diff --git a/lib/koans/19_genservers.ex b/lib/koans/19_genservers.ex
index e9a1bb7..8ad4589 100644
--- a/lib/koans/19_genservers.ex
+++ b/lib/koans/19_genservers.ex
@@ -119,13 +119,13 @@ defmodule GenServers do
 
   koan "The handle_cast callback handles asynchronous messages" do
     {:ok, pid} = GenServer.start_link(Laptop, "3kr3t!")
-    GenServer.cast(pid, {:change_password, "3kr3t!", "Hello"})
+    GenServer.cast(pid, {:change_password, "3kr3t!", "73x7!n9"})
     assert GenServer.call(pid, :get_password) == ___
   end
 
   koan "Handlers can also return error responses" do
     {:ok, pid} = GenServer.start_link(Laptop, "3kr3t!")
-    assert GenServer.call(pid, {:unlock, 2017}) == ___
+    assert GenServer.call(pid, {:unlock, "81u3pr!n7"}) == ___
   end
 
   koan "Referencing processes by their PID gets old pretty quickly, so let's name them" do
diff --git a/test/koans/genservers_koans_test.exs b/test/koans/genservers_koans_test.exs
index 908c080..b8cae92 100644
--- a/test/koans/genservers_koans_test.exs
+++ b/test/koans/genservers_koans_test.exs
@@ -9,7 +9,7 @@ defmodule GenServersTests do
       "3kr3t!",
       {:multiple, ["Apple Inc.", "MacBook Pro"]},
       {:multiple, [["2.9 GHz Intel Core i5"], 8192, :intel_iris_graphics]},
-      "Hello",
+      "73x7!n9",
       {:error, "Incorrect password!"},
       "Congrats! Your process was successfully named.",
       {:ok, "Laptop unlocked!"},