diff --git a/dependencies.json b/dependencies.json
index d7b14d0a..b3302261 100644
--- a/dependencies.json
+++ b/dependencies.json
@@ -1,7 +1,11 @@
 {
     "*": {
         "*": [
+            "annotated-types",
+            "eval-type-backport",
             "more-itertools",
+            "pydantic",
+            "pydantic-core",
             "typing-extensions"
         ]
     }
diff --git a/requirements-dev.txt b/requirements-dev.txt
index cda14154..eb8c9033 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,16 +1,24 @@
 # This file was autogenerated by uv via the following command:
 #    uv pip compile requirements-dev.in -o requirements-dev.txt
+annotated-types==0.7.0
+    # via pydantic
 more-itertools==10.5.0
     # via -r requirements.in
 mypy==1.13.0
     # via -r requirements-dev.in
 mypy-extensions==1.0.0
     # via mypy
+pydantic==2.9.2
+    # via -r requirements.in
+pydantic-core==2.23.4
+    # via pydantic
 ruff==0.7.2
     # via -r requirements-dev.in
 typing-extensions==4.12.2
     # via
     #   -r requirements.in
     #   mypy
+    #   pydantic
+    #   pydantic-core
 vendorize==0.3.0
     # via -r requirements-dev.in
diff --git a/requirements.in b/requirements.in
index 04ff48f1..c5a1caf1 100644
--- a/requirements.in
+++ b/requirements.in
@@ -1,2 +1,3 @@
 more-itertools>=10,<11
+pydantic>=2,<3
 typing-extensions>=4.11
diff --git a/requirements.txt b/requirements.txt
index 1371ef71..43765ed9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,15 @@
 # This file was autogenerated by uv via the following command:
 #    uv pip compile requirements.in -o requirements.txt
+annotated-types==0.7.0
+    # via pydantic
 more-itertools==10.5.0
     # via -r requirements.in
-typing-extensions==4.12.2
+pydantic==2.9.2
     # via -r requirements.in
+pydantic-core==2.23.4
+    # via pydantic
+typing-extensions==4.12.2
+    # via
+    #   -r requirements.in
+    #   pydantic
+    #   pydantic-core