diff --git a/pyproject.toml b/pyproject.toml
index 56a8c850..4588686b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,6 @@ classifiers = []
 dependencies = [
     "attrs>=21.3.0",
     "cachetools>=4.2.1",
-    "deepdiff>=8.1.1",
     "ipython>6",
     "jsonschema",
     "networkx",
@@ -57,7 +56,14 @@ docs = [
     "pymdown-extensions",
 ]
 lint = ["ruff"]
-test = ["pytest", "pytest-cov", "pytest-env", "pytest-mock", "responses"]
+test = [
+    "deepdiff>=8.1.1",
+    "pytest",
+    "pytest-cov",
+    "pytest-env",
+    "pytest-mock",
+    "responses",
+]
 
 [tool.bumpversion]
 allow_dirty = false
diff --git a/tests/test_skeletons.py b/tests/test_skeletons.py
index 06773151..1291e7bc 100644
--- a/tests/test_skeletons.py
+++ b/tests/test_skeletons.py
@@ -1,4 +1,5 @@
 import copy
+
 import deepdiff
 import numpy as np
 import responses
diff --git a/uv.lock b/uv.lock
index fd15dc42..06e28b6f 100644
--- a/uv.lock
+++ b/uv.lock
@@ -343,6 +343,7 @@ bump = [
 ]
 dev = [
     { name = "bump-my-version" },
+    { name = "deepdiff" },
     { name = "mkdocs" },
     { name = "mkdocs-autorefs" },
     { name = "mkdocs-git-authors-plugin" },
@@ -384,6 +385,7 @@ lint = [
     { name = "ruff" },
 ]
 test = [
+    { name = "deepdiff" },
     { name = "pytest" },
     { name = "pytest-cov" },
     { name = "pytest-env" },
@@ -412,6 +414,7 @@ requires-dist = [
 bump = [{ name = "bump-my-version" }]
 dev = [
     { name = "bump-my-version" },
+    { name = "deepdiff", specifier = ">=8.1.1" },
     { name = "mkdocs" },
     { name = "mkdocs-autorefs" },
     { name = "mkdocs-git-authors-plugin" },
@@ -451,6 +454,7 @@ docs = [
 ]
 lint = [{ name = "ruff" }]
 test = [
+    { name = "deepdiff", specifier = ">=8.1.1" },
     { name = "pytest" },
     { name = "pytest-cov" },
     { name = "pytest-env" },