diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index b102efa..c659161 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -10,11 +10,11 @@ jobs:
       matrix:
         # windows-latest async does not support it for now
         operating-system: [macos-latest, ubuntu-latest]
-        ocaml-version: [ '4.14.0', '4.08.1' ]
+        ocaml-version: [ '5.2.0', '4.14.0' ]
     steps:
     - uses: actions/checkout@master
     - name: Setup Python
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v5
       with:
         python-version: '3.x'
     - name: Cache pip
@@ -29,7 +29,7 @@ jobs:
     - name: Install Python dependencies
       run: pip install pylint pycodestyle
     - name: Install OCaml
-      uses: ocaml/setup-ocaml@v2
+      uses: ocaml/setup-ocaml@v3
       with:
         ocaml-compiler: ${{ matrix.ocaml-version }}
     - name: Install OCaml dependencies
diff --git a/src/lib/pythongen.ml b/src/lib/pythongen.ml
index 70fbb74..aadaf70 100644
--- a/src/lib/pythongen.ml
+++ b/src/lib/pythongen.ml
@@ -98,8 +98,9 @@ class ListAction(argparse.Action):
 
 let compat_block =
   [ Line "get_str = str"
-  ; Line "if sys.version_info[0] > 2:"
-  ; Block [ Line "long = int"; Line "unicode = str"; Line "str = bytes" ]
+  ; Line "long = int"
+  ; Line "unicode = str"
+  ; Line "str = bytes"
   ; Line ""
   ]
 
@@ -699,6 +700,7 @@ let commandline_parse _ (BoxedFunction m) =
                    | Basic Int32 -> ", type=int"
                    | Basic Bool -> ", type=lambda x: json.loads(x.lower())"
                    | Basic Float -> ", type=float"
+                   | Variant _ -> ", type=json.loads"
                    | _ -> "")))
           inputs
       @ [ Line "return vars(parser.parse_args())" ])