diff --git a/app-text/ebook-tools/ebook-tools-0.2.2-r2.ebuild b/app-text/ebook-tools/ebook-tools-0.2.2-r2.ebuild
index 50b2469665eb1..29c9aec7e577a 100644
--- a/app-text/ebook-tools/ebook-tools-0.2.2-r2.ebuild
+++ b/app-text/ebook-tools/ebook-tools-0.2.2-r2.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -26,6 +26,7 @@ PATCHES=(
 	"${FILESDIR}/${P}-crashfix.patch"
 	"${FILESDIR}/${P}-fvisibility-hidden.patch"
 	"${FILESDIR}/${P}-libzip-cmake.patch"
+	"${FILESDIR}/${P}-cmake4.patch" # bug 955639
 )
 
 src_prepare() {
diff --git a/app-text/ebook-tools/files/ebook-tools-0.2.2-cmake4.patch b/app-text/ebook-tools/files/ebook-tools-0.2.2-cmake4.patch
new file mode 100644
index 0000000000000..a71850cd3ab7b
--- /dev/null
+++ b/app-text/ebook-tools/files/ebook-tools-0.2.2-cmake4.patch
@@ -0,0 +1,11 @@
+--- a/CMakeLists.txt	2012-09-04 16:32:32.000000000 +0200
++++ b/CMakeLists.txt	2025-05-08 21:58:17.596985926 +0200
+@@ -1,6 +1,6 @@
+-project (EBOOK-TOOLS C)
++cmake_minimum_required(VERSION 3.5.0)
+ 
+-cmake_minimum_required(VERSION 2.4.0)
++project (EBOOK-TOOLS C)
+ 
+ #set(CMAKE_CURRENT_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/src)
+ set(LIBRARY_OUTPUT_PATH ${EBOOK-TOOLS_BINARY_DIR}/libs)