diff --git a/ruby/ext/google/protobuf_c/ruby-upb.h b/ruby/ext/google/protobuf_c/ruby-upb.h
index 3f6da09..9b92b33 100755
--- a/ruby/ext/google/protobuf_c/ruby-upb.h
+++ b/ruby/ext/google/protobuf_c/ruby-upb.h
@@ -1777,11 +1777,11 @@
 
 // Returns an array of extensions for this message.
 // Note: the array is ordered in reverse relative to the order of creation.
-const upb_Extension* _upb_Message_Getexts(const upb_Message* msg,
-                                          size_t* count);
+const upb_Extension* UPB_PRIVATE(_upb_Message_Getexts)(const upb_Message* msg,
+                                                       size_t* count);
 
-// Returns an extension for the given field number, or NULL if no extension
-// exists for this field number.
+// Returns an extension for a message with a given mini table,
+// or NULL if no extension exists with this mini table.
 const upb_Extension* _upb_Message_Getext(const upb_Message* msg,
                                          const upb_MiniTableExtension* ext);
 
@@ -12059,6 +12059,9 @@
 extern "C" {
 #endif
 
+const upb_Extension* upb_Message_ExtensionByIndex(const upb_Message* msg,
+                                                  size_t index);
+
 // Returns the extension with the given field number, or NULL on failure.
 const upb_Extension* upb_Message_FindExtensionByNumber(const upb_Message* msg,
                                                        uint32_t field_number);