diff --git a/var/spack/repos/builtin/packages/r-mass/package.py b/var/spack/repos/builtin/packages/r-mass/package.py
index 02855eb9b05ae1023f2d71d37c00b4de589c6494..96cac8456618c76ef837236f72163f0ad6054176 100644
--- a/var/spack/repos/builtin/packages/r-mass/package.py
+++ b/var/spack/repos/builtin/packages/r-mass/package.py
@@ -14,7 +14,8 @@ class RMass(RPackage):
     url      = "https://cloud.r-project.org/src/contrib/MASS_7.3-47.tar.gz"
     list_url = "https://cloud.r-project.org/src/contrib/Archive/MASS"
 
-    version('7.3-51.4', sha256='9911d546a8d29dc906b46cb53ef8aad76d23566f4fc3b52778a1201f8a9b2c74')
+    version('7.3-51.5', sha256='464c0615cef01820cde2bb8457e81575d6755ae9b3ac99f3bfaaac47d43d15cc')
+    version('7.3-51.4', sha256='844270a2541eaed420871dfb61d681aa67ee57126645fb6b144b436c25698eeb')
     version('7.3-51.3', sha256='5b0e0e7704d43a94b08dcc4b3fe600b9723d1b3e446dd393e82d39ddf66608b6')
     version('7.3-47',   sha256='ed44cdabe84fff3553122267ade61d5cc68071c435f7645d36c8f2e4e9f9c6bf')