diff --git a/.gitignore b/.gitignore
index ba6de04..a74d620 100644
--- a/.gitignore
+++ b/.gitignore
@@ -191,3 +191,5 @@
 /thunderbird-langpacks-140.10.1esr-20260511.tar.xz
 /thunderbird-140.11.0esr.processed-source.tar.xz
 /thunderbird-langpacks-140.11.0esr-20260521.tar.xz
+/thunderbird-140.12.0esr.processed-source.tar.xz
+/thunderbird-langpacks-140.12.0esr-20260615.tar.xz
diff --git a/sources b/sources
index b06ce15..6425252 100644
--- a/sources
+++ b/sources
@@ -2,5 +2,5 @@ SHA512 (nss-3.112.0-1.el9_4.src.rpm) = 6386239e79f8095b05270b3c8b76ac9203b0df196
 SHA512 (cbindgen-vendor.tar.xz) = 2b8db32c0bca2fa27304ee4fd3a5cc38bc43a11500b23842747813d221e55719c51cf4c0e027e41857f58ce1e283ce97b69c2c7d1eae93ecbb08c2f729e2bf55
 SHA512 (nss-3.112.0-4.el8_2.src.rpm) = 59cca3df7a0ec6a731f4a36f8f560d496d240da0c16650f047ae686e683b883dc2630aedbe46a8b2cb21662c15f03f1efbe99da42055cc3a5418da4839e28da2
 SHA512 (nspr-4.36.0-2.el8_2.src.rpm) = fcc720afd2453a5110975fac9dd06f636491234780b62cbfcc235a485b4935e97c4f438292c686d27d9dc86b56f43399c024bee4fffcdff5f27c62d105310645
-SHA512 (thunderbird-140.11.0esr.processed-source.tar.xz) = ae1121171fea4435d718a5a08e09b0ca78277aa57bf31b29ee77d76fc64cb9db624061b8b6f58bb94aa598dcef8ba60c260bed326c680d8f6bea5a42468175a4
-SHA512 (thunderbird-langpacks-140.11.0esr-20260521.tar.xz) = 3a128bcdbc9258cfc43281b8d2b6f7be4c440d64b361ee74429e4812ab5d40e6047942bb35cb464579c86b583e203e417b927f74cd2a609270b68ddc8cd07229
+SHA512 (thunderbird-140.12.0esr.processed-source.tar.xz) = bb9133765193bdda4c8e59e0c6adb984b131536d30e523e163de264086d5dcdbe1a2138de1e549268e972aeda00b01dcd0edaa70c2490706bc34c934d39988f8
+SHA512 (thunderbird-langpacks-140.12.0esr-20260615.tar.xz) = bdf1f9810a488a050c7decd093dd0e7299166d1d8fdb4db73ff4a983c9182acf6e9a7cf12df07c206b542663b7e9c20c8078ab2e649c561cd981ab6b7038868c
diff --git a/thunderbird.spec b/thunderbird.spec
index 1ddc278..e547ba7 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -137,7 +137,7 @@ end}
 
 Summary:        Mozilla Thunderbird mail/newsgroup client
 Name:           thunderbird
-Version:        140.11.0
+Version:        140.12.0
 Release:        1%{?dist}
 URL:            http://www.mozilla.org/projects/thunderbird/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
@@ -165,7 +165,7 @@ ExcludeArch:    %{ix86}
 #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}%{?pre_version}-20260521.tar.xz
+Source1:        thunderbird-langpacks-%{version}%{?pre_version}-20260615.tar.xz
 %endif
 Source2:        cbindgen-vendor.tar.xz
 Source3:        process-official-tarball
@@ -1723,6 +1723,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #===============================================================================
 
 %changelog
+* Mon Jun 15 2026 Jan Horak <jhorak@redhat.com> - 140.12.0-1
+- Update to 140.12.0 ESR
+
 * Thu May 21 2026 Jan Horak <jhorak@redhat.com> - 140.11.0-1
 - Update to 140.11.0 ESR