diff --git a/CMakeLists.txt b/CMakeLists.txt
index e5e843c3aa..71e3bb9e37 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,7 @@
 
 cmake_minimum_required(VERSION 3.8...3.16)
 
-project(boost_math VERSION 1.90.0 LANGUAGES CXX)
+project(boost_math VERSION 1.91.0 LANGUAGES CXX)
 
 add_library(boost_math INTERFACE)