diff --git a/README.md b/README.md
index 5656d1f..fc931f3 100644
--- a/README.md
+++ b/README.md
@@ -100,7 +100,7 @@ source env/bin/activate
 python3 -m pip install -r requirements-dev.txt
 
 ## Install locally
-pip install -e .
+pip install -e .[adlfs,azure,dev]
 
 ## Format code
 ./scripts/format
diff --git a/planetary_computer/sas.py b/planetary_computer/sas.py
index 0b6f311..05b97f3 100644
--- a/planetary_computer/sas.py
+++ b/planetary_computer/sas.py
@@ -43,10 +43,11 @@ class SASBase(BaseModel):
     expiry: datetime = Field(alias="msft:expiry")
     """RFC339 datetime format of the time this token will expire"""
 
-    class Config:
-        if _PYDANTIC_2_0:
-            populate_by_name = True
-        else:
+    if _PYDANTIC_2_0:
+        model_config = pydantic.ConfigDict(populate_by_name=True)
+    else:
+
+        class Config:
             allow_population_by_field_name = True
             json_encoders = {datetime: datetime_to_str}
 
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 70f407e..c07181e 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,7 +1,7 @@
 black==24.3.0
-flake8==4.0.1
+flake8==7.2.0
 ipdb==0.13.9
-mypy==0.961
+mypy==1.15.0
 types-requests==2.28.1
 setuptools==65.5.1
 pytest