diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6e354bd..5dca72c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,13 @@
+# v0.2.0 (Sep 2023)
+
+## Additions
+
+- Add `NotUnique` and `InvalidKeyType` variants to `ErrorCode` enum.
+
+## Changes
+
+- Rename `UsageExceeded` error code to `KeyUsageExceeded`.
+
 # v0.1.0 (Aug 2023)
 
 ## Additions
diff --git a/Cargo.toml b/Cargo.toml
index d61f8e5..4b80fe0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "unkey"
 description = "An asynchronous Rust SDK for the Unkey API."
-version = "0.1.0"
+version = "0.2.0"
 edition = "2021"
 authors = ["Jonxslays"]
 readme = "README.md"
diff --git a/src/models/http.rs b/src/models/http.rs
index fb5c1d5..2203e81 100644
--- a/src/models/http.rs
+++ b/src/models/http.rs
@@ -22,12 +22,18 @@ pub enum ErrorCode {
     /// Not authorized for resource.
     Unauthorized,
 
-    /// You have exceeded your usage.
-    UsageExceeded,
+    /// The key has exceeded its usage.
+    KeyUsageExceeded,
 
     /// An internal server error occurred with the api.
     InternalServerError,
 
+    // An invalid key type was used (shouldn't happen usually).
+    InvalidKeyType,
+
+    // The identifier is in use by another resource.
+    NotUnique,
+
     /// Reserved for unknown interactions.
     #[serde(other)]
     Unknown,