diff --git a/dialyzer.ignore b/dialyzer.ignore
deleted file mode 100644
index 8eaa21b..0000000
--- a/dialyzer.ignore
+++ /dev/null
@@ -1,5 +0,0 @@
-Unknown function 'Elixir.Jason.Encoder.Function':'__impl__'/1
-Unknown function 'Elixir.Jason.Encoder.PID':'__impl__'/1
-Unknown function 'Elixir.Jason.Encoder.Port':'__impl__'/1
-Unknown function 'Elixir.Jason.Encoder.Reference':'__impl__'/1
-Unknown function 'Elixir.Jason.Encoder.Tuple':'__impl__'/1
diff --git a/mix.exs b/mix.exs
index fbadd3a..ed8379b 100644
--- a/mix.exs
+++ b/mix.exs
@@ -44,7 +44,6 @@ defmodule Jason.Mixfile do
 
   defp dialyzer() do
     [
-      ignore_warnings: "dialyzer.ignore",
       plt_add_apps: [:decimal]
     ]
   end