diff --git a/CHANGELOG.md b/CHANGELOG.md
index d9a4dfe..1c27cb3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.2.2] - 2025-05-28
+### Fixed
+- Import `Eigen` to be able to calculate critical points for pure components and binary mixtures generically.  [#4](https://github.com/feos-org/feos-ad/pull/4)
+
 ## [0.2.1] - 2025-04-14
 ### Added
 - Added `StateAD::molar_isochoric_heat_capacity` and `StateAD::molar_isobaric_heat_capacity`. [#3](https://github.com/feos-org/feos-ad/pull/3)
diff --git a/Cargo.toml b/Cargo.toml
index a4c10b3..31283bc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "feos-ad"
-version = "0.2.1"
+version = "0.2.2"
 authors = ["Philipp Rehner <prehner@ethz.ch"]
 edition = "2021"
 readme = "README.md"
diff --git a/src/core/mod.rs b/src/core/mod.rs
index 54b3d84..dd3abda 100644
--- a/src/core/mod.rs
+++ b/src/core/mod.rs
@@ -10,7 +10,7 @@ mod state;
 mod total;
 pub use phase_equilibria::PhaseEquilibriumAD;
 pub use residual::{ParametersAD, ResidualHelmholtzEnergy};
-pub use state::StateAD;
+pub use state::{Eigen, StateAD};
 pub use total::{EquationOfStateAD, IdealGasAD, TotalHelmholtzEnergy};
 
 /// Used internally to implement the [Residual] and [IdealGas] traits from FeOs.
diff --git a/src/lib.rs b/src/lib.rs
index 349b8de..c039795 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,7 +2,7 @@ pub mod eos;
 
 mod core;
 pub use core::{
-    EquationOfStateAD, HelmholtzEnergyWrapper, IdealGasAD, NamedParameters, ParametersAD,
+    Eigen, EquationOfStateAD, HelmholtzEnergyWrapper, IdealGasAD, NamedParameters, ParametersAD,
     PhaseEquilibriumAD, ResidualHelmholtzEnergy, StateAD, TotalHelmholtzEnergy,
 };