diff --git a/Versions.cmake b/Versions.cmake
index 1934a01e1..e27a535c7 100644
--- a/Versions.cmake
+++ b/Versions.cmake
@@ -2,5 +2,5 @@
 set (WSJTX_VERSION_MAJOR 1)
 set (WSJTX_VERSION_MINOR 6)
 set (WSJTX_VERSION_PATCH 0)
-set (WSJTX_RC 0)		 # release candidate number, comment out or zero for development versions
+set (WSJTX_RC 1)		 # release candidate number, comment out or zero for development versions
 set (WSJTX_VERSION_IS_RELEASE 0) # set to 1 for final release build