diff --git a/Changes b/Changes
index e31733948..61742c76f 100644
--- a/Changes
+++ b/Changes
@@ -3,6 +3,9 @@ Revision history for Verilator
 The contributors that suggested a given feature are shown in []. Thanks!
 
 
+* Verilator 3.901 devel
+
+
 * Verilator 3.900 2017-01-15
 
 **    Internal code changes for improved compatibility and performance.
diff --git a/configure.ac b/configure.ac
index 285e7687d..8405bd123 100644
--- a/configure.ac
+++ b/configure.ac
@@ -6,7 +6,7 @@
 
 #AC_INIT([Verilator],[#.### YYYY-MM-DD])
 #AC_INIT([Verilator],[#.### devel])
-AC_INIT([Verilator],[3.900 2017-01-15])
+AC_INIT([Verilator],[3.901 devel])
 # When releasing, also update header of Changes file
 
 AC_CONFIG_HEADER(src/config_build.h)