diff --git a/docs/requirements.txt b/docs/requirements.txt
index 58ad506be2..dd6554c2f2 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,8 +1,8 @@
 ansi2html==1.5.2
-mkdocs==1.1.0
-markdown==3.2.1
+mkdocs==1.1.2
+markdown==3.2.2
 mkdocs-exclude==1.0.2
-mkdocs-material==5.1.3
+mkdocs-material==5.1.7
 markdown-include==0.5.1
 pygments==2.6.1
 sqlalchemy   # pyup: ignore
diff --git a/pydantic/color.py b/pydantic/color.py
index fe10e1f5e1..97fc76bf50 100644
--- a/pydantic/color.py
+++ b/pydantic/color.py
@@ -312,11 +312,11 @@ def parse_float_alpha(value: Union[None, str, float, int]) -> Optional[float]:
         raise ColorError(reason='alpha values must be in the range 0 to 1')
 
 
-def parse_hsl(h: str, h_units: str, s: str, l: str, alpha: Optional[float] = None) -> RGBA:
+def parse_hsl(h: str, h_units: str, sat: str, light: str, alpha: Optional[float] = None) -> RGBA:
     """
     Parse raw hue, saturation, lightness and alpha values and convert to RGBA.
     """
-    s_value, l_value = parse_color_value(s, 100), parse_color_value(l, 100)
+    s_value, l_value = parse_color_value(sat, 100), parse_color_value(light, 100)
 
     h_value = float(h)
     if h_units in {None, 'deg'}:
diff --git a/pydantic/error_wrappers.py b/pydantic/error_wrappers.py
index acbeb430dc..92d957f8d9 100644
--- a/pydantic/error_wrappers.py
+++ b/pydantic/error_wrappers.py
@@ -73,7 +73,7 @@ def display_errors(errors: List[Dict[str, Any]]) -> str:
 
 
 def _display_error_loc(error: Dict[str, Any]) -> str:
-    return ' -> '.join(str(l) for l in error['loc'])
+    return ' -> '.join(str(e) for e in error['loc'])
 
 
 def _display_error_type_and_ctx(error: Dict[str, Any]) -> str:
diff --git a/tests/requirements.txt b/tests/requirements.txt
index 7212639624..4a7a3ac94b 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1,13 +1,13 @@
 black==19.10b0
 coverage==5.1
 Cython==0.29.17;sys_platform!='win32'
-flake8==3.7.9
-flake8-quotes==3
+flake8==3.8.1
+flake8-quotes==3.2.0
 isort==4.3.21
 mypy==0.770
-pycodestyle==2.5.0
-pyflakes==2.1.1
-pytest==5.4.1
+pycodestyle==2.6.0
+pyflakes==2.2.0
+pytest==5.4.2
 pytest-cov==2.8.1
 pytest-mock==3.1.0
 pytest-sugar==0.9.3
diff --git a/tests/test_main.py b/tests/test_main.py
index fdbc9ea3f1..76e05b70ad 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -1049,7 +1049,7 @@ class NewModel(DerivedModel, something=2):
 
 def test_update_forward_refs_does_not_modify_module_dict():
     class MyModel(BaseModel):
-        field: Optional['MyModel']
+        field: Optional['MyModel']  # noqa: F821
 
     MyModel.update_forward_refs()
 
diff --git a/tests/test_networks.py b/tests/test_networks.py
index 16245a9dd5..b078d7729c 100644
--- a/tests/test_networks.py
+++ b/tests/test_networks.py
@@ -332,7 +332,7 @@ class Model(BaseModel):
 
 def test_custom_schemes():
     class Model(BaseModel):
-        v: stricturl(strip_whitespace=False, allowed_schemes={'ws', 'wss'})
+        v: stricturl(strip_whitespace=False, allowed_schemes={'ws', 'wss'})  # noqa: F821
 
     assert Model(v='ws://example.org').v == 'ws://example.org'
 
diff --git a/tests/test_types.py b/tests/test_types.py
index 892a17ab95..1b720d528f 100644
--- a/tests/test_types.py
+++ b/tests/test_types.py
@@ -519,7 +519,7 @@ def test_string_success():
     class MoreStringsModel(BaseModel):
         str_strip_enabled: constr(strip_whitespace=True)
         str_strip_disabled: constr(strip_whitespace=False)
-        str_regex: constr(regex=r'^xxx\d{3}$') = ...
+        str_regex: constr(regex=r'^xxx\d{3}$') = ...  # noqa: F722
         str_min_length: constr(min_length=5) = ...
         str_curtailed: constr(curtail_length=5) = ...
         str_email: EmailStr = ...
@@ -548,7 +548,7 @@ class MoreStringsModel(BaseModel):
 @pytest.mark.skipif(not email_validator, reason='email_validator not installed')
 def test_string_fails():
     class MoreStringsModel(BaseModel):
-        str_regex: constr(regex=r'^xxx\d{3}$') = ...
+        str_regex: constr(regex=r'^xxx\d{3}$') = ...  # noqa: F722
         str_min_length: constr(min_length=5) = ...
         str_curtailed: constr(curtail_length=5) = ...
         str_email: EmailStr = ...