diff --git a/kobalt/src/Build.kt b/kobalt/src/Build.kt
index b691164c..20605040 100644
--- a/kobalt/src/Build.kt
+++ b/kobalt/src/Build.kt
@@ -25,7 +25,7 @@ val bs = buildScript {
 }
 
 object Versions {
-    val kotlin = "1.2.21"
+    val kotlin = "1.2.10"
     val okhttp = "3.9.0"
     val okio = "1.13.0"
     val retrofit = "2.3.0"
diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/Constants.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/Constants.kt
index 757dd6d1..0dba3e61 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/Constants.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/Constants.kt
@@ -9,7 +9,7 @@ object Constants {
     val BUILD_FILE_NAME = "Build.kt"
     val BUILD_FILE_DIRECTORY = "kobalt/src"
     val BUILD_FILE_PATH = KFiles.joinDir(BUILD_FILE_DIRECTORY, BUILD_FILE_NAME)
-    val KOTLIN_COMPILER_VERSION = "1.2.21"
+    val KOTLIN_COMPILER_VERSION = "1.2.10"
 
     internal val DEFAULT_REPOS = listOf<HostConfig>(
             //            "https://maven-central.storage.googleapis.com/",