diff --git a/ci/azure/azure_template_posix.yml b/ci/azure/azure_template_posix.yml
index d0b50f3a5..2e6d313e2 100644
--- a/ci/azure/azure_template_posix.yml
+++ b/ci/azure/azure_template_posix.yml
@@ -28,6 +28,8 @@ jobs:
           NUMPY: 1.16.6
         python39_latest:
           python.version: '3.9'
+        python36_latest:
+          python.version: '3.6'
         python38_mid_conda:
           python.version: '3.8'
           use.conda: true
diff --git a/randomgen/tests/test_recent_numpy_changes.py b/randomgen/tests/test_recent_numpy_changes.py
index 9e4bf78f9..0562e5295 100644
--- a/randomgen/tests/test_recent_numpy_changes.py
+++ b/randomgen/tests/test_recent_numpy_changes.py
@@ -1,5 +1,3 @@
-from __future__ import annotations
-
 from distutils.version import LooseVersion
 from typing import cast
 
diff --git a/randomgen/typing.py b/randomgen/typing.py
index 6e27199c1..bf3eacb81 100644
--- a/randomgen/typing.py
+++ b/randomgen/typing.py
@@ -1,13 +1,22 @@
-from typing import TYPE_CHECKING, Any, Optional, Sequence, Union
+import sys
+from typing import TYPE_CHECKING, Optional, Sequence, Union
 
-if TYPE_CHECKING:
-    from typing import Literal
+from randomgen.seed_sequence import SeedSequence
 
-    SeedMode = Literal["sequence", "legacy"]
+if sys.version_info >= (3, 8):
+    from typing import Literal
+elif TYPE_CHECKING:
+    from typing_extensions import Literal
 else:
-    SeedMode = Any
 
-from randomgen.seed_sequence import SeedSequence
+    class _Literal:
+        def __getitem__(self, item):
+            pass
+
+    Literal = _Literal()
+
+SeedMode = Literal["sequence", "legacy"]
+
 
 __all__ = ["IntegerSequenceSeed", "SeedMode", "Size"]
 
diff --git a/randomgen/xoshiro256starstar.py b/randomgen/xoshiro256starstar.py
index 0c7cde4f5..59d14131f 100644
--- a/randomgen/xoshiro256starstar.py
+++ b/randomgen/xoshiro256starstar.py
@@ -1,5 +1,3 @@
-from __future__ import annotations
-
 from typing import Optional
 import warnings
 
diff --git a/randomgen/xoshiro512starstar.py b/randomgen/xoshiro512starstar.py
index eda1107b5..cb5b88207 100644
--- a/randomgen/xoshiro512starstar.py
+++ b/randomgen/xoshiro512starstar.py
@@ -1,5 +1,3 @@
-from __future__ import annotations
-
 from typing import Optional
 import warnings
 
diff --git a/requirements-dev.txt b/requirements-dev.txt
index acc919f30..9360def19 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,3 +1,4 @@
+black==21.4b1
 pytest>=6
 pytest-cov
 scipy>=1.3.2
\ No newline at end of file