
 Source2:        cbindgen-vendor.tar.xz
 Source3:        process-official-tarball
@@ -1494,6 +1494,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #===============================================================================
 
 %changelog
+* Fri Sep 29 2023 Eike Rathke <erack@redhat.com> - 115.3.1-1
+- Update to 115.3.1 build1
+
 * Wed Sep 27 2023 Eike Rathke <erack@redhat.com> - 115.3.0-1
 - Update to 115.3.0