diff --git a/clients/gax/mix.exs b/clients/gax/mix.exs
index b654b6cc49..247a8c0043 100644
--- a/clients/gax/mix.exs
+++ b/clients/gax/mix.exs
@@ -28,7 +28,7 @@ defmodule GoogleApi.Gax.MixProject do
     [
       {:tesla, "~> 1.2"},
       {:mime, "~> 1.0"},
-      {:poison, ">= 3.0.0 and < 5.0.0"},
+      {:poison, ">= 3.0.0 and < 7.0.0"},
       {:ex_doc, "~> 0.16", only: :dev},
       {:dialyxir, "~> 0.5", only: [:dev], runtime: false}
     ]
diff --git a/mix.exs b/mix.exs
index c9c83e5433..356a7f6d59 100644
--- a/mix.exs
+++ b/mix.exs
@@ -49,7 +49,7 @@ defmodule GoogleApis.Mixfile do
       {:oauth2, "~> 0.9"},
       {:temp, "~> 0.4"},
       {:jason, "~> 1.1"},
-      {:poison, "~> 3.1"}
+      {:poison, "~> 6.0"}
     ]
   end
 end