diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,7 +3,7 @@
 project(KHolidays)
 
 # ECM setup
-set(KF5_VERSION "5.28.0")
+set(KF5_VERSION "5.26.0")
 find_package(ECM ${KF5_VERSION} CONFIG REQUIRED)
 set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH})