diff --git a/release.md b/release.md
index 8ba011295..64c25cf3f 100644
--- a/release.md
+++ b/release.md
@@ -1,6 +1,6 @@
 # 9.6.6
 * Add wrapper to ecmccomp/applyComponent.cmd (automatically requires ecmccomp)
-* Cleanup in PSI best practises.
+* Cleanup in PSI best practices.
 
 # 9.6.5
 * Unset PLC_MACROS after loadPLCFile.cmd and loadPLCLib.cmd
diff --git a/startup.cmd b/startup.cmd
index f5eb27f7c..65cf29968 100644
--- a/startup.cmd
+++ b/startup.cmd
@@ -15,7 +15,7 @@
 #- SYS
 #-
 #- [optional]
-#- ECMC_VER          = 9.6.4
+#- ECMC_VER          = 9.6.6
 #- EthercatMC_VER    = 3.0.2 (obsolete)
 #- INIT              = initAll
 #- MASTER_ID         = 0 <-- put negatuve number to disable master, aka non ec-mode
@@ -54,7 +54,7 @@ on error halt
 #-
 #-------------------------------------------------------------------------------
 #- load required modules
-epicsEnvSet(ECMC_VER,${ECMC_VER=9.6.4})
+epicsEnvSet(ECMC_VER,${ECMC_VER=9.6.6})
 require ecmc "${ECMC_VER}"
 
 #- Require EthercatMC if used.