diff --git a/.gitignore b/.gitignore
index ce2cef9..ca3387f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -328,3 +328,5 @@
 /firefox-langpacks-115.8.0esr-20240213.tar.xz
 /firefox-115.9.0esr.processed-source.tar.xz
 /firefox-langpacks-115.9.0esr-20240312.tar.xz
+/firefox-115.9.0esr.b2.processed-source.tar.xz
+/firefox-langpacks-115.9.0esr-20240315.tar.xz
diff --git a/firefox.spec b/firefox.spec
index d76c090..247f977 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -122,7 +122,7 @@ end}
 # If set to .b2 or .b3 ... the processed source file needs to be renamed before upload, e.g.
 # firefox-102.8.0esr.b2.processed-source.tar.xz
 # When unset use processed source file name as is.
-##global buildnum             .b2
+%global buildnum .b2
 
 %bcond_without langpacks
 
@@ -133,7 +133,7 @@ end}
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
 Version:        115.9.0
-Release:        1%{?dist}
+Release:        2%{?dist}
 URL:            https://www.mozilla.org/firefox/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 
@@ -163,7 +163,7 @@ 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}-20240312.tar.xz
+Source1:        firefox-langpacks-%{version}%{?pre_version}-20240315.tar.xz
 %endif
 Source2:        cbindgen-vendor.tar.xz
 Source3:        process-official-tarball
@@ -1742,8 +1742,12 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
+* Fri Mar 15 2024 Eike Rathke <erack@redhat.com> - 115.9.0-2
+- Update to 115.9.0 build2
+
 * Tue Mar 12 2024 Eike Rathke <erack@redhat.com> - 115.9.0-1
 - Update to 115.9.0 build1
+- Fix expat CVE-2023-52425
 
 * Tue Feb 13 2024 Eike Rathke <erack@redhat.com> - 115.8.0-1
 - Update to 115.8.0 build1
diff --git a/sources b/sources
index 373cbf9..8e6eb84 100644
--- a/sources
+++ b/sources
@@ -3,5 +3,5 @@ SHA512 (cbindgen-vendor.tar.xz) = 161811f4adfc74e5d92871c78139704d32e1e1ad6b615c
 SHA512 (nss-3.90.0-3.el8_1.src.rpm) = 81df24bd4eda4935888170e994834f4510c20fa51079631527b195b723d8f536ec4144d4a2e5d45768aeec7c426d50d70d0a294577d18233acc07c49c8af5130
 SHA512 (mochitest-python.tar.gz) = 089b1593068b76f4572af0086eaccf52a6a1299bfffb58593206d19bf021ae381f2380bbfeb4371586cd53706ff6dde3d240238b2caf19b96c57dfc2f4524e36
 SHA512 (nss-3.90.0-3.el9_0.src.rpm) = f321b9c1bda0b09eee564e2903023435851a4ff2e55bdd5b03012ca51be7999b18d85061f874065d0b25913721eb574f49746a3111f8f1cdd5b21268dddd8367
-SHA512 (firefox-115.9.0esr.processed-source.tar.xz) = 86516ebc165a9a9fc990812be861d2b896041d11318544fa353c072cbe79c42f24369b110c924ac2bd80d2b275dea6ade481b532a2b5ab90bd79c450560c033d
-SHA512 (firefox-langpacks-115.9.0esr-20240312.tar.xz) = 7e118da969adc6b845865afb4a1ce99862f586994d3f02708abcce0dc18e886aa71634fb9798e29b379c552c11fdd8fbfd7580905883ad2e88fc96615ca48e96
+SHA512 (firefox-115.9.0esr.b2.processed-source.tar.xz) = 392789a5e33baca0f3b02afca85e275cf6e12c652a8288253ee78ab88a7a92f92fb57b0b4099ce42f2a24a5f9262d6d581ec72f10d30e20d2600d2264490f4d5
+SHA512 (firefox-langpacks-115.9.0esr-20240315.tar.xz) = 1f78453caa924198bf2823d398329c17a0d56de3354a20e84f401facb154adbdfbe2f835dda1f0af166536883adaf0708868b5d5111b65dfbf75fe24438f6807