diff --git a/pkgs/tools/admin/aws-encryption-sdk-cli/default.nix b/pkgs/tools/admin/aws-encryption-sdk-cli/default.nix
index 2bc331cc1874..f0d5aa5d3915 100644
--- a/pkgs/tools/admin/aws-encryption-sdk-cli/default.nix
+++ b/pkgs/tools/admin/aws-encryption-sdk-cli/default.nix
@@ -37,6 +37,7 @@ localPython.pkgs.buildPythonApplication rec {
     aws-encryption-sdk
     base64io
     urllib3
+    setuptools # for pkg_resources
   ];
 
   doCheck = true;
@@ -52,6 +53,9 @@ localPython.pkgs.buildPythonApplication rec {
     "test/integration"
   ];
 
+  # Upstream did not adapt to pytest 8 yet.
+  pytestFlagsArray = [ "-W" "ignore::pytest.PytestRemovedIn8Warning" ];
+
   passthru = {
     updateScript = nix-update-script { };
     tests.version = testers.testVersion {