diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1c5cb5d..411a098 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,14 @@ Unreleased changes on the `development` branch.
 
 -
 
+## [0.31.1] — 2026-08-20
+
+### Fixed
+
+- **Version stamp.** The v0.31.0 release binary reported itself as `0.30.0`
+  because the version variables in `justfile` and `cmd/gasm/main.go` were not
+  bumped during the release commit.
+
 ## [0.31.0] — 2026-08-20
 
 The arm64 encoder (Phase 5 — complete) ships with ELF64 and GOOBJ emission,
diff --git a/cmd/gasm/main.go b/cmd/gasm/main.go
index 3d30654..b20fb18 100644
--- a/cmd/gasm/main.go
+++ b/cmd/gasm/main.go
@@ -34,7 +34,7 @@ import (
 
 // version is the release version, stamped at build time via
 // -ldflags "-X main.version=…" (defaulting to the current release).
-var version = "0.31.0"
+var version = "0.31.1"
 
 func main() {
 	if len(os.Args) < 2 {
diff --git a/justfile b/justfile
index 8d90768..487da17 100644
--- a/justfile
+++ b/justfile
@@ -3,7 +3,7 @@
 
 # gasm-devkit — developer tooling for Go's Plan 9 assembler (GAsm).
 
-version := "0.31.0"
+version := "0.31.1"
 
 default:
     @just --list