diff --git a/build.gradle b/build.gradle
index 1a142a652..963ca0a8a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -15,7 +15,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.3.0'
+        classpath 'com.android.tools.build:gradle:3.3.1'
         classpath 'com.google.gms:google-services:4.2.0'
         // https://docs.fabric.io/android/changelog.html#fabric-gradle-plugin
         classpath 'io.fabric.tools:gradle:1.27.0'
diff --git a/dav4android b/dav4android
index ae28bd816..20d366435 160000
--- a/dav4android
+++ b/dav4android
@@ -1 +1 @@
-Subproject commit ae28bd816664aa0d3961cff3dac9f5d23f7d79db
+Subproject commit 20d36643553cf9b078d055b279166887bae4fddf
diff --git a/ical4android b/ical4android
index cd291d0f1..86968eb84 160000
--- a/ical4android
+++ b/ical4android
@@ -1 +1 @@
-Subproject commit cd291d0f1992fdd50d89b383111e092469411580
+Subproject commit 86968eb84783658620fac3c735df536094d88526