diff --git a/.travis.yml b/.travis.yml
index 2933e44c..a716c811 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,6 +12,7 @@
 ## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 ##
 ## Copyright 2017-2018,2020 by Claus Hunsen <hunsen@fim.uni-passau.de>
+## Copyright 2020 by Thomas Bock <bockthom@cs.uni-saarland.de>
 ## All Rights Reserved.
 
 # TravisCI container
@@ -26,6 +27,7 @@ r:
   - 3.4
   - 3.5
   - 3.6
+  - 4.0
 cache: packages
 repos:
   CRAN: https://cloud.r-project.org
diff --git a/NEWS.md b/NEWS.md
index 4478c76d..b1bfc74b 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -9,6 +9,8 @@
 
 ### Changed/Improved
 - Adjust the function `get.authors.by.data.source`: Rename its single parameter to `data.sources` and change the function so that it can extract the authors for multiple data sources at once. The default value of the parameter is a vector containing all the available data sources (commits, mails, issues) (051a5f0287022f97e2367ed0e9591b9df9dbdb3d)
+- Adjust recommended R version to 3.6.3 in README (92be262514277acb774ab2885c1c0d1c10f03373)
+- Add R version 4.0 to test suite and adjust package installation in `install.R` to improve compatibility with Travis CI (40aa0d80e2a94434a8be75925dbefbde6d3518b2, 1ba036758a63767e2fcef525c98f5a4fd6938c39, #161)
 
 
 ## 3.6
diff --git a/README.md b/README.md
index 13d7cf36..e8cbcbb1 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ If you wonder: The name `coronet` derives as an acronym from the words "configur
 
 - [Integration](#integration)
     * [Requirements](#requirements)
-        * [R](#r-331)
+        * [R](#r)
         * [packrat (recommended)](#packrat)
         * [Folder structure of the input data](#folder-structure-of-the-input-data)
         * [Needed R packages](#needed-r-packages)
@@ -53,9 +53,11 @@ If you wonder: The name `coronet` derives as an acronym from the words "configur
 
 While using the package, we require the following infrastructure.
 
-#### [`R`](https://www.r-project.org/) `3.3.1`
+#### [`R`](https://www.r-project.org/) 
 
-Later `R` versions should work (and are tested using our TravisCI script), but, for reliability reasons and `packrat` compatibility, only version `3.3.1` is supported.
+Minimum requirement is `R` version `3.3.1`. Hence, later `R` versions also work.
+
+We currently recommend version `3.6.3` for reliability reasons and `packrat` compatibility, but also later versions (`>=4`) should work (and are tested using our TravisCI script).
 
 #### [`packrat`](http://rstudio.github.io/packrat/) (recommended)
 
diff --git a/install.R b/install.R
index 3b4c4758..132879d9 100644
--- a/install.R
+++ b/install.R
@@ -16,6 +16,7 @@
 ## Copyright 2015 by Wolfgang Mauerer <wolfgang.mauerer@oth-regensburg.de>
 ## Copyright 2015-2017 by Claus Hunsen <hunsen@fim.uni-passau.de>
 ## Copyright 2017 by Thomas Bock <bockthom@fim.uni-passau.de>
+## Copyright 2020 by Thomas Bock <bockthom@cs.uni-saarland.de>
 ## Copyright 2019 by Anselm Fehnker <fehnker@fim.uni-passau.de>
 ## All Rights Reserved.
 ##
@@ -55,5 +56,7 @@ filter.installed.packages = function(packageList)  {
 p = filter.installed.packages(packages)
 if (length(p) > 0) {
     print(sprintf("Installing package '%s'.", p))
-    install.packages(p, dependencies = TRUE, verbose = FALSE, quiet = FALSE)
+
+    ## set dependencies to 'NA' to install only necessary dependencies (i.e., "Depends", "Imports", "LinkingTo")
+    install.packages(p, dependencies = NA, verbose = TRUE, quiet = TRUE)
 }