diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2a20f89f4..e3a944b08 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -52,10 +52,11 @@ FetchContent_Declare(
 
 FetchContent_Declare(
   Eigen
+  GIT_SHALLOW TRUE
   GIT_REPOSITORY https://gitlab.com/libeigen/eigen
   GIT_PROGRESS TRUE
-  GIT_BRANCH "3.3"
-  GIT_TAG "3.3.5"
+  GIT_BRANCH "3.4"
+  GIT_TAG "3.4.0"
 )
 
 FetchContent_Declare(
diff --git a/README.md b/README.md
index 3572118ef..ccf014887 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ This library comprises a suite of C++ algorithms used by the Fluid Corpus Manipu
 # Dependencies
 
 * [CMake](http://cmake.org) (>=3.11)
-* [Eigen](https://gitlab.com/libeigen/eigen) (3.3.5)
+* [Eigen](https://gitlab.com/libeigen/eigen) (3.4)
 * [HISSTools Library](https://github.com/AlexHarker/HISSTools_Library)
 
 # Building