diff --git a/.gitignore b/.gitignore
index 0324a30..add0838 100644
--- a/.gitignore
+++ b/.gitignore
@@ -185,3 +185,5 @@
 /thunderbird-langpacks-140.9.0esr-20260323.tar.xz
 /thunderbird-140.9.1esr.processed-source.tar.xz
 /thunderbird-langpacks-140.9.1esr-20260409.tar.xz
+/thunderbird-140.10.0esr.processed-source.tar.xz
+/thunderbird-langpacks-140.10.0esr-20260421.tar.xz
diff --git a/sources b/sources
index 85326c5..e480d46 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-140.9.1esr.processed-source.tar.xz) = faf888d4a2654082b994b375ff65656520b813d4e6fcd04a5c863fd9d9cccddeb24e6ea7ab827eaf0611c1d9f27b50a6fa2a0f87c1550fd12c9920362910fe32
-SHA512 (thunderbird-langpacks-140.9.1esr-20260409.tar.xz) = 50ca6bb07a1e673714f272a73c3f79a941c5c951fffdb8c816ac1e16f3c44937f3bd147b7def2f1ec47985e8f100edb7ce8aa5d5e4cdf7806c7d3bc7c27b2bae
+SHA512 (thunderbird-140.10.0esr.processed-source.tar.xz) = 0f749b88f2cd8c2ede0e0622b09e8df9afb8de5bf6480bd5e5736b24763f0cfba3ea63f026c613df000e4c1b0a0395c9e8057d9d0815a4b17adaac394406f840
+SHA512 (thunderbird-langpacks-140.10.0esr-20260421.tar.xz) = 00c5582d5b2aad9c3b51026aeb1b70df80af21e1802f4e9d8a9b4a5c9f2fca8ef5c43abfd71559dc73fb783cac0f2068c444a86b6bf75b70e8e913dbfe8e1fe7
diff --git a/thunderbird.spec b/thunderbird.spec
index 3ca2297..209abc3 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -137,7 +137,7 @@ end}
 
 Summary:        Mozilla Thunderbird mail/newsgroup client
 Name:           thunderbird
-Version:        140.9.1
+Version:        140.10.0
 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}-20260409.tar.xz
+Source1:        thunderbird-langpacks-%{version}%{?pre_version}-20260421.tar.xz
 %endif
 Source2:        cbindgen-vendor.tar.xz
 Source3:        process-official-tarball
@@ -1720,6 +1720,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #===============================================================================
 
 %changelog
+* Tue Apr 21 2026 Jan Horak <jhorak@redhat.com> - 140.10.0-1
+- Update to 140.10.0 ESR
+
 * Thu Apr  9 2026 Jan Horak <jhorak@redhat.com> - 140.9.1-1
 - Update to 140.9.1 ESR