diff --git a/var/spack/repos/builtin/packages/r-mlr/package.py b/var/spack/repos/builtin/packages/r-mlr/package.py
index d86d414fef..986bc955db 100644
--- a/var/spack/repos/builtin/packages/r-mlr/package.py
+++ b/var/spack/repos/builtin/packages/r-mlr/package.py
@@ -7,35 +7,44 @@
 
 
 class RMlr(RPackage):
-    """Interface to a large number of classification and regression techniques,
-       including machine-readable parameter descriptions. There is also an
-       experimental extension for survival analysis, clustering and general,
-       example-specific cost-sensitive learning. Generic resampling,
-       including cross-validation, bootstrapping and subsampling.
-       Hyperparameter tuning with modern optimization techniques,
-       for single- and multi-objective problems. Filter and wrapper methods for
-       feature selection. Extension of basic learners with additional
-       operations common in machine learning, also allowing for easy nested
-       resampling. Most operations can be parallelized."""
+    """Machine Learning in R
+
+    Interface to a large number of classification and regression techniques,
+    including machine-readable parameter descriptions. There is also an
+    experimental extension for survival analysis, clustering and general,
+    example-specific cost-sensitive learning. Generic resampling, including
+    cross-validation, bootstrapping and subsampling.  Hyperparameter tuning
+    with modern optimization techniques, for single- and multi-objective
+    problems. Filter and wrapper methods for feature selection. Extension of
+    basic learners with additional operations common in machine learning, also
+    allowing for easy nested resampling. Most operations can be
+    parallelized."""
 
     homepage = "https://github.com/mlr-org/mlr/"
     url      = "https://cloud.r-project.org/src/contrib/mlr_2.12.1.tar.gz"
     list_url = "https://cloud.r-project.org/src/contrib/Archive/mlr"
 
+    version('2.18.0', sha256='c2fe74e90ed32e5f4cbb0c09a1742051688d87db2f12dd408ddad0f5afc7f8d3')
     version('2.15.0', sha256='a3c2c2bd65a87d90b5e5e877b1ef8e7712e76b4eb1660d3f69672a1860ca5324')
     version('2.14.0', sha256='1f72184400678386c7c44297c4c92a448b50148de700df5ba0438d4e486e944a')
     version('2.13', sha256='e8729be7acddc1ea124c44f9493a8b903c5f54b97e09c714366553aed733011d')
     version('2.12.1', sha256='9cbb98b82eb493b783fe8808a18d76f32881d941364466ef8829b852fabbc82c')
     version('2.12', sha256='cfe00089ae4cd88c6d03826eda43d4fe29e467e3a7c95d103fafca8308f5c161')
 
+    # There are some potential variants for this.
+    # SystemRequirements: gdal (optional), geos (optional), proj (optional),
+    # udunits (optional), gsl (optional), gmp (optional), glu (optional), jags
+    # (optional)
+
     depends_on('r@3.0.2:', type=('build', 'run'))
     depends_on('r-paramhelpers@1.10:', type=('build', 'run'))
-    depends_on('r-bbmisc@1.11:', type=('build', 'run'))
     depends_on('r-backports@1.1.0:', type=('build', 'run'))
-    depends_on('r-ggplot2', type=('build', 'run'))
-    depends_on('r-stringi', type=('build', 'run'))
+    depends_on('r-bbmisc@1.11:', type=('build', 'run'))
     depends_on('r-checkmate@1.8.2:', type=('build', 'run'))
     depends_on('r-data-table', type=('build', 'run'))
+    depends_on('r-data-table@1.12.4:', when='@2.18.0:', type=('build', 'run'))
+    depends_on('r-ggplot2', type=('build', 'run'))
     depends_on('r-parallelmap@1.3:', type=('build', 'run'))
+    depends_on('r-stringi', type=('build', 'run'))
     depends_on('r-survival', type=('build', 'run'))
     depends_on('r-xml', type=('build', 'run'))