diff --git a/Utilities/Release/cmake_release.sh b/Utilities/Release/cmake_release.sh
index d0b1c5445..288d7e6e8 100755
--- a/Utilities/Release/cmake_release.sh
+++ b/Utilities/Release/cmake_release.sh
@@ -23,8 +23,8 @@
 #
 
 # Release version number.
-TAG="Release-1-6-5"
-VERSION="1.6.5"
+TAG="Release-1-6-6"
+VERSION="1.6.6"
 RELEASE="1"
 PREVIOUS_VERSION="1.4.7"
 PREVIOUS_RELEASE="1"