diff --git a/app/fdroid-rules.pro b/app/fdroid-rules.pro
index 005da739..4d1f384d 100644
--- a/app/fdroid-rules.pro
+++ b/app/fdroid-rules.pro
@@ -26,3 +26,13 @@
 # Suppress warnings about missing classes if not all features are used
 -dontwarn java.lang.management.**
 -dontwarn sun.nio.ch.**
+
+-keep class com.google.api.client.http.** { *; }
+-dontwarn com.google.api.client.http.**
+
+# Keep Joda-Time classes used by Tink
+-keep class org.joda.time.** { *; }
+-dontwarn org.joda.time.**
+
+-keep class org.slf4j.** { *; }
+-dontwarn org.slf4j.**
\ No newline at end of file
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 59a77001..aaf1b2c2 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -45,3 +45,13 @@
 # Suppress warnings about missing classes if not all features are used
 -dontwarn java.lang.management.**
 -dontwarn sun.nio.ch.**
+
+-keep class com.google.api.client.http.** { *; }
+-dontwarn com.google.api.client.http.**
+
+# Keep Joda-Time classes used by Tink
+-keep class org.joda.time.** { *; }
+-dontwarn org.joda.time.**
+
+-keep class org.slf4j.** { *; }
+-dontwarn org.slf4j.**
diff --git a/versionCode.txt b/versionCode.txt
index d00491fd..d8263ee9 100644
--- a/versionCode.txt
+++ b/versionCode.txt
@@ -1 +1 @@
-1
+2
\ No newline at end of file