Israel is improving its main nuclear site in the southern Negev, according to the Stockholm International Peace Research Institute's annual armaments assessment, released on Monday.
"Israel—which does not publicly acknowledge possessing nuclear weapons—is also believed to be modernizing its nuclear arsenal and appears to be upgrading its plutonium production reactor site at Dimona," the group said in its SIPRI Yearbook 2024.
The upgrade was part of a general trend, with all nine nuclear-armed states continuing to modernize their arsenals and several deploying "new nuclear-armed or nuclear-capable weapon systems in 2023," the report stated.
"[T]he number and types of nuclear weapons in development have increased as states deepen their reliance on nuclear deterrence," it added.
