diff --git a/CMakeLists.txt b/CMakeLists.txt
index ef661b4cf74..19879ae7e94 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -197,7 +197,7 @@ set(_acts_boost_version 1.71.0)
 set(_acts_dd4hep_version 1.21)
 set(_acts_edm4hep_version 0.7)
 set(_acts_geomodel_version 6.3.0)
-set(_acts_eigen3_version 3.3.7)
+set(_acts_eigen3_version 3.4.0)
 set(_acts_podio_version 1.0.1) # will try this first
 set(_acts_podio_fallback_version 0.16) # if not found, will try this one
 set(_acts_doxygen_version 1.9.4)