diff --git a/nix/build-all.py b/nix/build-all.py
index cc3565f519..3bd9215598 100644
--- a/nix/build-all.py
+++ b/nix/build-all.py
@@ -135,7 +135,7 @@ JSON_VERSION = "3.11.3"
 OCE_VERSION = "0.18.3"
 OCCT_VERSION = "7.8.1"
 BOOST_VERSION = "1.86.0"
-EIGEN_VERSION = "3.3.9"
+EIGEN_VERSION = "3.4.0"
 PCRE_VERSION = "8.41"
 PCRE2_VERSION = "10.32"
 LIBXML2_VERSION = "2.13.8"