diff --git a/CHANGELOG.md b/CHANGELOG.md
index fc78ffd..3c51a85 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,12 @@ and this project adheres to
 ### Changed
 
 - Updated l9format requirement from =1.3.2 to =1.4.0 ([ae676d9])
+- Updated l9format requirement from =1.4.0 to =2.0.0 ([df916e5], [#68])
+
+### Removed
+
+- Removed dependency on serde (unmaintained), replaced with dataclasses
+  and l9format.l9format.Model ([df916e5], [#68])
 
 ### Infrastructure
 
@@ -54,6 +60,7 @@ and this project adheres to
 [0.1.9]: https://github.com/LeakIX/LeakIXClient-Python/releases/tag/v0.1.9
 
 <!-- Commit links -->
+[df916e5]: https://github.com/LeakIX/LeakIXClient-Python/commit/df916e5
 [14bc55e]: https://github.com/LeakIX/LeakIXClient-Python/commit/14bc55e
 [a652654]: https://github.com/LeakIX/LeakIXClient-Python/commit/a652654
 [3967e42]: https://github.com/LeakIX/LeakIXClient-Python/commit/3967e42
@@ -70,3 +77,4 @@ and this project adheres to
 [#66]: https://github.com/LeakIX/LeakIXClient-Python/pull/66
 [#65]: https://github.com/LeakIX/LeakIXClient-Python/issues/65
 [#67]: https://github.com/LeakIX/LeakIXClient-Python/issues/67
+[#68]: https://github.com/LeakIX/LeakIXClient-Python/pull/68
diff --git a/leakix/client.py b/leakix/client.py
index dd4ead9..29353f7 100644
--- a/leakix/client.py
+++ b/leakix/client.py
@@ -1,3 +1,4 @@
+import dataclasses
 import json
 from enum import Enum
 from importlib.metadata import version
@@ -5,7 +6,7 @@
 
 import requests
 from l9format import l9format
-from serde import Model, fields
+from l9format.l9format import Model
 
 from leakix.domain import L9Subdomain
 from leakix.plugin import APIResult
@@ -23,9 +24,10 @@ class Scope(Enum):
     LEAK = "leak"
 
 
+@dataclasses.dataclass
 class HostResult(Model):
-    Services: fields.Optional(fields.List(fields.Nested(l9format.L9Event)))
-    Leaks: fields.Optional(fields.List(fields.Nested(l9format.L9Event)))
+    Services: list[l9format.L9Event] | None = None
+    Leaks: list[l9format.L9Event] | None = None
 
 
 DEFAULT_URL = "https://leakix.net"
diff --git a/leakix/domain.py b/leakix/domain.py
index d18ccc2..02360d2 100644
--- a/leakix/domain.py
+++ b/leakix/domain.py
@@ -1,7 +1,11 @@
-from serde import Model, fields
+import dataclasses
+from datetime import datetime
 
+from l9format.l9format import Model
 
+
+@dataclasses.dataclass
 class L9Subdomain(Model):
-    subdomain: fields.Str()
-    distinct_ips: fields.Int()
-    last_seen: fields.DateTime()
+    subdomain: str = ""
+    distinct_ips: int = 0
+    last_seen: datetime | None = None
diff --git a/leakix/plugin.py b/leakix/plugin.py
index da933f0..533f626 100644
--- a/leakix/plugin.py
+++ b/leakix/plugin.py
@@ -1,11 +1,13 @@
+import dataclasses
 from enum import Enum
 
-from serde import Model, fields
+from l9format.l9format import Model
 
 
+@dataclasses.dataclass
 class APIResult(Model):
-    name: fields.Str()
-    description: fields.Str()
+    name: str = ""
+    description: str = ""
 
 
 class Plugin(Enum):
diff --git a/pyproject.toml b/pyproject.toml
index fc142e5..c70a12d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ authors = [{ name = "Danny Willems", email = "danny@leakix.net" }]
 requires-python = ">=3.13"
 dependencies = [
     "requests",
-    "l9format==1.4.0",
+    "l9format==2.0.0",
     "fire>=0.5,<0.8",
 ]