diff --git a/pyproject.toml b/pyproject.toml
index 0c01071..cd7e0d4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ requires-python = ">=3.10,<3.12"
 dynamic = ["version"]
 license = {file = "LICENSE.txt"}
 dependencies = [
-    "pydantic>=1,<2",
+    "pydantic>=1.9,<3",
     "coloredlogs>=14.0,<15.1",
     "arelle-release>=2.3,<2.13",
     "frictionless>=4.4,<5",
@@ -84,8 +84,8 @@ tests = [
     "pytest>=6.2,<7.5",  # Our testing framework
     "pytest-console-scripts>=1.1,<1.5",  # Allow automatic testing of scripts
     "pytest-cov>=2.10,<4.2",  # Pytest plugin for working with coverage
-    #"rstcheck[sphinx]>=5.0,<6.2",  # ReStructuredText linter
-    "tox>=4.0,<4.9",  # Python test environment manager
+    "rstcheck[sphinx]>=5.0,<6.2",  # ReStructuredText linter
+    "tox>=4.0,<4.7",  # Python test environment manager
 ]
 types = [
     "types-setuptools",
diff --git a/src/ferc_xbrl_extractor/arelle_interface.py b/src/ferc_xbrl_extractor/arelle_interface.py
index dcc97ec..473d7ce 100644
--- a/src/ferc_xbrl_extractor/arelle_interface.py
+++ b/src/ferc_xbrl_extractor/arelle_interface.py
@@ -88,7 +88,7 @@ class Metadata(BaseModel):
     name: str
     references: References
     calculations: list[Calculation]
-    balance: Literal["credit", "debit"] | None = None
+    balance: Literal["credit", "debit"] | None
 
     @classmethod
     def from_concept(cls, concept: ModelConcept) -> "Metadata":
diff --git a/src/ferc_xbrl_extractor/instance.py b/src/ferc_xbrl_extractor/instance.py
index ab91b8d..a318d48 100644
--- a/src/ferc_xbrl_extractor/instance.py
+++ b/src/ferc_xbrl_extractor/instance.py
@@ -6,7 +6,7 @@
 import stringcase
 from lxml import etree  # nosec: B410
 from lxml.etree import _Element as Element  # nosec: B410
-from pydantic import BaseModel, field_validator
+from pydantic import BaseModel, validator
 
 XBRL_INSTANCE = "http://www.xbrl.org/2003/instance"
 
@@ -20,7 +20,7 @@ class Period(BaseModel):
     """
 
     instant: bool
-    start_date: str | None = None
+    start_date: str | None
     end_date: str
 
     @classmethod
@@ -61,8 +61,7 @@ class Axis(BaseModel):
     value: str = ""
     dimension_type: DimensionType
 
-    @field_validator("name", mode="before")  # type: ignore
-    @classmethod
+    @validator("name", pre=True)  # type: ignore
     def strip_prefix(cls, name: str):  # noqa: N805
         """Strip XML prefix from name."""
         return name.split(":")[1] if ":" in name else name
@@ -195,7 +194,7 @@ class Fact(BaseModel):
 
     name: str
     c_id: str
-    value: str | None = None
+    value: str | None
 
     @classmethod
     def from_xml(cls, elem: Element) -> "Fact":
diff --git a/src/ferc_xbrl_extractor/taxonomy.py b/src/ferc_xbrl_extractor/taxonomy.py
index 901ceef..ba4f598 100644
--- a/src/ferc_xbrl_extractor/taxonomy.py
+++ b/src/ferc_xbrl_extractor/taxonomy.py
@@ -80,7 +80,7 @@ class Concept(BaseModel):
     type_: XBRLType = pydantic.Field(alias="type")
     period_type: Literal["duration", "instant"]
     child_concepts: "list[Concept]"
-    metadata: Metadata | None = None
+    metadata: Metadata | None
 
     @classmethod
     def from_list(cls, concept_list: list, concept_dict: ConceptDict) -> "Concept":
diff --git a/tox.ini b/tox.ini
index 9355080..1cb09bd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -67,12 +67,12 @@ skip_install = false
 extras =
     {[testenv:pre_commit]extras}
     {[testenv:bandit]extras}
-#   {[testenv:rstcheck]extras}
+    {[testenv:rstcheck]extras}
     {[testenv:flake8]extras}
 commands =
     {[testenv:pre_commit]commands}
     {[testenv:bandit]commands}
-#   {[testenv:rstcheck]commands}
+    {[testenv:rstcheck]commands}
     {[testenv:flake8]commands}
 
 #######################################################################################
@@ -91,11 +91,11 @@ description = Build the HTML docs from scratch using Sphinx.
 skip_install = false
 extras =
     {[testenv:doc8]extras}
-#   {[testenv:rstcheck]extras}
+    {[testenv:rstcheck]extras}
 commands =
     bash -c 'rm -rf docs/_build'
     {[testenv:doc8]commands}
-#   {[testenv:rstcheck]commands}
+    {[testenv:rstcheck]commands}
     sphinx-build -W -b html docs docs/_build/html
 
 #######################################################################################