diff --git a/CMakeLists.txt b/CMakeLists.txt
index 727d135..4e110be 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.9)
 
-project(fast_float VERSION 4.0.0 LANGUAGES CXX)
+project(fast_float VERSION 5.1.0 LANGUAGES CXX)
 option(FASTFLOAT_TEST "Enable tests" OFF)
 if(FASTFLOAT_TEST)
   enable_testing()
diff --git a/README.md b/README.md
index fe1c1ca..55fcc33 100644
--- a/README.md
+++ b/README.md
@@ -264,7 +264,7 @@ the command line help.
 
 You may directly download automatically generated single-header files:
 
-https://github.com/fastfloat/fast_float/releases/download/v3.4.0/fast_float.h
+https://github.com/fastfloat/fast_float/releases/download/v5.1.0/fast_float.h
 
 ## Credit