diff --git a/stm-firmware/CMakeLists.txt b/stm-firmware/CMakeLists.txt
index 04f5a23..2eb28a8 100644
--- a/stm-firmware/CMakeLists.txt
+++ b/stm-firmware/CMakeLists.txt
@@ -1,7 +1,7 @@
 set(CMAKE_SYSTEM_NAME Generic)
 set(CMAKE_SYSTEM_PROCESSOR arm)
 set(CMAKE_CROSSCOMPILING 1)
-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.18)
 
 set(CMAKE_TOOLCHAIN_FILE "arm-none-eabi-gcc.cmake")
 
@@ -43,26 +43,12 @@ else (GIT_FOUND)
 	message("Version is set to: ${GIT_DESCRIBE}${ColorReset}")
 endif (GIT_FOUND)
 
-find_program(VIRTUALENV virtualenv)
-if (VIRTUALENV)
-	message("Python virtual environment found")
-	execute_process(
-		COMMAND ${VIRTUALENV} venv
-		WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
-		OUTPUT_QUIET
-		COMMAND_ERROR_IS_FATAL ANY
-	)
-	set(VENV_BIN "${CMAKE_CURRENT_BINARY_DIR}/venv/bin")
-	execute_process(
-		COMMAND ./pip install -r "${CMAKE_CURRENT_SOURCE_DIR}/crc-patcher/requirements.txt"
-		WORKING_DIRECTORY ${VENV_BIN}
-		OUTPUT_QUIET
-		COMMAND_ERROR_IS_FATAL ANY
-	)
-	message("${BoldGreen}python virtual environment set up!${ColorReset}")
-else(VIRTUALENV)
-	message(FATAL_ERROR "${BoldRed}Python virtual environment not set up: virtualenv: command not found!${ColorReset}")
-endif (VIRTUALENV)
+find_program(PATCHELFCRC patchelfcrc)
+if (PATCHELFCRC)
+	message("patchelfcrc found: ${PATCHELFCRC}")
+else(PATCHELFCRC)
+	message(FATAL_ERROR "${BoldRed}Patchelfcrc not found. Cannot patch CRC checksum into ELF file: patchelfcrc: command not found! See: https://git.shimatta.de/mhu/patchelfcrc${ColorReset}")
+endif (PATCHELFCRC)
 
 
 set(ELFFILE ${PROJECT_NAME}.elf)
@@ -131,8 +117,8 @@ target_include_directories(${ELFFILE} PRIVATE "${CMAKE_CURRENT_BINARY_DIR}/updat
 add_custom_command(
     TARGET ${ELFFILE}
     POST_BUILD
-    COMMAND ./python "${CMAKE_CURRENT_SOURCE_DIR}/crc-patcher/crc_patch_elf.py" "${CMAKE_CURRENT_BINARY_DIR}/${ELFFILE}"
-    WORKING_DIRECTORY ${VENV_BIN}
+    COMMAND ${PATCHELFCRC} --little-endian --verbose --granularity word --start-magic 0xa8be53f9 --end-magic 0xffa582ff -O .flashcrc -p crc-32-mpeg -S .text -S .data -S .ccmdata -S .vectors "${CMAKE_CURRENT_BINARY_DIR}/${ELFFILE}"
+    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
     COMMENT "Running Flash CRC Patcher"
     )