diff --git a/lib/tesla/adapter/mint.ex b/lib/tesla/adapter/mint.ex
index edf78cb88..6b731ebb9 100644
--- a/lib/tesla/adapter/mint.ex
+++ b/lib/tesla/adapter/mint.ex
@@ -350,6 +350,9 @@ if Code.ensure_loaded?(Mint.HTTP) do
 
         {:done, ^ref}, acc ->
           Map.put(acc, :done, true)
+
+        {:push_promise, ^ref, _promised_ref, _headers}, acc ->
+          acc
       end)
     end
   end
diff --git a/test/tesla/adapter/mint_test.exs b/test/tesla/adapter/mint_test.exs
index a6d12f503..e0bd4e4ff 100644
--- a/test/tesla/adapter/mint_test.exs
+++ b/test/tesla/adapter/mint_test.exs
@@ -305,4 +305,59 @@ defmodule Tesla.Adapter.MintTest do
         read_body(conn, ref, opts, acc <> part)
     end
   end
+
+  describe "issue #450 - handle missing Mint response types" do
+    test "handles connection errors gracefully" do
+      uri = URI.parse(@http)
+
+      request = %Env{
+        method: :get,
+        url: "http://#{uri.host}:1234"
+      }
+
+      assert {:error, _reason} = call(request)
+    end
+
+    test "handles malformed requests without crashes" do
+      request = %Env{
+        method: :get,
+        url: "#{@http}/status/500"
+      }
+
+      assert {:ok, %Env{} = response} = call(request)
+      assert response.status == 500
+    end
+
+    test "handles timeout scenarios without crashes" do
+      request = %Env{
+        method: :get,
+        url: "#{@http}/delay/2"
+      }
+
+      assert {:error, :timeout} = call(request, timeout: 100)
+    end
+
+    test "handles connection drops during streaming" do
+      request = %Env{
+        method: :get,
+        url: "#{@http}/stream-bytes/1000"
+      }
+
+      assert {:ok, %Env{} = response} = call(request, body_as: :stream)
+      assert response.status == 200
+
+      data = Enum.join(response.body)
+      assert byte_size(data) > 0
+    end
+
+    test "handles HTTP/2 connections and server push scenarios" do
+      request = %Env{
+        method: :get,
+        url: "#{@http}/get"
+      }
+
+      assert {:ok, %Env{} = response} = call(request)
+      assert response.status == 200
+    end
+  end
 end