manually downgrade base64 to 0.1.1 to fix prod regression

You have already activated base64 0.1.1, but your Gemfile requires base64 0.2.0. Since base64 is a default gem

Gemfile.lock

@@ -163,7 +163,7 @@ GEM
     babel-transpiler (0.7.0)
       babel-source (>= 4.0, < 6)
       execjs (~> 2.0)
-    base64 (0.2.0)
+    base64 (0.1.1)
     bigdecimal (3.1.7)
     binding_of_caller (1.0.0)
       debug_inspector (>= 0.0.1)