diff --git a/var/spack/repos/builtin/packages/sundials/package.py b/var/spack/repos/builtin/packages/sundials/package.py
index a4a0592386..0d41344a8d 100644
--- a/var/spack/repos/builtin/packages/sundials/package.py
+++ b/var/spack/repos/builtin/packages/sundials/package.py
@@ -27,6 +27,7 @@ class Sundials(CMakePackage, CudaPackage, ROCmPackage):
     # Versions
     # ==========================================================================
     version("develop", branch="develop")
+    version("6.5.0", sha256="4e0b998dff292a2617e179609b539b511eb80836f5faacf800e688a886288502")
     version("6.4.1", sha256="7bf10a8d2920591af3fba2db92548e91ad60eb7241ab23350a9b1bc51e05e8d0")
     version("6.4.0", sha256="0aff803a12c6d298d05b56839197dd09858631864017e255ed89e28b49b652f1")
     version("6.3.0", sha256="89a22bea820ff250aa7239f634ab07fa34efe1d2dcfde29cc8d3af11455ba2a7")