diff --git a/src/NHibernate/NHibernate.csproj b/src/NHibernate/NHibernate.csproj
index 294821d6a1e..fa089313054 100644
--- a/src/NHibernate/NHibernate.csproj
+++ b/src/NHibernate/NHibernate.csproj
@@ -40,7 +40,7 @@
       <PrivateAssets>All</PrivateAssets>
     </PackageReference>
     <PackageReference Include="Antlr3.Runtime" Version="[3.5.1, 4.0)" />
-    <PackageReference Include="Iesi.Collections" Version="[4.0.3, 5.0)" />
+    <PackageReference Include="Iesi.Collections" Version="[4.0.4, 5.0)" />
     <PackageReference Include="Remotion.Linq" Version="[2.1.2, 3.0)" />
     <PackageReference Include="Remotion.Linq.EagerFetching" Version="[2.1.0, 3.0)" />
   </ItemGroup>