diff --git a/ChangeLog b/ChangeLog
index 8d5937417..8cf2e0f0f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2010-02-01  Alexandre Duret-Lutz  <adl@lrde.epita.fr>
+
+	* NEWS, configure.ac: Bump version to 0.5a.
+
 2010-02-01  Alexandre Duret-Lutz  <adl@lrde.epita.fr>
 
 	Release Spot 0.5.
diff --git a/NEWS b/NEWS
index cbbacc17d..6ef939145 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,7 @@
+New in spot 0.5a
+
+  * Nothing yet.
+
 New in spot 0.5 (2010-02-01):
 
   * We have setup two mailing lists:
diff --git a/configure.ac b/configure.ac
index 2f170cec9..49cee4111 100644
--- a/configure.ac
+++ b/configure.ac
@@ -22,7 +22,7 @@
 # 02111-1307, USA.
 
 AC_PREREQ([2.61])
-AC_INIT([spot], [0.5], [spot@lrde.epita.fr])
+AC_INIT([spot], [0.5a], [spot@lrde.epita.fr])
 AC_CONFIG_AUX_DIR([tools])
 AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE([1.11 gnits nostdinc tar-ustar color-tests parallel-tests])