diff --git a/.gitignore b/.gitignore
index 186452d..83e38bb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -311,3 +311,6 @@
 /firefox-115.2.0esr.processed-source.tar.xz
 /mochitest-python.tar.gz
 /nss-3.90.0-3.el9_0.src.rpm
+/firefox-115.3.0esr.source.tar.xz
+/firefox-langpacks-115.3.0esr-20230921.tar.xz
+/firefox-115.3.0esr.processed-source.tar.xz
diff --git a/firefox.spec b/firefox.spec
index 5a89210..f414506 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -131,8 +131,8 @@ end}
 
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
-Version:        115.2.0
-Release:        3%{?dist}
+Version:        115.3.0
+Release:        1%{?dist}
 URL:            https://www.mozilla.org/firefox/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 
@@ -157,7 +157,7 @@ ExcludeArch:    aarch64 s390 ppc
 # Link to original tarball: https://archive.mozilla.org/pub/firefox/releases/%%{version}%%{?pre_version}/source/firefox-%%{version}%%{?pre_version}.source.tar.xz
 Source0:        firefox-%{version}%{?pre_version}%{?buildnum}.processed-source.tar.xz
 %if %{with langpacks}
-Source1:        firefox-langpacks-%{version}%{?pre_version}-20230904.tar.xz
+Source1:        firefox-langpacks-%{version}%{?pre_version}-20230921.tar.xz
 %endif
 Source2:        cbindgen-vendor.tar.xz
 Source3:        process-official-tarball
@@ -1717,6 +1717,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
+* Thu Sep 21 2023 Jan Horak <jhorak@redhat.com> - 115.3.0-1
+- Update to 115.3.0 ESR
+
 * Mon Sep  4 2023 Jan Horak <jhorak@redhat.com> - 115.2.0-3
 - Update to 115.2.0 ESR
 
diff --git a/sources b/sources
index 807f63b..7b26527 100644
--- a/sources
+++ b/sources
@@ -1,7 +1,7 @@
 SHA512 (nspr-4.35.0-1.el8_1.src.rpm) = 5123a443fcc42602e31104999be339ae899eb7b1f1e2f1ea87ba4f283eb894d08ab568e421dba1df4770f23be91ff88aa6a0748bce7feef31ed88bee5bdecb2c
 SHA512 (cbindgen-vendor.tar.xz) = 161811f4adfc74e5d92871c78139704d32e1e1ad6b615c85353de300d9647a68f1ca8b1c953f7cc5539d861e9e8d8e42892cae757a3eafea78804e19bc323c16
 SHA512 (nss-3.90.0-3.el8_1.src.rpm) = 81df24bd4eda4935888170e994834f4510c20fa51079631527b195b723d8f536ec4144d4a2e5d45768aeec7c426d50d70d0a294577d18233acc07c49c8af5130
-SHA512 (firefox-langpacks-115.2.0esr-20230904.tar.xz) = f86405fb0fdaf3d1e9c46c6ccadc06d049671e0ab85f89071455af0b7d959b4bcfee85beddc933d8fbb2d45c333f0352149ebb4f1a8ccf7d390064a78bdd3f40
-SHA512 (firefox-115.2.0esr.processed-source.tar.xz) = 8a63e72c377535560bc9199c2acbbffba835b723a113e08cd302a99985ebb3cc701aff313e94123de70cebed5288265ec2093728ebe72bdc2f7886a944796750
 SHA512 (mochitest-python.tar.gz) = 089b1593068b76f4572af0086eaccf52a6a1299bfffb58593206d19bf021ae381f2380bbfeb4371586cd53706ff6dde3d240238b2caf19b96c57dfc2f4524e36
 SHA512 (nss-3.90.0-3.el9_0.src.rpm) = f321b9c1bda0b09eee564e2903023435851a4ff2e55bdd5b03012ca51be7999b18d85061f874065d0b25913721eb574f49746a3111f8f1cdd5b21268dddd8367
+SHA512 (firefox-langpacks-115.3.0esr-20230921.tar.xz) = ab2377e6924b736ba68b3a1b9122dbf5639765ccc3050a24fcc2ba7f993b0f2d87a8874e4d68d71210996b1353be0407bbb10dda5b9b3aadbae8455141dc3326
+SHA512 (firefox-115.3.0esr.processed-source.tar.xz) = f0d60534f9cc18a1ad5c1b877c2f02b494d65f9a824abaeed51dfcb2c610ffaecbf8905fae2c191525cdccdf38b563b95930986b58e212ed0e0f11b96dab012f