diff --git a/NEWS b/NEWS
index 94cc5522..d7492e51 100644
--- a/NEWS
+++ b/NEWS
@@ -4,6 +4,13 @@ vim: spelllang=en spell tw=78
 
 -------------------------------------------------------------------------------
 
+Changes in 1.6.6:
+
+* Added Ethernet drivers for kernels 6.4 and 6.12.
+* Added missing functions to fake user library.
+* Use sint(32) notation in EtherLab output driver
+* Added CONTRIBUTING.md
+
 Changes in 1.6.5:
 
 * Implemented interface changes of Linux 6.15.
diff --git a/configure.ac b/configure.ac
index 979d6646..b0b5d3c3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -30,7 +30,7 @@ AC_PREREQ([2.59])
 # - Update version number below
 # - make dist-bzip2
 #
-AC_INIT([ethercat], [1.6.5], [fp@igh.de])
+AC_INIT([ethercat], [1.6.6], [fp@igh.de])
 AC_CONFIG_AUX_DIR([autoconf])
 AM_INIT_AUTOMAKE([-Wall -Wno-override -Werror dist-bzip2 subdir-objects foreign])
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])