Depend on latest BoringSSL
diff --git a/gRPC.podspec b/gRPC.podspec
index 20db5cc..68d0fe4 100644
--- a/gRPC.podspec
+++ b/gRPC.podspec
@@ -732,7 +732,7 @@
 
     ss.requires_arc = false
     ss.libraries = 'z'
-    ss.dependency 'BoringSSL', '~> 2.0'
+    ss.dependency 'BoringSSL', '~> 3.0'
 
     # ss.compiler_flags = '-GCC_WARN_INHIBIT_ALL_WARNINGS', '-w'
   end