diff --git a/ChangeLog b/ChangeLog
index 2f748e160..dbfef01de 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2007-12-24  Bruno Haible  <bruno@clisp.org>
+
+	* version.sh: Bump to 0.18-pre1.
+
 2007-11-10  Bruno Haible  <bruno@clisp.org>
 
 	* Makefile.am (distcheck-hook): Add a check for eoverflow.m4.
diff --git a/version.sh b/version.sh
index 9b4ac9396..42aa03169 100644
--- a/version.sh
+++ b/version.sh
@@ -1,3 +1,3 @@
 # Version number and release date.
-VERSION_NUMBER=0.17
-RELEASE_DATE=2007-11-07      # in "date +%Y-%m-%d" format
+VERSION_NUMBER=0.18-pre1
+RELEASE_DATE=2007-12-24      # in "date +%Y-%m-%d" format