diff --git a/CMakeLists.txt b/CMakeLists.txt
index fa7f009a1..249953424 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.14)
+cmake_minimum_required(VERSION 3.20)
 
 project(POET
   LANGUAGES CXX C
diff --git a/README.md b/README.md
index 4e01e1c59..f92d70c7f 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ To compile POET you need following software to be installed:
 
 - C/C++ compiler (tested with GCC)
 - MPI-Implementation (tested with OpenMPI and MVAPICH)
-- CMake 3.9+
+- CMake 3.20+
 - Eigen3 3.4+ (required by `tug`)
 - *optional*: `doxygen` with `dot` bindings for documentation
 - R language and environment including headers or `-dev` packages
diff --git a/ext/tug b/ext/tug
index 449647010..9c4aeee41 160000
--- a/ext/tug
+++ b/ext/tug
@@ -1 +1 @@
-Subproject commit 449647010ab9cdf9e405139f360424a2b21ab3ab
+Subproject commit 9c4aeee410c71d064f7567143d4f8d6451ade75a