diff --git a/cmake/Modules/Packages/RHEO.cmake b/cmake/Modules/Packages/RHEO.cmake
index be8c22877b..7639acd8bc 100644
--- a/cmake/Modules/Packages/RHEO.cmake
+++ b/cmake/Modules/Packages/RHEO.cmake
@@ -1,2 +1,2 @@
-find_package(GSL 2.7 REQUIRED)
+find_package(GSL 2.6 REQUIRED)
 target_link_libraries(lammps PRIVATE GSL::gsl)