diff --git a/dist b/dist
index 5aa45c5bf3f5e5b781981aec176b4910ac39baaf..37a6f9cba7a88cbcf8ab13c9187a23e686af9edd 100644
--- a/dist
+++ b/dist
@@ -1 +1 @@
-an8_8
+an8_9
diff --git a/download b/download
index 8a9b24484e9a20e10c72de98001def5d4e3b23eb..ec87af631fc640e600783e6939aa5f73189a32e5 100644
--- a/download
+++ b/download
@@ -1,6 +1,6 @@
 9b999bdcf031e29a4d8ce2b6f17e778e  cbindgen-vendor.tar.xz
-26a6d8a9440ba4d7d5e5c85b7453022a  firefox-115.5.0esr.processed-source.tar.xz
-5dd9d96d19ff3368ab18f3a1ef42bc41  firefox-langpacks-115.5.0esr-20231114.tar.xz
+7e519b6d9819c53960892ab30e8ca081  firefox-115.6.0esr.processed-source.tar.xz
+19b95bbe91322258960571ba2ff13ff9  firefox-langpacks-115.6.0esr-20231212.tar.xz
 b3c1d2ea615cb0195f4f62b005773262  mochitest-python.tar.gz
 7b35b9a003996b1f1dbc3cd936a609f2  nspr-4.35.0-1.el8_1.src.rpm
 3fdd30cefe44a98c424cb3aeca73f2b3  nss-3.90.0-3.el8_1.src.rpm
diff --git a/firefox.spec b/firefox.spec
index ff876f34959c12ea6c5d986340ffe3b599dc7d7f..1167c4cce4890ff1ecc48826a8949e05cafe3023 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -133,7 +133,7 @@ end}
 
 Summary:              Mozilla Firefox Web browser
 Name:                 firefox
-Version:              115.5.0
+Version:              115.6.0
 Release:              1%{anolis_release}%{?dist}
 URL:                  https://www.mozilla.org/firefox/
 License:              MPLv1.1 or GPLv2+ or LGPLv2+
@@ -166,7 +166,7 @@ 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}-20231114.tar.xz
+Source1:              firefox-langpacks-%{version}%{?pre_version}-20231212.tar.xz
 %endif
 Source2:              cbindgen-vendor.tar.xz
 Source3:              process-official-tarball
@@ -313,7 +313,7 @@ BuildRequires:        rust >= %{rust_version}
 
 %if 0%{?rhel} == 9
 BuildRequires:        cargo
-BuildRequires:        clang clang-libs llvm
+BuildRequires:        clang clang-libs llvm llvm-devel
 BuildRequires:        gcc
 BuildRequires:        gcc-c++
 BuildRequires:        python3-devel
@@ -1125,8 +1125,8 @@ echo "ac_add_options --with-google-location-service-api-keyfile=`pwd`/google-loc
 echo "ac_add_options --with-google-safebrowsing-api-keyfile=`pwd`/google-api-key" >> .mozconfig
 
 # May result in empty --with-libclang-path= in earlier versions.
-# So far this is needed only for c8s.
-%if 0%{?rhel} == 8 && %{rhel_minor_version} >= 10
+# So far this is needed only for c8s/c9s.
+%if (0%{?rhel} == 8 && %{rhel_minor_version} >= 10) || (0%{?rhel} == 9 && %{rhel_minor_version} >= 4)
 # Clang 17 upstream's detection fails, tell it where to look.
 echo "ac_add_options --with-libclang-path=`llvm-config --libdir`" >> .mozconfig
 %endif
@@ -1742,10 +1742,13 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
-* Fri Dec 01 2023 Liwei Ge <geliwei@openanolis.org> - 115.5.0-1.0.1
+* Wed Jan 03 2024 Liwei Ge <geliwei@openanolis.org> - 115.6.0-1.0.1
 - Add firefox-anolis-default-prefs.js
 - Remove bookmarks and loongarch64
 
+* Tue Dec 12 2023 Eike Rathke <erack@redhat.com> - 115.6.0-1
+- Update to 115.6.0 build1
+
 * Tue Nov 14 2023 Eike Rathke <erack@redhat.com> - 115.5.0-1
 - Update to 115.5.0 build1