diff --git a/DESCRIPTION b/DESCRIPTION
index e1f5622..cf3b863 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: unrtf
 Type: Package
 Title: Extract Text from Rich Text Format (RTF) Documents
-Version: 1.2
+Version: 1.3
 Authors@R: c(
     person("Jeroen", "Ooms", ,"jeroen@berkeley.edu", role = c("aut", "cre")),
     person("Free Software Foundation, Inc", role = "cph"))
@@ -10,7 +10,7 @@ Description: Wraps the 'unrtf' utility to extract text from RTF files. Supports
     because 'unrtf' has limited support for converting between character encodings.
 License: GPL-3
 Encoding: UTF-8
-Imports: sys
+Imports: sys (>= 2.0)
 URL: https://github.com/ropensci/unrtf#readme (devel) 
     https://www.gnu.org/software/unrtf/ (upstream)
 BugReports: http://github.com/ropensci/unrtf/issues