diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5ac6941..bfd374d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ### Changed
 - Bump MSRV to 1.77.
+- Upgrade `ipnetwork` dependency from 0.20 to 0.21. This is a breaking change since
+  `ipnetwork` is part of the public API.
 
 
 ## [0.6.1] - 2024-10-02
diff --git a/Cargo.lock b/Cargo.lock
index 18be882..963d6ab 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -339,12 +339,9 @@ checksum = "ddc24109865250148c2e0f3d25d4f0f479571723792d3802153c60922a4fb708"
 
 [[package]]
 name = "ipnetwork"
-version = "0.20.0"
+version = "0.21.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bf466541e9d546596ee94f9f69590f89473455f88372423e0008fc1a7daf100e"
-dependencies = [
- "serde",
-]
+checksum = "cf370abdafd54d13e54a620e8c3e1145f28e46cc9d704bc6d94414559df41763"
 
 [[package]]
 name = "libc"
@@ -455,12 +452,6 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b42e15e59b18a828bbf5c58ea01debb36b9b096346de35d941dcb89009f24a0d"
 
-[[package]]
-name = "serde"
-version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "369633cfe0f0bde1dfc037fb6c5a329d46586a31f981bed14d87487a3439ae37"
-
 [[package]]
 name = "slab"
 version = "0.4.9"
diff --git a/Cargo.toml b/Cargo.toml
index a34a97e..fbcf0c5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,7 +19,7 @@ travis-ci = { repository = "mullvad/pfctl-rs" }
 ioctl-sys = "0.8.0"
 libc = "0.2.29"
 derive_builder = "0.20"
-ipnetwork = "0.20.0"
+ipnetwork = "0.21.1"
 
 [dev-dependencies]
 assert_matches = "1.1.0"