diff --git a/README.md b/README.md
index 0f37ead..7ff02a0 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@ Currently, the pre-built wheels only include the dynamic evolvers. For the faste
 Requires:
 - [NumPy](https://numpy.org/) (>= 1.21, < 3)
 - [Suzuki-Trotter-Evolver](https://github.com/Christopher-K-Long/Suzuki-Trotter-Evolver) (== 1.1.2, packaged with PySTE)
-- [Eigen3](https://eigen.tuxfamily.org/) (>=3.6, <6, packaged with PySTE)
+- [Eigen3](https://eigen.tuxfamily.org/) (>=3.4, <6, packaged with PySTE)
 
 Note that [Suzuki-Trotter-Evolver](https://github.com/Christopher-K-Long/Suzuki-Trotter-Evolver) and [Eigen3](https://eigen.tuxfamily.org/) are packaged with PySTE and so do not need to be installed separately.