Prep for v1.31.1 (#4206)

Author: odow

Project.toml

@@ -1,6 +1,6 @@
 name = "JuMP"
 uuid = "4076af6c-e467-56ae-b986-b466b2749572"
-version = "1.31.0"
+version = "1.31.1"
 repo = "https://github.com/jump-dev/JuMP.jl.git"
 
 [deps]

docs/src/changelog.md

@@ -7,6 +7,15 @@ CurrentModule = JuMP
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Version v1.31.1 (July 23, 2026)
+
+### Fixed
+
+ - Temporarily revert the subexpression caching introduced in v1.31.0 because it
+   is subject to hash collisions. The two-argument [`moi_function`](@ref) is
+   maintained, and we hope to re-introduce the subexpression caching once we
+   work out the hashing issue. (#4205)
+
 ## Version v1.31.0 (July 21, 2026)
 
 ### Added