diff --git a/Changelog.md b/Changelog.md
index 8a17e79..66fb4ad 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -6,6 +6,10 @@ Here's the full changelog:
 ```
 * Nerd_STF
     * Mathematics
+        * NumberSystems
+            * Complex
+                + operator Complex(SystemComplex)
+                + operator SystemComplex(Complex)
         * Float3
             = Added a setter to `XY`
             = Added a setter to `XZ`
diff --git a/Nerd_STF/Mathematics/NumberSystems/Complex.cs b/Nerd_STF/Mathematics/NumberSystems/Complex.cs
index 6727473..5f1da3e 100644
--- a/Nerd_STF/Mathematics/NumberSystems/Complex.cs
+++ b/Nerd_STF/Mathematics/NumberSystems/Complex.cs
@@ -1,4 +1,6 @@
-namespace Nerd_STF.Mathematics.NumberSystems;
+using SystemComplex = System.Numerics.Complex;
+
+namespace Nerd_STF.Mathematics.NumberSystems;
 
 public record struct Complex(float u, float i) : IAbsolute<Complex>, IAverage<Complex>, ICeiling<Complex>,
     IClampMagnitude<Complex, float>, IComparable<Complex>, IDivide<Complex>, IDot<Complex, float>,
@@ -204,4 +206,7 @@ public record struct Complex(float u, float i) : IAbsolute<Complex>, IAverage<Co
     public static implicit operator Complex(Fill<float> fill) => new(fill);
     public static implicit operator Complex(Fill<int> fill) => new(fill);
     public static implicit operator Complex((float u, float i) val) => new(val.u, val.i);
+
+    public static implicit operator Complex(SystemComplex val) => ((float)val.Real, (float)val.Imaginary);
+    public static implicit operator SystemComplex(Complex val) => new(val.u, val.i);
 }
diff --git a/Nerd_STF/Mathematics/NumberSystems/Quaternion.cs b/Nerd_STF/Mathematics/NumberSystems/Quaternion.cs
index 9dd6991..06f5eb7 100644
--- a/Nerd_STF/Mathematics/NumberSystems/Quaternion.cs
+++ b/Nerd_STF/Mathematics/NumberSystems/Quaternion.cs
@@ -1,4 +1,6 @@
-namespace Nerd_STF.Mathematics.NumberSystems;
+using SystemQuaternion = System.Numerics.Quaternion;
+
+namespace Nerd_STF.Mathematics.NumberSystems;
 
 public record struct Quaternion(float u, float i, float j, float k) : IAbsolute<Quaternion>, IAverage<Quaternion>,
     ICeiling<Quaternion>, IClamp<Quaternion>, IClampMagnitude<Quaternion, float>, IComparable<Quaternion>,
@@ -332,4 +334,7 @@ public record struct Quaternion(float u, float i, float j, float k) : IAbsolute<
     public static implicit operator Quaternion(Fill<int> fill) => new(fill);
     public static implicit operator Quaternion((float u, float i, float j, float k) val) =>
         new(val.u, val.i, val.j, val.k);
+
+    public static implicit operator Quaternion(SystemQuaternion val) => (val.X, val.Y, val.Z, val.W);
+    public static implicit operator SystemQuaternion(Quaternion val) => new(val.u, val.i, val.j, val.k);
 }
diff --git a/Nerd_STF/Nerd_STF.csproj b/Nerd_STF/Nerd_STF.csproj
index ed9ea85..7f0aed6 100644
--- a/Nerd_STF/Nerd_STF.csproj
+++ b/Nerd_STF/Nerd_STF.csproj
@@ -12,7 +12,7 @@
     <Copyright>Copyright (c) 2023 That_One_Nerd</Copyright>
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <RepositoryUrl>https://github.com/That-One-Nerd/Nerd_STF</RepositoryUrl>
-    <AssemblyVersion>2.5.0</AssemblyVersion>
+    <AssemblyVersion>2.4.1</AssemblyVersion>
     <PackageTags>c#;csharp;c sharp;math;mathematics;mathametics;maths;color;rgb;rgba;cmyk;cmyka;hsv;hsva;calculus;linear algebra;linalg;linearalgebra;matrix;matrix2x2;matrix 2x2;matrix3x3;matrix 3x3;matrix4x4;matrix 4x4;matrix multiplication;vector;vector2d;vector3d;vector2;vector3;float2;float3;float4;int2;int3;int4;angle;geometry;vert;line;polygon;triangle;quadrilateral;sphere;circle;number system;numbersystem;complex numbers;complex;2d numbers;2dnumbers;quaternions;4d numbers;4dnumbers</PackageTags>
     <Version>2.4.1</Version>
     <Product>Nerd_STF</Product>