diff --git a/pwndbg/color/syntax_highlight.py b/pwndbg/color/syntax_highlight.py
index 60eeb235..1c73090c 100644
--- a/pwndbg/color/syntax_highlight.py
+++ b/pwndbg/color/syntax_highlight.py
@@ -1,5 +1,7 @@
 import os.path
 import re
+from typing import Any
+from typing import Dict
 
 import pygments
 import pygments.formatters
@@ -20,7 +22,7 @@ style = theme.Parameter(
 
 formatter = pygments.formatters.Terminal256Formatter(style=str(style))
 pwntools_lexer = PwntoolsLexer()
-lexer_cache = {}
+lexer_cache: Dict[str, Any] = {}
 
 
 @pwndbg.config.Trigger([style])
diff --git a/pwndbg/commands/reload.py b/pwndbg/commands/reload.py
index bb25aae2..166b2769 100644
--- a/pwndbg/commands/reload.py
+++ b/pwndbg/commands/reload.py
@@ -1,15 +1,11 @@
 import types
+from imp import reload as _reload
 
 import pwndbg
 import pwndbg.commands
 import pwndbg.gdblib.events
 import pwndbg.lib.memoize
 
-try:
-    from __builtins__ import reload as _reload
-except Exception:
-    from imp import reload as _reload
-
 
 def rreload(module, mdict=None):
     """Recursively reload modules."""
diff --git a/pwndbg/gdblib/events.py b/pwndbg/gdblib/events.py
index b0dc6edf..1c4d50d8 100644
--- a/pwndbg/gdblib/events.py
+++ b/pwndbg/gdblib/events.py
@@ -7,6 +7,11 @@ by using a decorator.
 import sys
 from functools import partial
 from functools import wraps
+from typing import Any
+from typing import Callable
+from typing import Dict
+from typing import List
+from typing import Set
 
 import gdb
 
@@ -101,7 +106,7 @@ gdb.events.before_prompt = before_prompt_event
 
 # In order to support reloading, we must be able to re-fire
 # all 'objfile' and 'stop' events.
-registered = {
+registered: Dict[Any, List[Callable]] = {
     gdb.events.exited: [],
     gdb.events.cont: [],
     gdb.events.new_objfile: [],
@@ -122,7 +127,7 @@ except (NameError, AttributeError):
 # objects are loaded.  This greatly slows down the debugging session.
 # In order to combat this, we keep track of which objfiles have been loaded
 # this session, and only emit objfile events for each *new* file.
-objfile_cache = dict()
+objfile_cache: Dict[str, Set[str]] = {}
 
 
 def connect(func, event_handler, name=""):
diff --git a/pwndbg/gdblib/regs.py b/pwndbg/gdblib/regs.py
index feccd98e..78b4df3d 100644
--- a/pwndbg/gdblib/regs.py
+++ b/pwndbg/gdblib/regs.py
@@ -6,6 +6,7 @@ import ctypes
 import re
 import sys
 from types import ModuleType
+from typing import Dict
 
 import gdb
 
@@ -41,7 +42,7 @@ ARCH_GET_GS = 0x1004
 
 
 class module(ModuleType):
-    last = {}
+    last: Dict[str, int] = {}
 
     @pwndbg.lib.memoize.reset_on_stop
     @pwndbg.lib.memoize.reset_on_prompt
diff --git a/pwndbg/gdblib/stack.py b/pwndbg/gdblib/stack.py
index 7e78f1af..bf8f6d2b 100644
--- a/pwndbg/gdblib/stack.py
+++ b/pwndbg/gdblib/stack.py
@@ -6,6 +6,8 @@ Generally not needed, except under qemu-user and for when
 binaries do things to remap the stack (e.g. pwnies' postit).
 """
 
+from typing import Dict
+
 import gdb
 
 import pwndbg.gdblib.abi
@@ -17,7 +19,7 @@ import pwndbg.lib.memoize
 # Dictionary of stack ranges.
 # Key is the gdb thread ptid
 # Value is a pwndbg.lib.memory.Page object
-stacks = {}
+stacks: Dict[int, pwndbg.lib.memory.Page] = {}
 
 # Whether the stack is protected by NX.
 # This is updated automatically by is_executable.
diff --git a/pwndbg/gdblib/symbol.py b/pwndbg/gdblib/symbol.py
index 352ef152..aea0999e 100644
--- a/pwndbg/gdblib/symbol.py
+++ b/pwndbg/gdblib/symbol.py
@@ -224,6 +224,8 @@ def address(symbol: str) -> int:
     except Exception:
         pass
 
+    return None
+
 
 @pwndbg.lib.memoize.reset_on_objfile
 def static_linkage_symbol_address(symbol):
diff --git a/pwndbg/gdblib/tls.py b/pwndbg/gdblib/tls.py
index aa37828b..327c78ab 100644
--- a/pwndbg/gdblib/tls.py
+++ b/pwndbg/gdblib/tls.py
@@ -21,7 +21,9 @@ class module(ModuleType):
 
     def get_tls_base_via_errno_location(self) -> int:
         """Heuristically determine the base address of the TLS."""
-        if pwndbg.symbol.address("__errno_location") is None or pwndbg.gdblib.arch.current not in (
+        if pwndbg.gdblib.symbol.address(
+            "__errno_location"
+        ) is None or pwndbg.gdblib.arch.current not in (
             "x86-64",
             "i386",
             "arm",
diff --git a/pwndbg/lib/net.py b/pwndbg/lib/net.py
index 826a2d18..401e5097 100644
--- a/pwndbg/lib/net.py
+++ b/pwndbg/lib/net.py
@@ -189,6 +189,7 @@ NETLINK_TYPES = {
 
 class Netlink(inode):
     eth = 0
+    pid = None
 
     def __str__(self):
         return NETLINK_TYPES.get(self.eth, "(unknown netlink)")