diff --git a/riscemu/parser.py b/riscemu/parser.py
index d91c40f..eb06dc5 100644
--- a/riscemu/parser.py
+++ b/riscemu/parser.py
@@ -123,5 +123,5 @@ class AssemblyFileLoader(ProgramLoader):
         return 0.01
 
     @classmethod
-    def get_options(cls, argv: list[str]) -> [List[str], T_ParserOpts]:
+    def get_options(cls, argv: List[str]) -> [List[str], T_ParserOpts]:
         return argv, {}
diff --git a/riscemu/priv/ElfLoader.py b/riscemu/priv/ElfLoader.py
index f8538c6..199c2ed 100644
--- a/riscemu/priv/ElfLoader.py
+++ b/riscemu/priv/ElfLoader.py
@@ -34,7 +34,7 @@ class ElfBinaryFileLoader(ProgramLoader):
         return 0
 
     @classmethod
-    def get_options(cls, argv: list[str]) -> [List[str], T_ParserOpts]:
+    def get_options(cls, argv: List[str]) -> [List[str], T_ParserOpts]:
         return argv, {}
 
     def parse(self) -> Program:
diff --git a/riscemu/priv/ImageLoader.py b/riscemu/priv/ImageLoader.py
index 11f8fe7..de9341a 100644
--- a/riscemu/priv/ImageLoader.py
+++ b/riscemu/priv/ImageLoader.py
@@ -22,7 +22,7 @@ class MemoryImageLoader(ProgramLoader):
         return 0
 
     @classmethod
-    def get_options(cls, argv: list[str]) -> [List[str], T_ParserOpts]:
+    def get_options(cls, argv: List[str]) -> [List[str], T_ParserOpts]:
         return argv, {}
 
     def parse(self) -> Iterable[Program]:
diff --git a/riscemu/types/program_loader.py b/riscemu/types/program_loader.py
index e951749..65db90f 100644
--- a/riscemu/types/program_loader.py
+++ b/riscemu/types/program_loader.py
@@ -29,7 +29,7 @@ class ProgramLoader(ABC):
 
     @classmethod
     @abstractmethod
-    def get_options(cls, argv: list[str]) -> [List[str], T_ParserOpts]:
+    def get_options(cls, argv: List[str]) -> [List[str], T_ParserOpts]:
         """
         parse command line args into an options dictionary