diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 547a520cc..ddedabf7a 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -46,7 +46,7 @@ jobs:
     - uses: actions/setup-python@v4
       with:
         python-version: '3.x'
-    - run: python -m pip install mypy types-PyYAML
+    - run: python -m pip install mypy coverage types-PyYAML types-tqdm types-chevron
     - run: python run_mypy.py --allver
       env:
         PYTHONUNBUFFERED: 1
diff --git a/.mypy.ini b/.mypy.ini
index 70fdcd9f3..d00944bb2 100644
--- a/.mypy.ini
+++ b/.mypy.ini
@@ -2,7 +2,7 @@
 strict_optional               = False
 show_error_context            = False
 show_column_numbers           = True
-ignore_missing_imports        = True
+ignore_missing_imports        = False
 implicit_reexport             = False
 
 follow_imports                = silent
diff --git a/docs/refman/loaderyaml.py b/docs/refman/loaderyaml.py
index fc06b0d67..e7ec57a7e 100644
--- a/docs/refman/loaderyaml.py
+++ b/docs/refman/loaderyaml.py
@@ -41,7 +41,7 @@ class Template:
 
 class StrictTemplate(Template):
     def __init__(self) -> None:
-        from strictyaml import Map, MapPattern, Optional, Str, Seq, Int, Bool, EmptyList, OrValidator
+        from strictyaml import Map, MapPattern, Optional, Str, Seq, Int, Bool, EmptyList, OrValidator # type: ignore[import-untyped]
 
         d_named_object = {
             'name': Str(),
diff --git a/mesonbuild/compilers/mixins/compcert.py b/mesonbuild/compilers/mixins/compcert.py
index ac4d5aaa0..a40f635fa 100644
--- a/mesonbuild/compilers/mixins/compcert.py
+++ b/mesonbuild/compilers/mixins/compcert.py
@@ -20,7 +20,7 @@ import re
 import typing as T
 
 if T.TYPE_CHECKING:
-    from envconfig import MachineInfo
+    from ...envconfig import MachineInfo
     from ...environment import Environment
     from ...compilers.compilers import Compiler
 else:
diff --git a/mesonbuild/interpreter/compiler.py b/mesonbuild/interpreter/compiler.py
index 5528abe7a..ad6eb4b89 100644
--- a/mesonbuild/interpreter/compiler.py
+++ b/mesonbuild/interpreter/compiler.py
@@ -30,7 +30,7 @@ if T.TYPE_CHECKING:
     from ..compilers import Compiler, RunResult
     from ..interpreterbase import TYPE_var, TYPE_kwargs
     from .kwargs import ExtractRequired, ExtractSearchDirs
-    from .interpreter.interpreter import SourceOutputs
+    from .interpreter import SourceOutputs
     from ..mlog import TV_LoggableList
 
     from typing_extensions import TypedDict, Literal
@@ -856,7 +856,8 @@ class CompilerHolder(ObjectHolder['Compiler']):
     )
     def preprocess_method(self, args: T.Tuple[T.List['mesonlib.FileOrString']], kwargs: 'PreprocessKW') -> T.List[build.CustomTargetIndex]:
         compiler = self.compiler.get_preprocessor()
-        sources: 'SourceOutputs' = self.interpreter.source_strings_to_files(args[0])
+        _sources: T.List[mesonlib.File] = self.interpreter.source_strings_to_files(args[0])
+        sources = T.cast('T.List[SourceOutputs]', _sources)
         if any(isinstance(s, (build.CustomTarget, build.CustomTargetIndex, build.GeneratedList)) for s in sources):
             FeatureNew.single_use('compiler.preprocess with generated sources', '1.1.0', self.subproject,
                                   location=self.current_node)
diff --git a/mesonbuild/mdevenv.py b/mesonbuild/mdevenv.py
index 9f3d1b973..c8d0144c5 100644
--- a/mesonbuild/mdevenv.py
+++ b/mesonbuild/mdevenv.py
@@ -5,6 +5,7 @@ import argparse
 import tempfile
 import shutil
 import itertools
+import typing as T
 
 from pathlib import Path
 from . import build, minstall
@@ -12,9 +13,9 @@ from .mesonlib import (EnvironmentVariables, MesonException, is_windows, setup_v
                        get_wine_shortpath, MachineChoice)
 from . import mlog
 
-import typing as T
+
 if T.TYPE_CHECKING:
-    from .backends import InstallData
+    from .backend.backends import InstallData
 
 POWERSHELL_EXES = {'pwsh.exe', 'powershell.exe'}