diff --git a/.github/workflows/elixir.yml b/.github/workflows/elixir.yml
index 12e0a5e..33db0e1 100644
--- a/.github/workflows/elixir.yml
+++ b/.github/workflows/elixir.yml
@@ -18,10 +18,13 @@ jobs:
           - "1.13"
           - "1.14"
           - "1.15"
+          - "1.16"
+          - "1.17"
         otp:
           - "24"
           - "25"
           - "26"
+          - "27"
         include:
           - elixir: "1.15"
             otp: "26"
@@ -31,6 +34,16 @@ jobs:
             otp: "26"
           - elixir: "1.14"
             otp: "26"
+          - elixir: "1.13"
+            otp: "27"
+          - elixir: "1.14"
+            otp: "27"
+          - elixir: "1.15"
+            otp: "27"
+          - elixir: "1.16"
+            otp: "27"
+          - elixir: "1.17"
+            otp: "24"
 
     steps:
     - uses: actions/checkout@v2
diff --git a/lib/absinthe/plug/graphiql.ex b/lib/absinthe/plug/graphiql.ex
index ecd1e12..561e74d 100644
--- a/lib/absinthe/plug/graphiql.ex
+++ b/lib/absinthe/plug/graphiql.ex
@@ -321,7 +321,7 @@ defmodule Absinthe.Plug.GraphiQL do
 
   defp find_socket_path(conn, socket) do
     if endpoint = conn.private[:phoenix_endpoint] do
-      Enum.find_value(endpoint.__sockets__, :error, fn
+      Enum.find_value(endpoint.__sockets__(), :error, fn
         # Phoenix 1.4
         {path, ^socket, _opts} -> {:ok, path}
         # Phoenix <= 1.3