diff --git a/pkgs/by-name/bi/biboumi/catch.patch b/pkgs/by-name/bi/biboumi/catch.patch
deleted file mode 100644
index bbd0a66909fe..000000000000
--- a/pkgs/by-name/bi/biboumi/catch.patch
+++ /dev/null
@@ -1,30 +0,0 @@
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -303,27 +303,6 @@
- endforeach()
- 
- #
--## Add a rule to download the catch unit test framework
--#
--include(ExternalProject)
--ExternalProject_Add(catch
--  GIT_REPOSITORY "https://lab.louiz.org/louiz/Catch.git"
--  PREFIX "external"
--  UPDATE_COMMAND ""
--  CONFIGURE_COMMAND ""
--  BUILD_COMMAND ""
--  INSTALL_COMMAND ""
--  )
--set_target_properties(catch PROPERTIES EXCLUDE_FROM_ALL TRUE)
--ExternalProject_Get_Property(catch SOURCE_DIR)
--if(NOT EXISTS ${CMAKE_SOURCE_DIR}/tests/catch.hpp)
--  target_include_directories(test_suite
--    PUBLIC "${SOURCE_DIR}/single_include/"
--    )
--  add_dependencies(test_suite catch)
--endif()
--
--#
- ## Add some custom rules to launch the tests
- #
- add_custom_target(check COMMAND "test_suite"
diff --git a/pkgs/by-name/bi/biboumi/package.nix b/pkgs/by-name/bi/biboumi/package.nix
index ebc9dfa625e3..ccf3d25dd507 100644
--- a/pkgs/by-name/bi/biboumi/package.nix
+++ b/pkgs/by-name/bi/biboumi/package.nix
@@ -2,7 +2,6 @@
   lib,
   stdenv,
   fetchFromGitea,
-  fetchpatch,
   cmake,
   libuuid,
   expat,
@@ -25,38 +24,18 @@ assert lib.assertMsg (
   withPostgreSQL || withSQLite
 ) "At least one Biboumi database provider required";
 
-let
-  catch = fetchFromGitea {
-    domain = "codeberg.org";
-    owner = "poezio";
-    repo = "catch";
-    tag = "v2.2.1";
-    hash = "sha256-dGUnB/KPONqPno1aO5cOSiE5N4lUiTbMUcH0X6HUoCk=";
-  };
-
-  pname = "biboumi";
-  version = "9.0";
-in
 stdenv.mkDerivation {
-  inherit pname version;
+  pname = "biboumi";
+  version = "9.0-unstable-2025-10-27";
 
   src = fetchFromGitea {
     domain = "codeberg.org";
     owner = "poezio";
     repo = "biboumi";
-    tag = version;
-    hash = "sha256-yjh9WFuFjaoZLfXTfZajmdRO+3KZqJYBEd0HgqcC28A=";
+    rev = "61242c35bc825d58c9db4301b5696bc17428bf98";
+    hash = "sha256-BZTqu2Qvfqag9pwymlGrItLbOXQf3VMKQS2+3pxlJbE=";
   };
 
-  patches = [
-    ./catch.patch
-    (fetchpatch {
-      name = "update_botan_to_version_3.patch";
-      url = "https://codeberg.org/poezio/biboumi/commit/e4d32f939240ed726e9981e42c0dc251cd9879da.patch";
-      hash = "sha256-QUt2ZQtoouLHAeEUlJh+yfCYEmLboL/tk6O2TbHR67Q=";
-    })
-  ];
-
   nativeBuildInputs = [
     cmake
     pkg-config
@@ -87,7 +66,6 @@ stdenv.mkDerivation {
 
   preConfigure = ''
     substituteInPlace CMakeLists.txt --replace /etc/biboumi $out/etc/biboumi
-    cp ${catch}/single_include/catch.hpp tests/
   '';
 
   doCheck = true;