diff --git a/doc/h2load.1 b/doc/h2load.1
index 6e34d8ca..65f3182e 100644
--- a/doc/h2load.1
+++ b/doc/h2load.1
@@ -1,6 +1,6 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "H2LOAD" "1" "May 26, 2017" "1.23.0" "nghttp2"
+.TH "H2LOAD" "1" "May 30, 2017" "1.23.1" "nghttp2"
 .SH NAME
 h2load \- HTTP/2 benchmarking tool
 .
diff --git a/doc/nghttp.1 b/doc/nghttp.1
index 04392e07..c7f62f6b 100644
--- a/doc/nghttp.1
+++ b/doc/nghttp.1
@@ -1,6 +1,6 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "NGHTTP" "1" "May 26, 2017" "1.23.0" "nghttp2"
+.TH "NGHTTP" "1" "May 30, 2017" "1.23.1" "nghttp2"
 .SH NAME
 nghttp \- HTTP/2 client
 .
diff --git a/doc/nghttpd.1 b/doc/nghttpd.1
index 0a8366d2..6575efd1 100644
--- a/doc/nghttpd.1
+++ b/doc/nghttpd.1
@@ -1,6 +1,6 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "NGHTTPD" "1" "May 26, 2017" "1.23.0" "nghttp2"
+.TH "NGHTTPD" "1" "May 30, 2017" "1.23.1" "nghttp2"
 .SH NAME
 nghttpd \- HTTP/2 server
 .
diff --git a/doc/nghttpx.1 b/doc/nghttpx.1
index 273474de..0934c630 100644
--- a/doc/nghttpx.1
+++ b/doc/nghttpx.1
@@ -1,6 +1,6 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "NGHTTPX" "1" "May 26, 2017" "1.23.0" "nghttp2"
+.TH "NGHTTPX" "1" "May 30, 2017" "1.23.1" "nghttp2"
 .SH NAME
 nghttpx \- HTTP/2 proxy
 .