diff --git a/.gitignore b/.gitignore
index e12cfb1..a007b45 100644
--- a/.gitignore
+++ b/.gitignore
@@ -67,3 +67,5 @@ doxygen-1.7.1.src.tar.gz
 /doxygen-1.13.0.src.tar.gz
 /doxygen-1.13.1.src.tar.gz
 /doxygen-1.13.2.src.tar.gz
+/doxygen-1.14.0.src.tar.gz
+/doxygen-1.15.0.src.tar.gz
diff --git a/doxygen.spec b/doxygen.spec
index 0aee136..7818615 100644
--- a/doxygen.spec
+++ b/doxygen.spec
@@ -1,21 +1,23 @@
 %if 0%{?fedora}
 %global xapian_core_support ON
-%global clang_support OFF
 %global build_wizard ON
+%global system_spdlog ON
+%global system_fmt ON
 %else
 %global xapian_core_support OFF
-%global clang_support OFF
 %global build_wizard OFF
+%global system_spdlog OFF
+%global system_fmt OFF
 %endif
 %global build_search %{xapian_core_support}
-%global system_spdlog ON
+%global clang_support ON
 %global system_sqlite3 ON
 
 Summary: A documentation system for C/C++
 Name:    doxygen
 Epoch:   2
-Version: 1.13.2
-Release: 4%{?dist}
+Version: 1.15.0
+Release: 1%{?dist}
 # No version is specified.
 License: GPL-2.0-or-later
 Url: https://github.com/doxygen
@@ -116,10 +118,23 @@ BuildRequires: gcc-c++ gcc
 %endif
 %if "%{system_spdlog}" == "ON"
 BuildRequires: spdlog-devel
+%else
+# SPDLOG_VER* defined in deps/spdlog/include/spdlog/version.h
+Provides: bundled(spdlog) = 1.14.1
 %endif
 %if "%{system_sqlite3}" == "ON"
 BuildRequires: sqlite-devel
+%else
+# SQLITE_VERSION defined in deps/sqlite3/sqlite3.h
+Provides: bundled(sqlite) = 3.42.0
 %endif
+%if "%{system_fmt}" == "ON"
+BuildRequires: fmt-devel
+%else
+# deps/fmt/README.md
+Provides: bundled(fmt) = 10.2.1
+%endif
+
 Requires: perl-interpreter
 Requires: graphviz
 
@@ -141,7 +156,8 @@ Javascript files for use by locally installed Doxygen documentation.
 %package doxywizard
 Summary: A GUI for creating and editing configuration files
 Requires: %{name} = %{epoch}:%{version}-%{release}
-BuildRequires: qt5-qtbase-devel
+BuildRequires: qt6-qtbase-devel
+BuildRequires: qt6-qtsvg-devel
 
 %description doxywizard
 Doxywizard is a GUI for creating and editing configuration files that
@@ -227,11 +243,6 @@ Requires: texlive-epstopdf
 %prep
 %autosetup -p1 -a2
 
-# convert into utf-8
-iconv --from=ISO-8859-1 --to=UTF-8 LANGUAGE.HOWTO > LANGUAGE.HOWTO.new
-touch -r LANGUAGE.HOWTO LANGUAGE.HOWTO.new
-mv LANGUAGE.HOWTO.new LANGUAGE.HOWTO
-
 cp %{SOURCE3} .
 
 %build
@@ -246,7 +257,8 @@ cp %{SOURCE3} .
 	-DPYTHON_EXECUTABLE=%{_bindir}/python3 \
 	-Dbuild_xmlparser=ON \
 	-Duse_sys_sqlite3=%{system_sqlite3} \
-	-Duse_sys_spdlog=%{system_spdlog}
+	-Duse_sys_spdlog=%{system_spdlog} \
+	-Duse_sys_fmt=%{system_fmt}
 
 %cmake_build %{?_smp_mflags}
 
@@ -278,8 +290,8 @@ rm -f %{buildroot}/%{_mandir}/man1/doxyindexer.1* %{buildroot}/%{_mandir}/man1/d
 rm -rf %{buildroot}/%{_docdir}/packages
 
 # Install the asset files.
-install -m644 -D --target-directory=%{buildroot}%{_jsdir}/doxygen \
-  templates/html/*.js
+install -m644 -D --target-directory=%{buildroot}%{_jsdir}/doxygen templates/html/*.js
+
 # Generate the macros file.  Expand version/release/%%_jsdir.
 mkdir -p %{buildroot}%{_rpmconfigdir}/macros.d
 cat > %{buildroot}%{_rpmconfigdir}/macros.d/macros.doxygen <<'EOF'
@@ -287,7 +299,8 @@ cat > %{buildroot}%{_rpmconfigdir}/macros.d/macros.doxygen <<'EOF'
 %%doxygen_unbundle_buildroot() %%{_rpmconfigdir}/redhat/doxygen-unbundler "%{_jsdir}" "%%{buildroot}" %%[ %%# == 0 ? "%%{_docdir}" : "%%1"]
 %%doxygen_unbundle() %{_rpmconfigdir}/redhat/doxygen-unbundler "%{_jsdir}" "" %%*
 EOF
-# Install the unbundler script.
+
+ # Install the unbundler script.
 install -m755 -D --target-directory=%{buildroot}%{_rpmconfigdir}/redhat %{SOURCE4}
 
 %check
@@ -327,6 +340,24 @@ install -m755 -D --target-directory=%{buildroot}%{_rpmconfigdir}/redhat %{SOURCE
 %endif
 
 %changelog
+* Thu Nov 13 2025 Than Ngo <than@redhat.com> - 2:1.15.0-1
+- Update to 1.15.0
+
+* Wed Jul 23 2025 Fedora Release Engineering <releng@fedoraproject.org> - 2:1.14.0-4
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_43_Mass_Rebuild
+
+* Wed Jun 25 2025 Than Ngo <than@redhat.com> - 2:1.14.0-3
+- Upstream fix for input buffer overflow
+
+* Wed May 28 2025 Yaakov Selkowitz <yselkowi@redhat.com> - 2:1.14.0-2
+- Use bundled spdlog on RHEL, redux
+
+* Sun May 25 2025 Than Ngo <than@redhat.com> - 2:1.14.0-1
+- Fix rhbz#2368381, update to 1.14.0
+
+* Tue Feb 11 2025 Yaakov Selkowitz <yselkowi@redhat.com> - 2:1.13.2-5
+- Use bundled spdlog on RHEL
+
 * Mon Feb 10 2025 Than Ngo <than@redhat.com> - 2:1.13.2-4
 - built with system sqlite3 and spdlog 
 
diff --git a/sources b/sources
index 495571b..7883325 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
 SHA512 (doxywizard-icons.tar.xz) = 865a86d7535e64ad92e36ba1f901d51cd6b603e762e5c68761a45bc1f965a36e6a6c8d29468ecb2ec799f0add2347537723832aff6660c76af453f80a0a370ad
-SHA512 (doxygen-1.13.2.src.tar.gz) = 7b6b3285706e10c0b27230503b83cc669aec83ebc3ef9cc1087d5e36118fd726a5368d567dd553ba01acf4d739cdbb41c5e66af4541fc8e51effbbdaa241c812
+SHA512 (doxygen-1.15.0.src.tar.gz) = e53cc8da6cf1fe3ca3b3637647ed6afa28365351eac81d010f6691d939df5e449b3d898a6f695dd850d12659dfd7018fc864071b30fbca5dd196dc094ec4371e