diff --git a/doc/Guidebook.mn b/doc/Guidebook.mn
index 12466c2d1..04c6dc040 100644
--- a/doc/Guidebook.mn
+++ b/doc/Guidebook.mn
@@ -24,7 +24,7 @@
 .ds vr "NetHack 3.6
 .ds f0 "\*(vr
 .ds f1
-.ds f2 "December 15, 2018
+.ds f2 "February 10, 2019
 .
 .\" A note on some special characters:
 .\" \(lq = left double quote
diff --git a/doc/Guidebook.tex b/doc/Guidebook.tex
index 81f1f8b39..5011da014 100644
--- a/doc/Guidebook.tex
+++ b/doc/Guidebook.tex
@@ -45,7 +45,7 @@
 %.au
 \author{Original version - Eric S. Raymond\\
 (Edited and expanded for 3.6 by Mike Stephenson and others)}
-\date{December 15, 2018}
+\date{February 10, 2019}
 
 \maketitle