diff --git a/test/run/test_mount.py b/test/run/test_mount.py
index 634fba1c..939add64 100755
--- a/test/run/test_mount.py
+++ b/test/run/test_mount.py
@@ -163,7 +163,7 @@ def test_all_options(tmpdir):
                 assert st.st_gid == 0
 
                 shortname_tested = False
-                proc = subprocess.run("mount", capture_output=True, check=True)
+                proc = subprocess.run("mount", stdout=subprocess.PIPE, check=True)
                 for line in proc.stdout.splitlines():
                     strline = line.decode("utf-8")
                     if mountpoint in strline:
diff --git a/test/run/test_stages.py b/test/run/test_stages.py
index 8ff0b62a..476625d6 100644
--- a/test/run/test_stages.py
+++ b/test/run/test_stages.py
@@ -325,7 +325,7 @@ class TestStages(test.TestBase):
 
                 qemu_img_run = subprocess.run(
                     ["qemu-img", "info", "--output=json", ip],
-                    capture_output=True,
+                    stdout=subprocess.PIPE,
                     check=True,
                     encoding="utf8"
                 )
@@ -490,7 +490,7 @@ class TestStages(test.TestBase):
             assert ovf_tree_file.attrib["{http://schemas.dmtf.org/ovf/envelope/1}size"] == str(os.stat(vmdk).st_size)
 
             ovf_tree_disk = ovf_tree_root[1][1]
-            res = subprocess.run(["qemu-img", "info", "--output=json", vmdk], check=True, capture_output=True)
+            res = subprocess.run(["qemu-img", "info", "--output=json", vmdk], check=True, stdout=subprocess.PIPE)
             capacity = ovf_tree_disk.attrib["{http://schemas.dmtf.org/ovf/envelope/1}capacity"]
             assert capacity == str(json.loads(res.stdout)["virtual-size"])
             pop_size = ovf_tree_disk.attrib["{http://schemas.dmtf.org/ovf/envelope/1}populatedSize"]
diff --git a/tools/osbuild-mpp b/tools/osbuild-mpp
index 8ac86346..81e4f654 100755
--- a/tools/osbuild-mpp
+++ b/tools/osbuild-mpp
@@ -360,7 +360,7 @@ class ImageManifest:
             src = f"docker://{imagename}"
 
         res = subprocess.run(["skopeo", "inspect", "--raw", src],
-                             capture_output=True,
+                             stdout=subprocess.PIPE,
                              check=True)
         m = ImageManifest(res.stdout)
         m.name = imagename