diff --git a/cmake/toolchain/heptools-dev-base.cmake b/cmake/toolchain/heptools-dev-base.cmake
index 463070774d0e04cfc87d99f17436c610e05f3d1c..9d492613b3faeb402428aba2de4387223f4b844e 100644
--- a/cmake/toolchain/heptools-dev-base.cmake
+++ b/cmake/toolchain/heptools-dev-base.cmake
@@ -142,7 +142,7 @@ if(NOT ${LCG_OS} STREQUAL mac)
 endif()
 LCG_external_package(decorator         4.3.2                                    )
 LCG_external_package(defusedxml        0.6.0                                    )
-LCG_external_package(delphes           3.4.2pre17                               )
+LCG_external_package(delphes           3.4.2pre18                               )
 LCG_external_package(dill              0.2.9                                    )
 LCG_external_package(distributed       1.28.1                                   )
 LCG_external_package(doxygen           1.8.15                                   )