diff --git a/Iceshrimp.Backend/Iceshrimp.Backend.csproj b/Iceshrimp.Backend/Iceshrimp.Backend.csproj
index b8ef975b..a1019eb5 100644
--- a/Iceshrimp.Backend/Iceshrimp.Backend.csproj
+++ b/Iceshrimp.Backend/Iceshrimp.Backend.csproj
@@ -56,6 +56,7 @@
     <ItemGroup>
         <PackageReference Include="System.Private.Uri" Version="4.3.2" />
         <PackageReference Include="System.Formats.Asn1" Version="8.0.1" />
+        <PackageReference Include="MessagePack" Version="2.5.187" />
     </ItemGroup>
 
     <!-- If the build flag BundleNativeDeps is set, reference the LibVips native dependecy -->
diff --git a/Iceshrimp.Frontend/Iceshrimp.Frontend.csproj b/Iceshrimp.Frontend/Iceshrimp.Frontend.csproj
index cb276505..3e1eda29 100644
--- a/Iceshrimp.Frontend/Iceshrimp.Frontend.csproj
+++ b/Iceshrimp.Frontend/Iceshrimp.Frontend.csproj
@@ -37,6 +37,11 @@
         <PackageReference Include="Iceshrimp.Assets.PhosphorIcons" Version="2.1.1" />
     </ItemGroup>
 
+    <!-- Transitive dependency version overrides to patch security vulnerabilities -->
+    <ItemGroup>
+        <PackageReference Include="MessagePack" Version="2.5.187" />
+    </ItemGroup>
+
     <ItemGroup>
         <EmbeddedResource Update="Localization\Localization.resx">
             <Generator>ResXFileCodeGenerator</Generator>