diff --git a/app/build.gradle b/app/build.gradle
index 63d2b94..f9fa6e6 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -10,8 +10,8 @@ android {
         applicationId "eu.rickvanschijndel.solargraph"
         minSdkVersion 16
         targetSdkVersion 27
-        versionCode 8
-        versionName "1.7"
+        versionCode 9
+        versionName "1.7.2"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 58d7787..c8a0189 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -46,3 +46,25 @@
 -keepattributes Signature
 # Retain declared checked exceptions for use by a Proxy instance.
 -keepattributes Exceptions
+
+## GSON
+# Gson uses generic type information stored in a class file when working with fields. Proguard
+# removes such information by default, so configure it to keep all of it.
+-keepattributes Signature
+
+# For using GSON @Expose annotation
+-keepattributes *Annotation*
+
+# Gson specific classes
+-dontwarn sun.misc.**
+#-keep class com.google.gson.stream.** { *; }
+
+# Application classes that will be serialized/deserialized over Gson
+-keep class eu.rickvanschijndel.solargraph.models.** { *; }
+
+# Prevent proguard from stripping interface information from TypeAdapterFactory,
+# JsonSerializer, JsonDeserializer instances (so they can be used in @JsonAdapter)
+-keep class * implements com.google.gson.TypeAdapterFactory
+-keep class * implements com.google.gson.JsonSerializer
+-keep class * implements com.google.gson.JsonDeserializer
+