diff --git a/CHANGELOG.md b/CHANGELOG.md
index bd1da24a..a05bf421 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,11 @@ All notable changes to this project will be documented in this file.
 
 ## Unreleased
 
+## [0.9.0] - 2024-TBD
+
+ - **breaking**: Removed pub key field in ImageId. This accidentally
+   exposed the implementation detail of the image store (generational-arena),
+   which has been replaced with slotmap.
  - Bumped MSRV to 1.66.
 
 ## [0.8.2] - 2024-01-20
diff --git a/Cargo.toml b/Cargo.toml
index c59835c3..86f53d9b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "femtovg"
 description = "Antialiased 2D vector drawing library"
-version = "0.8.2"
+version = "0.9.0"
 license = "MIT/Apache-2.0"
 readme = "README.md"
 authors = [
@@ -25,7 +25,7 @@ bitflags = "2.0.2"
 rustybuzz = "0.11.0"
 unicode-bidi = "0.3.4"
 unicode-segmentation = "1.6.0"
-generational-arena = "0.2.8"
+slotmap = "1.0.7"
 lru = { version = "0.12.0", default-features = false }
 image = { version = "0.24.0", optional = true, default-features = false }
 serde = { version = "1.0", optional = true, features = ["derive", "rc"] }
diff --git a/src/image.rs b/src/image.rs
index a169a69c..fc345506 100644
--- a/src/image.rs
+++ b/src/image.rs
@@ -1,8 +1,8 @@
 use bitflags::bitflags;
-use generational_arena::{Arena, Index};
 use imgref::*;
 use rgb::alt::GRAY8;
 use rgb::*;
+use slotmap::{DefaultKey, SlotMap};
 
 #[cfg(feature = "image-loading")]
 use ::image::DynamicImage;
@@ -14,7 +14,7 @@ use crate::{ErrorKind, Renderer};
 
 /// An image handle.
 #[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd, Hash)]
-pub struct ImageId(pub Index);
+pub struct ImageId(DefaultKey);
 
 /// Image format: `Rgb8`, `Rgba8`, `Gray8`.
 #[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
@@ -182,7 +182,7 @@ impl ImageInfo {
     }
 }
 
-pub struct ImageStore<T>(Arena<(ImageInfo, T)>);
+pub struct ImageStore<T>(SlotMap<DefaultKey, (ImageInfo, T)>);
 
 impl<T> Default for ImageStore<T> {
     fn default() -> Self {
@@ -192,7 +192,7 @@ impl<T> Default for ImageStore<T> {
 
 impl<T> ImageStore<T> {
     pub fn new() -> Self {
-        Self(Arena::new())
+        Self(SlotMap::new())
     }
 
     pub fn alloc<R: Renderer<Image = T>>(&mut self, renderer: &mut R, info: ImageInfo) -> Result<ImageId, ErrorKind> {
diff --git a/src/text.rs b/src/text.rs
index f53ed274..a0be9481 100644
--- a/src/text.rs
+++ b/src/text.rs
@@ -11,9 +11,9 @@ use std::{
 };
 
 use fnv::{FnvBuildHasher, FnvHashMap, FnvHasher};
-use generational_arena::{Arena, Index};
 use lru::LruCache;
 use rustybuzz::ttf_parser;
+use slotmap::{DefaultKey, SlotMap};
 
 use unicode_bidi::BidiInfo;
 use unicode_segmentation::UnicodeSegmentation;
@@ -44,7 +44,7 @@ const DEFAULT_LRU_CACHE_CAPACITY: usize = 1000;
 
 /// A font handle.
 #[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd, Hash)]
-pub struct FontId(Index);
+pub struct FontId(DefaultKey);
 
 /// Text baseline vertical alignment:
 /// `Top`, `Middle`, `Alphabetic` (default), `Bottom`.
@@ -293,7 +293,7 @@ impl TextContext {
 }
 
 pub(crate) struct TextContextImpl {
-    fonts: Arena<Font>,
+    fonts: SlotMap<DefaultKey, Font>,
     shaping_run_cache: ShapingRunCache<FnvBuildHasher>,
     shaped_words_cache: ShapedWordsCache<FnvBuildHasher>,
 }