diff --git a/src/cfengine_cli/deptool.py b/src/cfengine_cli/deptool.py
index baefe41..43df25c 100644
--- a/src/cfengine_cli/deptool.py
+++ b/src/cfengine_cli/deptool.py
@@ -535,7 +535,7 @@ def comparison_md_table(self, refs, skip_unchanged=False):
         deps_data, _ = self.deps_dict(refs)
 
         # all dependencies, sorted by ref-existence, then name, in Python 3.7+
-        all_deps = deps_data.keys()
+        all_deps = sorted(deps_data.keys())
 
         compared_deps_data = collections.OrderedDict()
 
diff --git a/src/cfengine_cli/main.py b/src/cfengine_cli/main.py
index 8a38bab..ab936aa 100644
--- a/src/cfengine_cli/main.py
+++ b/src/cfengine_cli/main.py
@@ -80,7 +80,11 @@ def _get_arg_parser():
     dev_subparsers = dev_parser.add_subparsers(dest="dev_command")
     dev_subparsers.add_parser("update-dependency-tables")
     pdt = dev_subparsers.add_parser("print-dependency-tables")
-    pdt.add_argument("versions", nargs="*", help="Versions to compare")
+    pdt.add_argument(
+        "versions",
+        nargs="+",
+        help="Versions to compare (minimum 1 required)",
+    )
     dev_subparsers.add_parser("format-docs")
     dev_subparsers.add_parser("lint-docs")
     dev_subparsers.add_parser("generate-release-information")