diff --git a/.gitmodules b/.gitmodules
index 71384a1..cf42897 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -23,3 +23,6 @@
 [submodule "extlib/mimalloc"]
 	path = extlib/mimalloc
 	url = https://github.com/microsoft/mimalloc
+[submodule "extlib/eigen"]
+	path = extlib/eigen
+	url = https://gitlab.com/libeigen/eigen.git
diff --git a/extlib/eigen b/extlib/eigen
new file mode 160000
index 0000000..3147391
--- /dev/null
+++ b/extlib/eigen
@@ -0,0 +1 @@
+Subproject commit 3147391d946bb4b6c68edd901f2add6ac1f31f8c