diff --git a/pkgs/development/libraries/cxxopts/default.nix b/pkgs/development/libraries/cxxopts/default.nix
index a24127ab56d..e4d1df23b7e 100644
--- a/pkgs/development/libraries/cxxopts/default.nix
+++ b/pkgs/development/libraries/cxxopts/default.nix
@@ -9,18 +9,15 @@
 
 stdenv.mkDerivation rec {
   pname = "cxxopts";
-  version = "3.0.0";
+  version = "3.1.1";
 
   src = fetchFromGitHub {
     owner = "jarro2783";
     repo = "cxxopts";
     rev = "v${version}";
-    sha256 = "08x7j168l1xwj0r3rv89cgghmfhsx98lpq35r3vkh504m1pd55a6";
+    sha256 = "sha256-lJPMaXBfrCeUhhXha5f7zmOGtyEDzU3oPTMirPTFZzQ=";
   };
 
-  # CMake does not set CMAKE_LIBRARY_ARCHITECTURE variable in Nix, which breaks architecture-independent library path generation
-  patches = [ ./fix-install-path.patch ];
-
   buildInputs = lib.optionals enableUnicodeHelp [ icu.dev ];
   cmakeFlags = [ "-DCXXOPTS_BUILD_EXAMPLES=OFF" ]
     ++ lib.optional enableUnicodeHelp "-DCXXOPTS_USE_UNICODE_HELP=TRUE";
diff --git a/pkgs/development/libraries/cxxopts/fix-install-path.patch b/pkgs/development/libraries/cxxopts/fix-install-path.patch
deleted file mode 100644
index d91e3fb6dc1..00000000000
--- a/pkgs/development/libraries/cxxopts/fix-install-path.patch
+++ /dev/null
@@ -1,18 +0,0 @@
-diff --git a/cmake/cxxopts.cmake b/cmake/cxxopts.cmake
-index 46e87ba..0ead543 100644
---- a/cmake/cxxopts.cmake
-+++ b/cmake/cxxopts.cmake
-@@ -87,7 +87,12 @@ endfunction()
- 
- # Helper function to ecapsulate install logic
- function(cxxopts_install_logic)
--    string(REPLACE "/${CMAKE_LIBRARY_ARCHITECTURE}" "" CMAKE_INSTALL_LIBDIR_ARCHIND "${CMAKE_INSTALL_LIBDIR}")
-+    if(CMAKE_LIBRARY_ARCHITECTURE)
-+        string(REPLACE "/${CMAKE_LIBRARY_ARCHITECTURE}" "" CMAKE_INSTALL_LIBDIR_ARCHIND "${CMAKE_INSTALL_LIBDIR}")
-+    else()
-+        # On some systems (e.g. NixOS), `CMAKE_LIBRARY_ARCHITECTURE` can be empty
-+        set(CMAKE_INSTALL_LIBDIR_ARCHIND "${CMAKE_INSTALL_LIBDIR}")
-+    endif()
-     set(CXXOPTS_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR_ARCHIND}/cmake/cxxopts" CACHE STRING "Installation directory for cmake files, relative to ${CMAKE_INSTALL_PREFIX}.")
-     set(version_config "${PROJECT_BINARY_DIR}/cxxopts-config-version.cmake")
-     set(project_config "${PROJECT_BINARY_DIR}/cxxopts-config.cmake")
diff --git a/pkgs/development/python-modules/chiapos/default.nix b/pkgs/development/python-modules/chiapos/default.nix
index ea7aa3b0ff5..501a8f543b2 100644
--- a/pkgs/development/python-modules/chiapos/default.nix
+++ b/pkgs/development/python-modules/chiapos/default.nix
@@ -43,6 +43,11 @@ buildPythonPackage rec {
     pytestCheckHook
   ];
 
+  # A fix for cxxopts >=3.1
+  postPatch = ''
+    substituteInPlace src/cli.cpp \
+      --replace "cxxopts::OptionException" "cxxopts::exceptions::exception"
+  '';
 
   # CMake needs to be run by setuptools rather than by its hook
   dontConfigure = true;