diff --git a/include/zeus/simd/parallelism_v2_simd.hpp b/include/zeus/simd/parallelism_v2_simd.hpp
index 5004a05..883ff74 100644
--- a/include/zeus/simd/parallelism_v2_simd.hpp
+++ b/include/zeus/simd/parallelism_v2_simd.hpp
@@ -659,7 +659,7 @@ public:
 #pragma GCC system_header
 #endif
 
-namespace athena::_simd {
+namespace zeus::_simd {
 
 enum class _StorageKind {
   _Scalar,
@@ -837,8 +837,8 @@ constexpr bool __vectorizable() {
          !std::is_same<_Tp, bool>::value;
 }
 
-} // namespace athena::_simd
-namespace athena::_simd::simd_abi {
+} // namespace zeus::_simd
+namespace zeus::_simd::simd_abi {
 
 using scalar = __simd_abi<_StorageKind::_Scalar, 1>;
 
@@ -851,8 +851,8 @@ inline constexpr size_t max_fixed_size = 32;
 template <class _Tp>
 using compatible = fixed_size<16 / sizeof(_Tp)>;
 
-} // namespace athena::_simd::simd_abi
-namespace athena::_simd {
+} // namespace zeus::_simd::simd_abi
+namespace zeus::_simd {
 
 template <class _Tp, class _Abi = simd_abi::compatible<_Tp>>
 class simd;
@@ -1528,4 +1528,4 @@ public:
   void __set(size_t __index, bool __val) noexcept { __storage_.set(__index, __val); }
 };
 
-} // namespace athena::_simd
+} // namespace zeus::_simd
diff --git a/include/zeus/simd/simd.hpp b/include/zeus/simd/simd.hpp
index c0d9577..6531af4 100644
--- a/include/zeus/simd/simd.hpp
+++ b/include/zeus/simd/simd.hpp
@@ -1,10 +1,10 @@
 #pragma once
-#define _ATHENA_SIMD_INCLUDED
+#define _ZEUS_SIMD_INCLUDED
 #ifdef __GNUC__
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wignored-attributes"
 #endif
-namespace athena::_simd {
+namespace zeus::_simd {
 using namespace std;
 }
 #include "parallelism_v2_simd.hpp"
@@ -18,13 +18,13 @@ using namespace std;
 #else
 namespace simd_abi {
 template <typename T>
-struct athena_native {};
+struct zeus_native {};
 template <>
-struct athena_native<float> {
+struct zeus_native<float> {
   using type = fixed_size<4>;
 };
 template <>
-struct athena_native<double> {
+struct zeus_native<double> {
   using type = fixed_size<4>;
 };
 } // namespace simd_abi
@@ -32,11 +32,11 @@ struct athena_native<double> {
 #ifdef __GNUC__
 #pragma GCC diagnostic pop
 #endif
-namespace athena {
+namespace zeus {
 template <typename T>
-using simd = _simd::simd<T, typename _simd::simd_abi::athena_native<T>::type>;
+using simd = _simd::simd<T, typename _simd::simd_abi::zeus_native<T>::type>;
 template <typename T>
 using simd_values = _simd::simd_data<simd<T>>;
 using simd_floats = simd_values<float>;
 using simd_doubles = simd_values<double>;
-} // namespace athena
+} // namespace zeus