diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 16729fd..f8a6f57 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -6,7 +6,7 @@ on:
       - main
 jobs:
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     env:
       MIX_ENV: test
     strategy:
diff --git a/lib/esbuild.ex b/lib/esbuild.ex
index 701407b..ee59812 100644
--- a/lib/esbuild.ex
+++ b/lib/esbuild.ex
@@ -175,7 +175,7 @@ defmodule Esbuild do
 
     opts = [
       cd: config[:cd] || File.cwd!(),
-      env: config[:env] || %{},
+      env: normalize_env(config[:env] || %{}),
       into: IO.stream(:stdio, :line),
       stderr_to_stdout: true
     ]
@@ -324,4 +324,18 @@ defmodule Esbuild do
         end
     end
   end
+
+  defp normalize_env(env) do
+    Map.new(env, fn
+      {key, value} when is_list(value) -> {key, Enum.join(value, path_sep())}
+      other -> other
+    end)
+  end
+
+  defp path_sep do
+    case :os.type() do
+      {:win32, _} -> ";"
+      {:unix, _} -> ":"
+    end
+  end
 end