diff --git a/toolchain.cmake b/toolchain.cmake
index bd88d9e581680f45daa90409b3d9bc36f2f3e21a..cff5f5448713f49127e358e66c48a1d8446d1e1b 100644
--- a/toolchain.cmake
+++ b/toolchain.cmake
@@ -1,5 +1,5 @@
 # Set the version of HEPTools to use
-set(heptools_version 88)
+set(heptools_version 91)
 
 # this check is needed because the toolchain is called when checking the
 # compiler (without the proper cache)