First change didn't work. Take 2.

Simperium/src/main/java/com/simperium/android/AndroidClient.java

@@ -17,6 +17,7 @@
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.security.KeyManagementException;
 import java.security.KeyStore;
 import java.security.KeyStoreException;
 import java.security.NoSuchAlgorithmException;
@@ -25,6 +26,8 @@
 import java.util.concurrent.Executor;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ExecutorService;
+
+import javax.net.ssl.SSLContext;
 import javax.net.ssl.TrustManager;
 import javax.net.ssl.TrustManagerFactory;
 
@@ -82,11 +85,21 @@ public AndroidClient(Context context){
 
         mSessionId = String.format("%s-%s", Version.LIBRARY_NAME, sessionToken);
 
-        TrustManager[] trustManagers = new TrustManager[] {
-                buildPinnedTrustManager(context),
-                loadCertificate(context, R.raw.isrgrootx1),
-                loadCertificate(context, R.raw.isrgrootx2)
-        };
+        try {
+            final SSLContext sslContext = SSLContext.getInstance("TLS");
+            final TrustManager[] customTrustManagers = new TrustManager[]{
+                    loadCertificate(context, R.raw.isrgrootx1),
+                    loadCertificate(context, R.raw.isrgrootx2)
+            };
+            sslContext.init(null, customTrustManagers, null);
+            mHttpClient.getSSLSocketMiddleware().setSSLContext(sslContext);
+        } catch (NoSuchAlgorithmException e) {
+            Log.e(TAG, "Problem getting instance of SSLContext");
+        } catch (KeyManagementException e) {
+            Log.e(TAG, "Problem trying to init SSLContext");
+        }
+
+        TrustManager[] trustManagers = new TrustManager[] { buildPinnedTrustManager(context) };
         mHttpClient.getSSLSocketMiddleware().setTrustManagers(trustManagers);
 
     }