diff --git a/CHANGELOG.md b/CHANGELOG.md
index cf5a140e..bd2965d9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@ Version 122:
 * Add test for issue 807
 * assert on empty buffer in websocket read
 * Fix zlib symbol conflicts
+* CMake 3.5.1 is required
 
 --------------------------------------------------------------------------------
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8ec69750..40f3ea7c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,7 +7,7 @@
 # Official repository: https://github.com/boostorg/beast
 #
 
-cmake_minimum_required (VERSION 3.5.2)
+cmake_minimum_required (VERSION 3.5.1)
 
 project (Beast VERSION 121)
 
diff --git a/README.md b/README.md
index 73da7377..78fa27fa 100644
--- a/README.md
+++ b/README.md
@@ -73,7 +73,7 @@ When using Microsoft Visual C++, Visual Studio 2015 Update 3 or later is require
 One of these components is required in order to build the tests and examples:
 
 * Properly configured bjam/b2
-* CMake 3.7.2 or later (Windows only)
+* CMake 3.5.1 or later (Windows only)
 
 ## Building