diff --git a/var/spack/repos/builtin/packages/dakota/package.py b/var/spack/repos/builtin/packages/dakota/package.py
index 30aaa4b84f4..2ab8e46e7a6 100644
--- a/var/spack/repos/builtin/packages/dakota/package.py
+++ b/var/spack/repos/builtin/packages/dakota/package.py
@@ -42,6 +42,12 @@ class Dakota(CMakePackage):
 
     license("LGPL-2.1-or-later")
 
+    version(
+        "6.20.0",
+        tag="v6.20.0",
+        commit="494027b37264ec9268f2de8649d071de0232c534",
+        submodules=submodules,
+    )
     version(
         "6.19.0",
         tag="v6.19.0",
@@ -76,7 +82,7 @@ class Dakota(CMakePackage):
     depends_on("python", when="+python")
     depends_on("perl-data-dumper", type="build", when="@6.12:")
     depends_on("boost@:1.68.0", when="@:6.12")
-    depends_on("boost@1.69.0:", when="@6.18:")
+    depends_on("boost@1.69.0:1.84.0", when="@6.18:6.20")
     depends_on("boost +filesystem +program_options +regex +serialization +system")
 
     # TODO: replace this with an explicit list of components of Boost,