diff --git a/ChangeLog.txt b/ChangeLog.txt
index 83163eb..f7071c4 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -1,3 +1,6 @@
+2021-02-20: Version 1.85
+- Update to Stockfish 13.
+
 2020-10-03: Version 1.84
 - Update Stockfish to development version 280920.
 - Improve move probability calculation for CTG books.
diff --git a/DroidFishApp/build.gradle b/DroidFishApp/build.gradle
index 4ba30ac..ba331c0 100644
--- a/DroidFishApp/build.gradle
+++ b/DroidFishApp/build.gradle
@@ -6,8 +6,8 @@ android {
         applicationId "org.petero.droidfish"
         minSdkVersion 16
         targetSdkVersion 28
-        versionCode 94
-        versionName "1.84"
+        versionCode 95
+        versionName "1.85"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         externalNativeBuild {
             ndkBuild {