diff --git a/CMakeLists.txt b/CMakeLists.txt
index ea1da5e..0a6f096 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -100,7 +100,7 @@ if (BUILD_PYTHON_INTERFACE OR BUILD_MATLAB_INTERFACE)
     include(FetchContent)
     FetchContent_Declare(
         cpu_features
-        URL https://github.com/google/cpu_features/archive/refs/tags/v0.9.0.zip
+	DOWNLOAD_COMMAND true
     )
     set(BUILD_SHARED_LIBS_COPY ${BUILD_SHARED_LIBS})
     set(BUILD_SHARED_LIBS OFF)
diff --git a/interfaces/c/tests/CMakeLists.txt b/interfaces/c/tests/CMakeLists.txt
index 010f038..c8f9ec4 100644
--- a/interfaces/c/tests/CMakeLists.txt
+++ b/interfaces/c/tests/CMakeLists.txt
@@ -13,18 +13,8 @@ if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.24.0")
 endif()
 
 # Google Test
-include(FetchContent)
-FetchContent_Declare(
-        googletest
-        URL https://github.com/google/googletest/archive/86add13493e5c881d7e4ba77fb91c1f57752b3a4.zip
-)
-# For Windows: Prevent overriding the parent project's compiler/linker settings
-set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
-FetchContent_GetProperties(googletest)
-if(NOT googletest_POPULATED)
-    FetchContent_Populate(googletest)
-    add_subdirectory(${googletest_SOURCE_DIR} ${googletest_BINARY_DIR} EXCLUDE_FROM_ALL)
-endif()
+# Use find_package to use the gtest package provided by Nix
+find_package(GTest REQUIRED)
 
 enable_testing()
 
diff --git a/interfaces/python/CMakeLists.txt b/interfaces/python/CMakeLists.txt
index f7415dc..885aeff 100644
--- a/interfaces/python/CMakeLists.txt
+++ b/interfaces/python/CMakeLists.txt
@@ -14,19 +14,7 @@ if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.24.0")
 endif()
 
 # Find pybind11
-include(FetchContent)
-FetchContent_Declare(
-    pybind11
-    URL https://github.com/pybind/pybind11/archive/refs/tags/v2.12.0.zip
-)
-FetchContent_MakeAvailable(pybind11)
-
-# detect arm64 cross compilation on macOS
-if(DEFINED ENV{_PYTHON_HOST_PLATFORM})
-    if($ENV{_PYTHON_HOST_PLATFORM} MATCHES "arm64")
-        set(CMAKE_SYSTEM_PROCESSOR "arm64")
-    endif()
-endif()
+find_package(pybind11 REQUIRED)
 
 # add instruction set detection on x86/amd64
 pybind11_add_module(instruction_set src/instruction_set.cpp)
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index d11bd37..2275a62 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -14,18 +14,8 @@ if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.24.0")
 endif()
 
 # Google Test
-include(FetchContent)
-FetchContent_Declare(
-        googletest
-        URL https://github.com/google/googletest/archive/86add13493e5c881d7e4ba77fb91c1f57752b3a4.zip
-)
-# For Windows: Prevent overriding the parent project's compiler/linker settings
-set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
-FetchContent_GetProperties(googletest)
-if(NOT googletest_POPULATED)
-    FetchContent_Populate(googletest)
-    add_subdirectory(${googletest_SOURCE_DIR} ${googletest_BINARY_DIR} EXCLUDE_FROM_ALL)
-endif()
+# Use find_package to use the gtest package provided by Nix
+find_package(GTest REQUIRED)
 
 enable_testing()