diff --git a/CHANGES.md b/CHANGES.md
index 92fafc2c..0a05f614 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,8 @@
 # Changes
 
+## 0.24.0
+- update to proj-sys 0.21.0
+
 ## 0.23.1
 - Update docs to refer to correct libproj version
 
diff --git a/Cargo.toml b/Cargo.toml
index da5ec463..218a8671 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "proj"
 description = "High-level Rust bindings for the latest stable version of PROJ"
-version = "0.23.1"
+version = "0.24.0"
 authors = [
     "The Georust Developers <mods@georust.org>"
 ]
@@ -13,7 +13,7 @@ readme = "README.md"
 edition = "2018"
 
 [dependencies]
-proj-sys = { version = "0.20.1", path = "proj-sys" }
+proj-sys = { version = "0.21.0", path = "proj-sys" }
 geo-types = { version = "0.7", optional = true }
 libc = "0.2.62"
 num-traits = "0.2.8"
diff --git a/proj-sys/CHANGES.md b/proj-sys/CHANGES.md
index ad095a8b..4eadcbc1 100644
--- a/proj-sys/CHANGES.md
+++ b/proj-sys/CHANGES.md
@@ -1,4 +1,4 @@
-# UNRELEASED
+# 0.21.0
 
 - BREAKING: Remove `bundled_proj_tiff` feature and assume system libproj has
   the default enabled tiff support. Otherwise, the current setup would
diff --git a/proj-sys/Cargo.toml b/proj-sys/Cargo.toml
index aace89d8..024686a7 100644
--- a/proj-sys/Cargo.toml
+++ b/proj-sys/Cargo.toml
@@ -2,7 +2,7 @@
 name = "proj-sys"
 description = "Rust bindings for PROJ v8.1.x"
 repository = "https://github.com/georust/proj"
-version = "0.20.1"
+version = "0.21.0"
 readme = "README.md"
 authors = ["The Georust developers <mods@georust.org>"]
 keywords = ["proj", "projection", "osgeo", "geo", "geospatial"]