diff --git a/.gitmodules b/.gitmodules
index 6c0e851..428668f 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -10,4 +10,4 @@
 [submodule "external/eigen"]
 	path = external/eigen
 	url = https://gitlab.com/libeigen/eigen.git
-	branch = 3.3
+	branch = 3.4