diff --git a/src/pdm/cli/commands/list.py b/src/pdm/cli/commands/list.py
index 19fbef8c35..7fd3556a75 100644
--- a/src/pdm/cli/commands/list.py
+++ b/src/pdm/cli/commands/list.py
@@ -234,7 +234,7 @@ def _group_of(name: str) -> set[str]:
             keys = parse_comma_separated_string(options.sort)
             if not all(key in Listable.KEYS for key in keys):
                 raise PdmUsageError(f"--sort key must be one of: {','.join(Listable.KEYS)}")
-            records.sort(key=lambda d: tuple(d[key] for key in keys))
+            records.sort(key=lambda d: tuple(d[key].lower() for key in keys))
 
         # Write CSV
         if options.csv:
diff --git a/tests/cli/test_list.py b/tests/cli/test_list.py
index c0978df067..1c2fba5f86 100644
--- a/tests/cli/test_list.py
+++ b/tests/cli/test_list.py
@@ -430,7 +430,7 @@ def test_list_bare(project, pdm):
 @mock.patch("pdm.termui.ROUNDED", ASCII)
 @pytest.mark.usefixtures("working_set")
 def test_list_bare_sorted_name(project, pdm):
-    pdm(["add", "requests"], obj=project, strict=True)
+    pdm(["add", "requests", "pyyaml"], obj=project, strict=True)
     result = pdm(["list", "--sort", "name"], obj=project)
     expected = (
         "+--------------------------------------+\n"
@@ -439,6 +439,7 @@ def test_list_bare_sorted_name(project, pdm):
         "| certifi      | 2018.11.17 |          |\n"
         "| chardet      | 3.0.4      |          |\n"
         "| idna         | 2.7        |          |\n"
+        "| PyYAML       | 6.0        |          |\n"
         "| requests     | 2.19.1     |          |\n"
         "| test-project | 0.0.0      |          |\n"
         "| urllib3      | 1.22       |          |\n"
diff --git a/tests/fixtures/pypi.json b/tests/fixtures/pypi.json
index 1c472b4402..f7b899970e 100644
--- a/tests/fixtures/pypi.json
+++ b/tests/fixtures/pypi.json
@@ -60,5 +60,6 @@
     "1.0": {
       "dependencies": ["django<2"]
     }
-  }
+  },
+  "PyYAML": { "6.0": {} }
 }