diff --git a/packages/cultmath/src/CultMath/CultMath.csproj b/packages/cultmath/src/CultMath/CultMath.csproj
index ed99c004..d3846d4f 100644
--- a/packages/cultmath/src/CultMath/CultMath.csproj
+++ b/packages/cultmath/src/CultMath/CultMath.csproj
@@ -10,7 +10,7 @@
     <PackageId>GameCult.Math</PackageId>
     <!-- MIT overall; math.Phacelle.cs and CultPhasor.cs (and the two Phacelle HLSL files) are MPL-2.0; math.Cycles.cs and CultMath.Cycles.hlsl are Apache-2.0. -->
     <PackageLicenseExpression>MIT AND MPL-2.0 AND Apache-2.0</PackageLicenseExpression>
-    <Version>0.5.0</Version>
+    <Version>0.5.1</Version>
     <Description>Clean-room C# math shaped for HLSL-style renderer code.</Description>
     <Authors>GameCult</Authors>
     <PackageReadmeFile>README.md</PackageReadmeFile>
diff --git a/packages/cultmath/unity/org.gamecult.cultmath/CHANGELOG.md b/packages/cultmath/unity/org.gamecult.cultmath/CHANGELOG.md
index 7edfa1b2..ebe21e7d 100644
--- a/packages/cultmath/unity/org.gamecult.cultmath/CHANGELOG.md
+++ b/packages/cultmath/unity/org.gamecult.cultmath/CHANGELOG.md
@@ -5,7 +5,7 @@ All notable changes to this package are documented in this file.
 Earlier releases (0.2.0-0.2.3) predate this package's changelog and are not
 backfilled here; see `docs/semver-policy.md` for why.
 
-## [Unreleased]
+## [0.5.1] - 2026-11-11
 
 ### Added
 
diff --git a/packages/cultmath/unity/org.gamecult.cultmath/Runtime/Plugins/CultMath.dll b/packages/cultmath/unity/org.gamecult.cultmath/Runtime/Plugins/CultMath.dll
index 205d3f9b..7757c254 100644
Binary files a/packages/cultmath/unity/org.gamecult.cultmath/Runtime/Plugins/CultMath.dll and b/packages/cultmath/unity/org.gamecult.cultmath/Runtime/Plugins/CultMath.dll differ
diff --git a/packages/cultmath/unity/org.gamecult.cultmath/Runtime/Plugins/CultMath.pdb b/packages/cultmath/unity/org.gamecult.cultmath/Runtime/Plugins/CultMath.pdb
index 9f865c09..e0991c71 100644
Binary files a/packages/cultmath/unity/org.gamecult.cultmath/Runtime/Plugins/CultMath.pdb and b/packages/cultmath/unity/org.gamecult.cultmath/Runtime/Plugins/CultMath.pdb differ
diff --git a/packages/cultmath/unity/org.gamecult.cultmath/package.json b/packages/cultmath/unity/org.gamecult.cultmath/package.json
index 20ffe196..e06e6c89 100644
--- a/packages/cultmath/unity/org.gamecult.cultmath/package.json
+++ b/packages/cultmath/unity/org.gamecult.cultmath/package.json
@@ -1,7 +1,7 @@
 {
   "name": "org.gamecult.cultmath",
   "displayName": "CultMath",
-  "version": "0.5.0",
+  "version": "0.5.1",
   "unity": "2021.3",
   "description": "Precompiled CultMath numeric primitives and matching HLSL semantics for GameCult Unity runtimes.",
   "license": "MIT AND MPL-2.0 AND Apache-2.0",
diff --git a/unity/org.gamecult.cultlib/README.md b/unity/org.gamecult.cultlib/README.md
index e118ac65..5fd83090 100644
--- a/unity/org.gamecult.cultlib/README.md
+++ b/unity/org.gamecult.cultlib/README.md
@@ -17,13 +17,13 @@ Install version `2.0.0` through Unity Package Manager with:
 https://github.com/GameCult/CultLib.git?path=/unity/org.gamecult.cultlib#cultlib-unity-v2.0.0
 ```
 
-The package depends on `org.gamecult.cultmath` (exactly 0.5.0) and does not
+The package depends on `org.gamecult.cultmath` (exactly 0.5.1) and does not
 carry its own `CultMath.dll`. Unity Package Manager resolves git packages only
 from the project manifest, so add CultMath beside CultLib in
 `Packages/manifest.json`:
 
 ```text
-"org.gamecult.cultmath": "https://github.com/GameCult/CultLib.git?path=/packages/cultmath/unity/org.gamecult.cultmath#cultmath-unity-v0.5.0"
+"org.gamecult.cultmath": "https://github.com/GameCult/CultLib.git?path=/packages/cultmath/unity/org.gamecult.cultmath#cultmath-unity-v0.5.1"
 ```
 
 CultMesh chooses mapped memory for reachable same-machine bodies and advertised
diff --git a/unity/org.gamecult.cultlib/package.json b/unity/org.gamecult.cultlib/package.json
index 19e42b58..9276e03a 100644
--- a/unity/org.gamecult.cultlib/package.json
+++ b/unity/org.gamecult.cultlib/package.json
@@ -4,7 +4,7 @@
   "version": "2.0.1",
   "unity": "2021.3",
   "dependencies": {
-    "org.gamecult.cultmath": "0.5.0"
+    "org.gamecult.cultmath": "0.5.1"
   },
   "description": "CultCache, CultNet, and CultMesh managed runtime assemblies for Unity.",
   "license": "MIT",