diff --git a/.gitignore b/.gitignore
index 6d84b01..0ee3492 100644
--- a/.gitignore
+++ b/.gitignore
@@ -144,3 +144,5 @@ SOURCES/nss-3.79.0-6.el8_1.src.rpm
 /firefox-langpacks-140.10.2esr-20260514.tar.xz
 /firefox-140.11.0esr.processed-source.tar.xz
 /firefox-langpacks-140.11.0esr-20260520.tar.xz
+/firefox-140.12.0esr.processed-source.tar.xz
+/firefox-langpacks-140.12.0esr-20260610.tar.xz
diff --git a/firefox.spec b/firefox.spec
index e97f66e..1ca5fcc 100644
--- a/firefox.spec
+++ b/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
 
diff --git a/sources b/sources
index eb87d15..f8a34d5 100644
--- a/sources
+++ b/sources
@@ -4,5 +4,5 @@ SHA512 (cbindgen-vendor.tar.xz) = 2b8db32c0bca2fa27304ee4fd3a5cc38bc43a11500b238
 SHA512 (nss-3.112.0-1.el9_4.src.rpm) = 6386239e79f8095b05270b3c8b76ac9203b0df196921b64b779f832f0c04fc8c86624a98d85d39372b07e361278c400f52ef653e14ebeab9db49429e69153ff2
 SHA512 (nss-3.112.0-4.el8_2.src.rpm) = 59cca3df7a0ec6a731f4a36f8f560d496d240da0c16650f047ae686e683b883dc2630aedbe46a8b2cb21662c15f03f1efbe99da42055cc3a5418da4839e28da2
 SHA512 (nspr-4.36.0-2.el8_2.src.rpm) = fcc720afd2453a5110975fac9dd06f636491234780b62cbfcc235a485b4935e97c4f438292c686d27d9dc86b56f43399c024bee4fffcdff5f27c62d105310645
-SHA512 (firefox-140.11.0esr.processed-source.tar.xz) = 1bb25fb6f35c3c24d69ae0574fb79b7b02688863814dadc6d34314290c4240bf47ed20f80b92a43466635b15a0c95a7ba98d621710c5ba04e40e72f3946d12ce
-SHA512 (firefox-langpacks-140.11.0esr-20260520.tar.xz) = a8609b2b99518a7af27171c33eba5bcd130883f29c977235e3d9777ffdc91cb0b60eb3f3770766d468790c9597af5d0d493f3f8fc2e76121d0d0580ed16094ff
+SHA512 (firefox-140.12.0esr.processed-source.tar.xz) = d73dbba79f02297a39f15a7d9d40cf7d70c8e39485bc76663365f022567b0810550d77da24934edc8131189080434f23d73ab6da29bb8edb3a199fe07dc55952
+SHA512 (firefox-langpacks-140.12.0esr-20260610.tar.xz) = 157cd7823cac383dc7d4dd7a92e337270aeb4758a6e818270ef7bcd6b12809f5b0d2e5c820958fa649fa0e20c56162bbff5c5326ea2a7739da6e3ac0072bfa9b