diff --git a/cmake/BoostSML.cmake b/cmake/BoostSML.cmake
index b7707b5..c47afe9 100644
--- a/cmake/BoostSML.cmake
+++ b/cmake/BoostSML.cmake
@@ -1,7 +1,7 @@
 include(ExternalProject)
 
 ExternalProject_Add(BoostSML
-    URL "https://raw.githubusercontent.com/boost-experimental/sml/master/include/boost/sml.hpp"
+    URL "https://raw.githubusercontent.com/boost-ext/sml/ebd6f54bc3a9c3afec2787b5ad629426815a279f/include/boost/sml.hpp"
     DOWNLOAD_NO_EXTRACT 1
     DOWNLOAD_DIR "${CMAKE_CURRENT_SOURCE_DIR}/external/boost/"
     CONFIGURE_COMMAND ""