diff --git a/CMakeLists.txt b/CMakeLists.txt
index ff292c1..47542e1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,7 +7,7 @@
 #
 #########################################################
 
-cmake_minimum_required( VERSION 3.5 ) 
+cmake_minimum_required( VERSION 3.18 ) 
 
 project(gumbo) 
 
diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index e451bac..a9ab28e 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -1,7 +1,7 @@
 # Build examples/clean_text to ensure c++ code can
 # be linked to newly built gumbo shared library.
 
-cmake_minimum_required(VERSION 3.0) 
+cmake_minimum_required(VERSION 3.18) 
 
 # project(examples)
 
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 48f7351..8f713e5 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -7,7 +7,7 @@
 #
 #########################################################
 
-cmake_minimum_required( VERSION 3.0 ) 
+cmake_minimum_required( VERSION 3.18 ) 
 
 project(gumbo C)
 
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index e00a71b..5e31223 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -1,7 +1,7 @@
 # Build examples/clean_text to ensure c++ code can
 # be linked to newly built gumbo shared library.
 
-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.18)
 
 
 set( test_executable run_tests )