diff --git a/src/libWiiPy/archive/u8.py b/src/libWiiPy/archive/u8.py
index e485762..82d6147 100644
--- a/src/libWiiPy/archive/u8.py
+++ b/src/libWiiPy/archive/u8.py
@@ -57,7 +57,7 @@ class U8Archive:
     imet_header: IMETHeader
         The IMET header of the U8 archive, if one exists. Otherwise, an empty IMETHeader object.
     """
-    def __init__(self):
+    def __init__(self) -> None:
         self.u8_magic = b''
         self.u8_node_list: List[_U8Node] = []  # All the nodes in the header of a U8 file.
         self.file_name_list: List[str] = []
@@ -369,7 +369,7 @@ class IMETHeader:
     md5_hash : bytes
         MD5 sum of the entire header, with this field being all zeros during the hashing.
     """
-    def __init__(self):
+    def __init__(self) -> None:
         self.magic: str = ""  # Should always be "IMET"
         self.header_size: int = 0  # Always 1536? I assumed this would mean something, but it's just the header length.
         self.imet_version: int = 0  # Always 3?
diff --git a/src/libWiiPy/nand/setting.py b/src/libWiiPy/nand/setting.py
index d5a42ef..ac0b345 100644
--- a/src/libWiiPy/nand/setting.py
+++ b/src/libWiiPy/nand/setting.py
@@ -33,7 +33,7 @@ class SettingTxt:
     game : str
         Another region code, possibly set by the hidden region select channel.
     """
-    def __init__(self):
+    def __init__(self) -> None:
         self.area: str = ""
         self.model: str = ""
         self.dvd: int = 0
diff --git a/src/libWiiPy/nand/sys.py b/src/libWiiPy/nand/sys.py
index 750b9fb..1eb5d79 100644
--- a/src/libWiiPy/nand/sys.py
+++ b/src/libWiiPy/nand/sys.py
@@ -36,7 +36,7 @@ class UidSys:
         The entries stored in the uid.sys file.
     """
 
-    def __init__(self):
+    def __init__(self) -> None:
         self.uid_entries: List[_UidSysEntry] = []
 
     def load(self, uid_sys: bytes) -> None:
diff --git a/src/libWiiPy/title/cert.py b/src/libWiiPy/title/cert.py
index 3fd06b0..184830f 100644
--- a/src/libWiiPy/title/cert.py
+++ b/src/libWiiPy/title/cert.py
@@ -60,7 +60,7 @@ class Certificate:
     pub_key_exponent: int
         The exponent of this certificate's public key. Combined with the modulus to get the full key.
     """
-    def __init__(self):
+    def __init__(self) -> None:
         self.type: CertificateType = CertificateType.RSA_4096
         self.signature: bytes = b''
         self.issuer: str = ""
@@ -151,7 +151,7 @@ class CertificateChain:
     ticket_cert: Certificate
         The XS (Ticket) certificate from the chain.
     """
-    def __init__(self):
+    def __init__(self) -> None:
         self.ca_cert: Certificate = Certificate()
         self.tmd_cert: Certificate = Certificate()
         self.ticket_cert: Certificate = Certificate()
diff --git a/src/libWiiPy/title/content.py b/src/libWiiPy/title/content.py
index 944e9ec..78a4b17 100644
--- a/src/libWiiPy/title/content.py
+++ b/src/libWiiPy/title/content.py
@@ -34,7 +34,7 @@ class ContentRegion:
         The total number of contents stored in the region.
     """
 
-    def __init__(self):
+    def __init__(self) -> None:
         self.content_records: List[_ContentRecord] = []
         self.content_region_size: int = 0  # Size of the content region.
         self.num_contents: int = 0  # Number of contents in the content region.
@@ -525,7 +525,7 @@ class SharedContentMap:
         The shared content records stored in content.map.
     """
 
-    def __init__(self):
+    def __init__(self) -> None:
         self.shared_records: List[_SharedContentRecord] = []
 
     def load(self, content_map: bytes) -> None:
diff --git a/src/libWiiPy/title/iospatcher.py b/src/libWiiPy/title/iospatcher.py
index ea0658a..9d3b346 100644
--- a/src/libWiiPy/title/iospatcher.py
+++ b/src/libWiiPy/title/iospatcher.py
@@ -20,7 +20,7 @@ class IOSPatcher:
     dip_module_index : int
         The content index that DIP resides in and where DIP patches are applied. -1 if DIP patches are not applied.
     """
-    def __init__(self):
+    def __init__(self) -> None:
         self.title: Title = Title()
         self.es_module_index: int = -1
         self.dip_module_index: int = -1
diff --git a/src/libWiiPy/title/ticket.py b/src/libWiiPy/title/ticket.py
index dde151a..7abfc58 100644
--- a/src/libWiiPy/title/ticket.py
+++ b/src/libWiiPy/title/ticket.py
@@ -57,7 +57,7 @@ class Ticket:
     common_key_index : int
         The index of the common key required to decrypt this ticket's Title Key.
     """
-    def __init__(self):
+    def __init__(self) -> None:
         # If this is a dev ticket
         self.is_dev: bool = False  # Defaults to false, set to true during load if this ticket is using dev certs.
         # Signature blob header
diff --git a/src/libWiiPy/title/title.py b/src/libWiiPy/title/title.py
index 68d87c8..682866b 100644
--- a/src/libWiiPy/title/title.py
+++ b/src/libWiiPy/title/title.py
@@ -33,7 +33,7 @@ class Title:
     content: ContentRegion
         A ContentRegion object containing the title's contents.
     """
-    def __init__(self):
+    def __init__(self) -> None:
         self.wad: _WAD = _WAD()
         self.cert_chain: _CertificateChain = _CertificateChain()
         self.tmd: _TMD = _TMD()
diff --git a/src/libWiiPy/title/tmd.py b/src/libWiiPy/title/tmd.py
index f17fa9e..e2473ba 100644
--- a/src/libWiiPy/title/tmd.py
+++ b/src/libWiiPy/title/tmd.py
@@ -34,7 +34,7 @@ class TMD:
     num_contents : int
         The number of contents listed in the TMD.
     """
-    def __init__(self):
+    def __init__(self) -> None:
         self.blob_header: bytes = b''
         self.signature_type: bytes = b''
         self.signature: bytes = b''
diff --git a/src/libWiiPy/title/wad.py b/src/libWiiPy/title/wad.py
index 1a4be07..3d9a43d 100644
--- a/src/libWiiPy/title/wad.py
+++ b/src/libWiiPy/title/wad.py
@@ -29,7 +29,7 @@ class WAD:
     wad_meta_size : int
         The size of the WAD's meta/footer.
     """
-    def __init__(self):
+    def __init__(self) -> None:
         self.wad_hdr_size: int = 64
         self.wad_type: str = "Is"
         self.wad_version: bytes = b'\x00\x00'