diff --git a/toolchain.cmake b/toolchain.cmake
index 6d47517e4439720ab7596f113607ab1fa0c90c01..17aa40c68a9042dc6736afc8a60fd8b35a4ded7d 100644
--- a/toolchain.cmake
+++ b/toolchain.cmake
@@ -1,5 +1,5 @@
 # Special wrapper to load the declared version of the heptools toolchain.
-set(heptools_version 79)
+set(heptools_version 84)
 
 find_file(use_heptools_module UseHEPTools.cmake
           HINTS ${CMAKE_CURRENT_SOURCE_DIR}/cmake)