diff --git a/.ruff.toml b/.ruff.toml
index 8bb1f0a6..ff568d81 100644
--- a/.ruff.toml
+++ b/.ruff.toml
@@ -24,9 +24,9 @@ ignore = [
     "D202", # blank lines allowed after function docstring
     "D209", # multi-line docstring closing quote on newline
     "RUF009", # do not perform function call in dataclass defaults
-    "PLR0913", # too many arguments
     "D100", # missing docstring in public module
     "N805", # first argument of a method should be named `self`
+    "UP007", # new syntax for union type annotations based on the `|` operator
 ]
 
 line-length = 88
diff --git a/pyproject.toml b/pyproject.toml
index 456b0423..808e0237 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,8 +15,6 @@ classifiers = [
     "Development Status :: 1 - Planning",
     "Operating System :: POSIX :: Linux",
     "Programming Language :: Python :: 3.9",
-    "Programming Language :: Python :: 3.10",
-    "Programming Language :: Python :: 3.11",
     "License :: OSI Approved :: Apache Software License",
     "Topic :: Internet :: WWW/HTTP :: HTTP Servers",
     "Topic :: Software Development :: Libraries",
diff --git a/src/metldata/builtin_transformations/custom_embeddings/embedding_profile.py b/src/metldata/builtin_transformations/custom_embeddings/embedding_profile.py
index 3604d7cf..1a379789 100644
--- a/src/metldata/builtin_transformations/custom_embeddings/embedding_profile.py
+++ b/src/metldata/builtin_transformations/custom_embeddings/embedding_profile.py
@@ -18,6 +18,8 @@
 
 from __future__ import annotations
 
+from typing import Optional, Union
+
 from pydantic import BaseModel, Field
 
 
@@ -36,10 +38,10 @@ class EmbeddingProfile(BaseModel):
     source_class: str = Field(
         ..., description="The class to which the this embedding profile applies."
     )
-    description: str | None = Field(
+    description: Optional[str] = Field(
         ..., description="Description of the transformed class with embeddings."
     )
-    embedded_references: dict[str, str | EmbeddingProfile] = Field(
+    embedded_references: dict[str, Union[str, EmbeddingProfile]] = Field(
         ...,
         description=(
             "The references embedded into the target class."