diff --git a/CMakeLists.txt b/CMakeLists.txt
index aa068385..b9ba5190 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -79,7 +79,7 @@ endif()
 # ============
 
 set(xtl_REQUIRED_VERSION 0.7.0)
-set(xeus_REQUIRED_VERSION 3)
+set(xeus_REQUIRED_VERSION 3.0...<4.0)
 
 if (NOT TARGET xtl)
     find_package(xtl ${xtl_REQUIRED_VERSION} REQUIRED)