diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000000000000000000000000000000000000..0a80fdce31f59c062e2abba28776e9521eddff30
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+*.gz filter=lfs diff=lfs merge=lfs -text
diff --git a/.lfsconfig b/.lfsconfig
new file mode 100644
index 0000000000000000000000000000000000000000..a6739c0c43e333e7bce639679ac39a70314e4dcc
--- /dev/null
+++ b/.lfsconfig
@@ -0,0 +1,2 @@
+[lfs]
+	url = https://artlfs.openeuler.openatom.cn/src-openEuler/double-conversion
diff --git a/double-conversion-3.1.5.tar.gz b/double-conversion-3.1.5.tar.gz
deleted file mode 100644
index d1ee77e889d1d198035ca97e18cced6257de643b..0000000000000000000000000000000000000000
Binary files a/double-conversion-3.1.5.tar.gz and /dev/null differ
diff --git a/double-conversion-3.1.5-add-loongarch-support.patch b/double-conversion-3.3.0-add-loongarch-support.patch
similarity index 78%
rename from double-conversion-3.1.5-add-loongarch-support.patch
rename to double-conversion-3.3.0-add-loongarch-support.patch
index 3f72089243c63768e0a8209ae698733c4a037da1..b854951c04630404a78f70656e116eb6a7861b3e 100644
--- a/double-conversion-3.1.5-add-loongarch-support.patch
+++ b/double-conversion-3.3.0-add-loongarch-support.patch
@@ -12,13 +12,13 @@ diff --git a/double-conversion/utils.h b/double-conversion/utils.h
 index 4328344..72f1df8 100644
 --- a/double-conversion/utils.h
 +++ b/double-conversion/utils.h
-@@ -93,6 +93,7 @@ int main(int argc, char** argv) {
+@@ -138,6 +138,7 @@
  #if defined(_M_X64) || defined(__x86_64__) || \
      defined(__ARMEL__) || defined(__avr32__) || defined(_M_ARM) || defined(_M_ARM64) || \
      defined(__hppa__) || defined(__ia64__) || \
 +    defined(__loongarch64) || \
      defined(__mips__) || \
-     defined(__powerpc__) || defined(__ppc__) || defined(__ppc64__) || \
-     defined(_POWER) || defined(_ARCH_PPC) || defined(_ARCH_PPC64) || \
+     defined(__loongarch__) || \
+     defined(__nios2__) || defined(__ghs) || \
 -- 
 2.30.0
diff --git a/double-conversion-3.3.1-port-to-newer-cmake.patch b/double-conversion-3.3.1-port-to-newer-cmake.patch
new file mode 100644
index 0000000000000000000000000000000000000000..a2f1ac01a45e0722c0a466fdf04f687f1ef5c4e1
--- /dev/null
+++ b/double-conversion-3.3.1-port-to-newer-cmake.patch
@@ -0,0 +1,8 @@
+--- double-conversion-3.3.1/CMakeLists.txt.orig	2025-03-02 19:12:35.414837400 +0800
++++ double-conversion-3.3.1/CMakeLists.txt	2025-03-02 19:12:45.972416200 +0800
+@@ -1,4 +1,4 @@
+-cmake_minimum_required(VERSION 3.0)
++cmake_minimum_required(VERSION 3.0...${CMAKE_VERSION})
+ project(double-conversion VERSION 3.3.0)
+ 
+ option(BUILD_SHARED_LIBS "Build shared libraries (.dll/.so) instead of static ones (.lib/.a)" OFF)
diff --git a/double-conversion-3.3.1.tar.gz b/double-conversion-3.3.1.tar.gz
new file mode 100644
index 0000000000000000000000000000000000000000..4270214792a056ef6e4caa58446660e691df3789
--- /dev/null
+++ b/double-conversion-3.3.1.tar.gz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:fe54901055c71302dcdc5c3ccbe265a6c191978f3761ce1414d0895d6b0ea90e
+size 7035094
diff --git a/double-conversion.spec b/double-conversion.spec
index 46dae829b8ad1ec4c78529c65cbffaf0045247b5..2b9218943132dc26ad6e0b715bd6d0952b233184 100644
--- a/double-conversion.spec
+++ b/double-conversion.spec
@@ -1,12 +1,13 @@
 Summary:        Library providing binary-decimal and decimal-binary routines for IEEE doubles
 Name:           double-conversion
-Version:        3.1.5
-Release:        3
+Version:        3.3.1
+Release:        1
 License:        BSD-3-Clause
 URL:            https://github.com/google/double-conversion
 Source0:        https://github.com/google/double-conversion/archive/v%{version}/%{name}-%{version}.tar.gz
 BuildRequires:  gcc gcc-c++ cmake
-Patch1:         double-conversion-3.1.5-add-loongarch-support.patch
+Patch1:         double-conversion-3.3.0-add-loongarch-support.patch
+Patch2:         double-conversion-3.3.1-port-to-newer-cmake.patch
 
 %description
 Provides binary-decimal and decimal-binary routines for IEEE doubles.
@@ -36,7 +37,7 @@ Static %{name} library.
 %autosetup -n %{name}-%{version} -p1
 
 %build
-%cmake -DBUILD_TESTING=ON ..
+%cmake -DBUILD_TESTING=ON
 %cmake_build
 
 %install
@@ -56,6 +57,9 @@ Static %{name} library.
 %{_includedir}/%{name}
 
 %changelog
+* Sat Feb 15 2025 Funda Wang <fundawang@yeah.net> - 3.3.1-1
+- update to 3.3.1
+
 * Mon Nov 18 2024 Funda Wang <fundawang@yeah.net> - 3.1.5-3
 - adopt to new cmake macro
 - drop static build completely