diff --git a/serial_lib/build.gradle b/serial_lib/build.gradle
index 367bbaa..4e272ee 100755
--- a/serial_lib/build.gradle
+++ b/serial_lib/build.gradle
@@ -7,8 +7,8 @@ android {
     defaultConfig {
         minSdkVersion 21
         targetSdkVersion 29
-        versionCode 317
-        versionName "3.1.7"
+        versionCode 316
+        versionName "3.1.6"
         externalNativeBuild {
             cmake {
                 arguments '-DANDROID_TOOLCHAIN=clang'