diff --git a/var/spack/repos/builtin/packages/r-gmp/package.py b/var/spack/repos/builtin/packages/r-gmp/package.py
index 9a686d8632c..13b890220d6 100644
--- a/var/spack/repos/builtin/packages/r-gmp/package.py
+++ b/var/spack/repos/builtin/packages/r-gmp/package.py
@@ -31,7 +31,7 @@ class RGmp(RPackage):
        using the C library GMP (GNU Multiple Precision Arithmetic)."""
 
     homepage = "http://mulcyber.toulouse.inra.fr/projects/gmp"
-    url      = "https://cran.r-project.org/src/contrib/gmp_0.5-12.tar.gz"
+    url      = "https://cran.r-project.org/src/contrib/gmp_0.5-13.1.tar.gz"
     list_url = "https://cran.r-project.org/src/contrib/Archive/gmp"
 
     version('0.5-13.1', '4a45d45e53bf7140720bd44f10b075ed')
diff --git a/var/spack/repos/builtin/packages/r-rmpfr/package.py b/var/spack/repos/builtin/packages/r-rmpfr/package.py
index 3b2827e2217..cbf9b3d3c2d 100644
--- a/var/spack/repos/builtin/packages/r-rmpfr/package.py
+++ b/var/spack/repos/builtin/packages/r-rmpfr/package.py
@@ -33,7 +33,7 @@ class RRmpfr(RPackage):
        is based on the GMP (GNU Multiple Precision) Library."""
 
     homepage = "http://rmpfr.r-forge.r-project.org"
-    url      = "https://cran.r-project.org/src/contrib/Rmpfr_0.6-0.tar.gz"
+    url      = "https://cran.r-project.org/src/contrib/Rmpfr_0.6-1.tar.gz"
     list_url = "https://cran.r-project.org/src/contrib/Archive/Rmpfr"
 
     version('0.6-1', '55d4ec257bd2a9233bafee9e444d0265')