Bump version numbers.
diff --git a/Doc/Makefile b/Doc/Makefile
index 2dcfa2b..328e426 100644
--- a/Doc/Makefile
+++ b/Doc/Makefile
@@ -66,7 +66,7 @@
# This is the *documentation* release, and is used to construct the file
# names of the downloadable tarballs.
-RELEASE=2.3b2
+RELEASE=2.3c1
PYTHON= python
DVIPS= dvips -N0 -t $(PAPER)
diff --git a/Doc/texinputs/boilerplate.tex b/Doc/texinputs/boilerplate.tex
index 5580abe..6aa754b 100644
--- a/Doc/texinputs/boilerplate.tex
+++ b/Doc/texinputs/boilerplate.tex
@@ -7,5 +7,5 @@
\date{\today} % XXX update before final release!
\release{2.3} % software release, not documentation
-\setreleaseinfo{b2+} % empty for final release
+\setreleaseinfo{c1} % empty for final release
\setshortversion{2.3} % major.minor only for software