diff --git a/man/erb.1 b/man/erb.1
index 3b350e0064..e2821acb6d 100644
--- a/man/erb.1
+++ b/man/erb.1
@@ -1,5 +1,5 @@
 .\"Ruby is copyrighted by Yukihiro Matsumoto <matz@netlab.jp>.
-.Dd November 15, 2012
+.Dd October 21, 2017
 .Dt ERB \&1 "Ruby Programmer's Reference Guide"
 .Os UNIX
 .Sh NAME
diff --git a/man/goruby.1 b/man/goruby.1
index 47a015f34d..a305a5afce 100644
--- a/man/goruby.1
+++ b/man/goruby.1
@@ -1,5 +1,5 @@
 .\"Ruby is copyrighted by Yukihiro Matsumoto <matz@netlab.jp>.
-.Dd November 15, 2012
+.Dd April 20, 2017
 .Dt GORUBY \&1 "Ruby Programmer's Reference Guide"
 .Os UNIX
 .Sh NAME
diff --git a/man/irb.1 b/man/irb.1
index e980a2ebfd..3e7ec6ff9d 100644
--- a/man/irb.1
+++ b/man/irb.1
@@ -1,5 +1,5 @@
 .\"Ruby is copyrighted by Yukihiro Matsumoto <matz@netlab.jp>.
-.Dd November 15, 2012
+.Dd April 20, 2017
 .Dt IRB \&1 "Ruby Programmer's Reference Guide"
 .Os UNIX
 .Sh NAME
diff --git a/man/ruby.1 b/man/ruby.1
index 5287225615..4dd19054d3 100644
--- a/man/ruby.1
+++ b/man/ruby.1
@@ -1,5 +1,5 @@
 .\"Ruby is copyrighted by Yukihiro Matsumoto <matz@netlab.jp>.
-.Dd October 31, 2015
+.Dd April 14, 2018
 .Dt RUBY \&1 "Ruby Programmer's Reference Guide"
 .Os UNIX
 .Sh NAME