diff --git a/pyproject.toml b/pyproject.toml
index 813e14b..d1131fc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,6 +31,8 @@ dev-dependencies = [
     "pytest>=8.3.3",
     "pytest-mock>=3.14.0",
     "ruff>=0.6.5",
+    "flake8>=7.1.1",
+    "coverage>=7.6.1",
 ]
 
 [tool.hatch.metadata]
diff --git a/requirements-dev.lock b/requirements-dev.lock
index cc38c21..e7d0a0d 100644
--- a/requirements-dev.lock
+++ b/requirements-dev.lock
@@ -3,19 +3,27 @@
 #
 # last locked with the following flags:
 #   pre: false
-#   features: []
+#   features: ["dev"]
 #   all-features: false
 #   with-sources: false
 #   generate-hashes: false
 #   universal: false
 
 -e file:.
+coverage==7.6.1
+flake8==7.1.1
 iniconfig==2.0.0
     # via pytest
+mccabe==0.7.0
+    # via flake8
 packaging==24.1
     # via pytest
 pluggy==1.5.0
     # via pytest
+pycodestyle==2.12.1
+    # via flake8
+pyflakes==3.2.0
+    # via flake8
 pytest==8.3.3
     # via pytest-mock
 pytest-mock==3.14.0
diff --git a/requirements.lock b/requirements.lock
index 505fd45..3b28b6a 100644
--- a/requirements.lock
+++ b/requirements.lock
@@ -3,7 +3,7 @@
 #
 # last locked with the following flags:
 #   pre: false
-#   features: []
+#   features: ["dev"]
 #   all-features: false
 #   with-sources: false
 #   generate-hashes: false