diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 9033659..0196821 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.6, 3.7, 3.8, 3.9, "3.10"]
 
     steps:
       - uses: actions/checkout@v2
diff --git a/Makefile b/Makefile
index f9c5949..310adff 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@ target_dirs := tests coqpit
 
 
 test:	## run tests.
-	nosetests -x --with-cov -cov  --cover-erase --cover-package coqpit tests --nologcapture --nocapture
+	coverage run -m pytest && coverage report --show-missing
 
 style:	## update code style.
 	black ${target_dirs}
diff --git a/coqpit/coqpit.py b/coqpit/coqpit.py
index 07cd423..5cc590f 100644
--- a/coqpit/coqpit.py
+++ b/coqpit/coqpit.py
@@ -408,7 +408,7 @@ def deserialize(self, data: dict) -> "Serializable":
                 init_kwargs[field.name] = value
                 continue
             if value == MISSING:
-                raise ValueError("deserialized with unknown value for {} in {}".format(field.name, self.__name__))
+                raise ValueError(f"deserialized with unknown value for {field.name} in {self.__name__}")
             value = _deserialize(value, field.type)
             init_kwargs[field.name] = value
         for k, v in init_kwargs.items():
@@ -438,7 +438,7 @@ def deserialize_immutable(cls, data: dict) -> "Serializable":
                 init_kwargs[field.name] = value
                 continue
             if value == MISSING:
-                raise ValueError("Deserialized with unknown value for {} in {}".format(field.name, cls.__name__))
+                raise ValueError(f"Deserialized with unknown value for {field.name} in {cls.__name__}")
             value = _deserialize(value, field.type)
             init_kwargs[field.name] = value
         return cls(**init_kwargs)
diff --git a/requirements_dev.txt b/requirements_dev.txt
index 31e6b4f..3d5e87b 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,4 +1,4 @@
 pylint
 black
-nose
+pytest
 coverage