diff --git a/.firefox.metadata b/.firefox.metadata
index 708ce31..172fa4d 100644
--- a/.firefox.metadata
+++ b/.firefox.metadata
@@ -1,6 +1,6 @@
 bc4adac8f38f5103d8f88564a1545063dd8d6402 SOURCES/cbindgen-vendor.tar.xz
-9ab7be74cea45d63a3efc7cc2df7d5233943102a SOURCES/firefox-140.11.0esr.processed-source.tar.xz
-a0a5406ebeea012175065d83a83ec4e1bbf28ecf SOURCES/firefox-langpacks-140.11.0esr-20260520.tar.xz
+1fce35ac6944bac98b8f11370f995a4c3bfb1d28 SOURCES/firefox-140.12.0esr.processed-source.tar.xz
+d14ae6ab1061ebd7cf182df4f4c6dce951b8b60f SOURCES/firefox-langpacks-140.12.0esr-20260610.tar.xz
 2d8a6b2b30d5496735f49ffe8c8a7ede3a78a5ca SOURCES/mochitest-python.tar.gz
 0d0ddbd2a73340b3cbc977997f57222946b1e775 SOURCES/nspr-4.36.0-2.el8_2.src.rpm
 fd3879b176634d66f8ef64d18fdaeec98e140c23 SOURCES/nss-3.112.0-1.el9_4.src.rpm
diff --git a/.gitignore b/.gitignore
index 47e52bf..b588508 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
 SOURCES/cbindgen-vendor.tar.xz
-SOURCES/firefox-140.11.0esr.processed-source.tar.xz
-SOURCES/firefox-langpacks-140.11.0esr-20260520.tar.xz
+SOURCES/firefox-140.12.0esr.processed-source.tar.xz
+SOURCES/firefox-langpacks-140.12.0esr-20260610.tar.xz
 SOURCES/mochitest-python.tar.gz
 SOURCES/nspr-4.36.0-2.el8_2.src.rpm
 SOURCES/nss-3.112.0-1.el9_4.src.rpm
diff --git a/SPECS/firefox.spec b/SPECS/firefox.spec
index e97f66e..1ca5fcc 100644
--- a/SPECS/firefox.spec
+++ b/SPECS/firefox.spec
@@ -195,7 +195,7 @@ end}
 
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
-Version:        140.11.0
+Version:        140.12.0
 Release:        1%{?dist}
 URL:            https://www.mozilla.org/firefox/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
@@ -226,7 +226,7 @@ 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}-20260520.tar.xz
+Source1:        firefox-langpacks-%{version}%{?pre_version}-20260610.tar.xz
 %endif
 Source2:        cbindgen-vendor.tar.xz
 Source3:        process-official-tarball
@@ -2148,6 +2148,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
+* Wed Jun 10 2026 Jan Horak <jhorak@redhat.com> - 140.12.0-1
+- Update to 140.12.0 ESR
+
 * Wed May 20 2026 Jan Horak <jhorak@redhat.com> - 140.11.0-1
 - Update to 140.11.0 ESR