diff --git a/apps/CMakeLists.txt b/apps/CMakeLists.txt
index 8dd8845f35..c4b7e37543 100644
--- a/apps/CMakeLists.txt
+++ b/apps/CMakeLists.txt
@@ -3,7 +3,7 @@
 #
 # (based originally on the libLAS files copyright Mateusz Loskot)
 
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.5)
 
 #------------------------------------------------------------------------------
 # Configure build targets
diff --git a/cmake/ctest.cmake b/cmake/ctest.cmake
index a8382aaef5..98035205d1 100644
--- a/cmake/ctest.cmake
+++ b/cmake/ctest.cmake
@@ -5,7 +5,7 @@ if(ENABLE_CTEST)
     if (WITH_TESTS)
         message(STATUS
             "Enable CTest to support submissions of results to CDash at http://cdash.org")
-        cmake_minimum_required(VERSION 2.8.0)
+        cmake_minimum_required(VERSION 3.5.0)
         #
         # Dashboard has been prepared for experiments
         # http://my.cdash.org/index.php?project=PDAL
diff --git a/dimbuilder/CMakeLists.txt b/dimbuilder/CMakeLists.txt
index 09d334f1f8..9aa9742f63 100644
--- a/dimbuilder/CMakeLists.txt
+++ b/dimbuilder/CMakeLists.txt
@@ -2,7 +2,7 @@
 # The seemingly strange arrangement of this cmake file allows you to build
 # this application as a standalone.
 #
-cmake_minimum_required(VERSION 2.8.6)
+cmake_minimum_required(VERSION 3.5)
 
 set(MAKE_COLOR_MAKEFILE ON)
 
diff --git a/plugins/rdb/CMakeLists.txt b/plugins/rdb/CMakeLists.txt
index 2ec0adcf92..2e8ae422de 100644
--- a/plugins/rdb/CMakeLists.txt
+++ b/plugins/rdb/CMakeLists.txt
@@ -1,6 +1,6 @@
 
 if (STANDALONE)
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.5)
 set(ROOT_DIR "../../${PROJECT_SOURCE_DIR}")
 include(../../cmake/common.cmake NO_POLICY_SCOPE)
 include(FeatureSummary)
diff --git a/tools/lasdump/CMakeLists.txt b/tools/lasdump/CMakeLists.txt
index 8083a228d8..767d642e76 100644
--- a/tools/lasdump/CMakeLists.txt
+++ b/tools/lasdump/CMakeLists.txt
@@ -2,7 +2,7 @@
 # The seemingly strange arrangement of this cmake file allows you to build
 # lasdump as a standalone.
 #
-cmake_minimum_required(VERSION 2.8.6)
+cmake_minimum_required(VERSION 3.5)
 
 set(MAKE_COLOR_MAKEFILE ON)
 
diff --git a/vendor/gtest/CMakeLists.txt b/vendor/gtest/CMakeLists.txt
index db292946a5..e41e59761e 100644
--- a/vendor/gtest/CMakeLists.txt
+++ b/vendor/gtest/CMakeLists.txt
@@ -53,7 +53,7 @@ else()
   cmake_policy(SET CMP0048 NEW)
   project(gtest VERSION ${GOOGLETEST_VERSION} LANGUAGES CXX C)
 endif()
-cmake_minimum_required(VERSION 2.6.4)
+cmake_minimum_required(VERSION 3.5)
 
 if (POLICY CMP0063) # Visibility
   cmake_policy(SET CMP0063 NEW)