diff --git a/CMakeLists.txt b/CMakeLists.txt
index 66b1804af..916f9df32 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.5)
 
 # Set the version number for the library
 set (GTSAM_VERSION_MAJOR 4)
diff --git a/cmake/example_cmake_find_gtsam/CMakeLists.txt b/cmake/example_cmake_find_gtsam/CMakeLists.txt
index d020f7032..05216d3f3 100644
--- a/cmake/example_cmake_find_gtsam/CMakeLists.txt
+++ b/cmake/example_cmake_find_gtsam/CMakeLists.txt
@@ -1,7 +1,7 @@
 # This file shows how to build and link a user project against GTSAM using CMake
 ###################################################################################
 # To create your own project, replace "example" with the actual name of your project
-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.5)
 project(example CXX)
 
 # Find GTSAM, either from a local build, or from a Debian/Ubuntu package.