diff --git a/.gitignore b/.gitignore
index 6dd6f65..db91bc0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,4 +17,3 @@
 # Most recent upstrem source
 /CppAD-20240000.3.tar.gz
 /CppAD-20250000.0.tar.gz
-/CppAD-20260000.0.tar.gz
diff --git a/cppad.spec b/cppad.spec
index b3b1612..5fa54b6 100644
--- a/cppad.spec
+++ b/cppad.spec
@@ -12,7 +12,7 @@
 #
 # year 
 # The year corresponding to this version
-%define year 2026
+%define year 2025
 #
 # soversion
 # fedora uses its own soversion number for cppad_lib where
@@ -29,7 +29,7 @@
 # https://docs.fedoraproject.org/en-US/packaging-guidelines/Versioning/
 Name:    cppad
 Version: %{year}0000.0
-Release: 1%{?dist}
+Release: 4%{?dist}
 Summary: C++ Algorithmic Differentiation (AD), %{name}-devel and %{name}-doc
 #
 License: EPL-2.0 OR GPL-2.0-or-later
@@ -38,7 +38,7 @@ Source:  %{url}/archive/%{version}/CppAD-%{version}.tar.gz
 #
 BuildRequires: gcc
 BuildRequires: gcc-c++
-BuildRequires: cmake >= 3.10
+BuildRequires: cmake >= 3.0
 BuildRequires: make
 BuildRequires: python-xrst >= 2025.0
 BuildRequires: python-sphinx_rtd_theme
@@ -81,6 +81,11 @@ The documentation for the most recent version of %{name} can be found at
 # changed into that directory and unpack Source.
 %setup -q -c
 #
+# atomic_op.hpp
+# Fix warning. This should not be necessary when version > 20250000.0
+sed -i CppAD-%{version}/include/cppad/local/var_op/atomic_op.hpp \
+   -e 's|arg_tmp\[1\];|*arg_tmp = { 0 };|'
+#
 # xrst.toml
 # This is not a git repository so suppress the warning that could not double
 # check that all the files with xrst commands were included.
@@ -92,6 +97,38 @@ echo 'data = [ ]'         >> CppAD-%{version}/xrst.toml
 cp CppAD-%{version}/COPYING  COPYING
 cp CppAD-%{version}/uw_copy_040507.html uw_copy_040507.html
 #
+# fix bug
+# should not be needed once version > 20250000.0
+cat << EOF > temp.sed
+/setup_random(size_t& not_used)/! b end
+: loop
+N
+/\\n *}/! b loop
+s|^|# if ! CPPAD_IS_SAME_UNSIGNED_INT_SIZE_T\\n|
+s|$|\\n# endif|
+#
+: end
+EOF
+sed -i.bak CppAD-%{version}/include/cppad/local/play/player.hpp -f temp.sed
+#
+# fix bug
+# should not be needed once version > 20250000.0
+cat << EOF > temp.sed
+/CHECK_CXX_SOURCE_COMPILES/! b end
+s|^|   SET(CMAKE_REQUIRED_DEFINITIONS "" )\\
+   SET(CMAKE_REQUIRED_INCLUDES    "" )\\
+   SET(CMAKE_REQUIRED_LIBRARIES   "" )\\
+   IF( cppad_cxx_flags )\\
+      SET(CMAKE_REQUIRED_FLAGS   "\${cppad_cxx_flags} \${CMAKE_CXX_FLAGS}" )\\
+   ELSE( cppad_cxx_flags )\\
+      SET(CMAKE_REQUIRED_FLAGS   "" )\\
+   ENDIF( cppad_cxx_flags )\\
+|
+#
+: end
+EOF
+sed -i.bak CppAD-%{version}/cmake/compile_source_test.cmake -f temp.sed
+#
 # cppad_lib/CMakeLists.txt
 # cppad_lib: replace soversion number and ensure build type is release 
 sed -i.bak CppAD-%{version}/cppad_lib/CMakeLists.txt \
@@ -232,12 +269,6 @@ make %{?_smp_mflags} check
 %%clean
 # ----------------------------------------------------------------------------
 %changelog
-* Mon Jan 05 2026 Brad Bell <bradbell at seanet dot com> - 20260000.0-1
-- New upstream source cppad-20260000.0.
-
-* Wed Jul 23 2025 Fedora Release Engineering <releng@fedoraproject.org> - 20250000.0-5
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_43_Mass_Rebuild
-
 * Wed Feb 05 2025  <bradbell at seanet dot com> - 20250000.0-4
 - python-toml is deprecated, so current xrst-python uses python-tomli instead
 
diff --git a/sources b/sources
index 8f40433..1f290de 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (CppAD-20260000.0.tar.gz) = abe9dd9a971f8d154990d54c1f798c8cab6bf90d016bb288efbcb23a14331897762610295658eec04fb50e5c13b05f4bb6b50a4647d6f0468eb94833dc3400d2
+SHA512 (CppAD-20250000.0.tar.gz) = 05bb5a77e56f53f89f3e403943e64521bfd8e148ed142d9ce3ee695e10574567befce76cf31819fe1f580e45e9d11db0477388e18b78e410ca7ea528b04ec282