diff --git a/mix.exs b/mix.exs
index 8812633..5ff1978 100644
--- a/mix.exs
+++ b/mix.exs
@@ -47,7 +47,9 @@ defmodule Excontainers.MixProject do
       # {:dep_from_hexpm, "~> 0.3.0"},
       # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
 
-      {:hackney, "~> 1.16"},
+      # Only ever reached through Tesla.Adapter.Hackney, so we mirror Tesla's own
+      # supported range: hackney 2.x/3.x/4.0.0/4.0.1 lack exports Tesla relies on.
+      {:hackney, "~> 1.16 or ~> 4.0 and >= 4.0.2"},
       {:jason, ">= 1.0.0"},
       {:tesla, "~> 1.4"},
       {:gestalt, "~> 1.0 or ~> 2.0"},