diff --git a/NEWS.md b/NEWS.md
index b61d606c4c..1c7fc1f082 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,6 +1,24 @@
 MathOptInterface (MOI) release notes
 ====================================
 
+v0.9.21 (April 23, 2021)
+---------------------------
+
+For a detailed list of the closed issues and pull requests from this release,
+see the [tag notes](https://github.com/jump-dev/MathOptInterface.jl/releases/tag/v0.9.21).
+
+- Added `supports_shift_constant`.
+- Improve performance of bridging quadratic constraints.
+- Add precompilation statements.
+- Large improvements to the documentation.
+- Fix a variety of inference issues, benefiting precompilation and reducing
+  initial latency.
+- `RawParameter`s are now ignored when resetting a `CachingOptimizer`.
+  Previously, changing the underlying optimizer after `RawParameter`s were set
+  would throw an errror.
+- `Utilities.AbstractModel` is being refactored. This may break users
+  interacting with private fields of a model generated using `@model`.
+
 v0.9.20 (February 20, 2021)
 ---------------------------
 
diff --git a/Project.toml b/Project.toml
index edc6c1f008..23e999d043 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "MathOptInterface"
 uuid = "b8f27783-ece8-5eb3-8dc8-9495eed66fee"
-version = "0.9.20"
+version = "0.9.21"
 
 [deps]
 BenchmarkTools = "6e4b80f9-dd63-53aa-95a3-0cdb28fa8baf"