diff --git a/Changes b/Changes
index 2252d8b31..d6a81dd3d 100644
--- a/Changes
+++ b/Changes
@@ -3,7 +3,7 @@ Revision history for Verilator
 The contributors that suggested a given feature are shown in [].  [by ...]
 indicates the contributor was also the author of the fix; Thanks!
 
-* Verilator 3.865 devel
+* Verilator 3.866 2014-11-15
 
 ***   Fix +define+A+B to define A and B to match other simulators, bug847. [Adam Krolnik]
 
diff --git a/configure.ac b/configure.ac
index a2af99cbb..21386f32e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -6,7 +6,7 @@
 
 #AC_INIT([Verilator],[#.### YYYY-MM-DD])
 #AC_INIT([Verilator],[#.### devel])
-AC_INIT([Verilator],[3.865 devel])
+AC_INIT([Verilator],[3.866 2014-11-15])
 AC_CONFIG_HEADER(src/config_build.h)
 AC_CONFIG_FILES(Makefile src/Makefile src/Makefile_obj include/verilated.mk include/verilated_config.h)