diff --git a/README b/README
index 9a4923d03..e6bf764f8 100644
--- a/README
+++ b/README
@@ -110,8 +110,8 @@ Please read items (1), (2) and (3) BEFORE doing anything with your new code.
 
         Intel Pentium or better running Linux, BSDI
         Intel Pentium or better running Windows 10 or 11
-        Intel-based, or Apple M1, M2, M3 Macs running
-            macOS 10.11 (El Capitan) to macOS 14 (Sonoma)
+        Intel-based, or Apple M1, M2, M3, M4, M5 Macs running
+            macOS 10.11 (El Capitan) to macOS 26 (Tahoe)
             (follow the instructions in sys/unix/NewInstall.unx)
         Intel 80386 or greater running MS-DOS with DPMI
             built via djgpp compiler (native or Linux-hosted cross-compiler)
diff --git a/doc/Guidebook.mn b/doc/Guidebook.mn
index 73fa5d454..95bd7be35 100644
--- a/doc/Guidebook.mn
+++ b/doc/Guidebook.mn
@@ -47,7 +47,7 @@
 .ds f0 \*(vr
 .ds f1 \" empty
 .\"DO NOT REMOVE NH_DATESUB .ds f2 Date(%B %-d, %Y)
-.ds f2 May 1, 2025
+.ds f2 October 24, 2025
 .
 .\" A note on some special characters:
 .\" \(lq = left double quote
diff --git a/doc/Guidebook.tex b/doc/Guidebook.tex
index d24078ba8..4bd01c70c 100644
--- a/doc/Guidebook.tex
+++ b/doc/Guidebook.tex
@@ -48,7 +48,7 @@
 \author{Original version - Eric S. Raymond\\
 (Edited and expanded for 3.7.0 by Mike Stephenson and others)}
 %DO NOT REMOVE NH_DATESUB \date{Date(%B %-d, %Y)}
-\date{May 1, 2025}
+\date{October 24, 2025}
 
 \maketitle