diff --git a/build.gradle b/build.gradle
index 764cc47..d0c3b05 100644
--- a/build.gradle
+++ b/build.gradle
@@ -29,7 +29,7 @@ dependencies {
 ext {
     tmpMarkdownInputDir = "${buildDir}/tmp/markdown-inputs".toString()
     htmlOutputDir = "${buildDir}/gen-html".toString()
-    pluginVersion = '1.6.5'
+    pluginVersion = '1.6.6'
 
     // Make sure |ext.pluginSinceBuild| is consistent with |intellij.version|.
     pluginSinceBuild = '203'
diff --git a/releasenotes.md b/releasenotes.md
index d779030..2a38c96 100644
--- a/releasenotes.md
+++ b/releasenotes.md
@@ -1,5 +1,11 @@
 # Release notes
 
+## Release notes for 1.6.6-203
+
+### General
+ * Use the IDE's bundled Kotlin library (fixes #270)
+
+
 ## Release notes for 1.6.5-203
 
 ### General