diff --git a/pyproject.toml b/pyproject.toml
index 6bc38d94..f6c80200 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,13 +42,13 @@ rich = "^12.2.0"
 # dayone-only deps
 tzlocal = ">=4.0"   # https://github.com/regebro/tzlocal/blob/master/CHANGES.txt
 
-[tool.poetry.dev-dependencies]
+[tool.poetry.group.dev.dependencies]
 black = { version = ">=21.5b2", allow-prereleases = true }
+flakeheaven = ">=3.0"
 ipdb = "*"
 isort = ">=5.10"
 mkdocs = ">=1.0,<1.3"
 poethepoet = "*"
-pyproject-flake8 = "*"
 pytest = ">=6.2"
 pytest-bdd = ">=4.0.1,<6.0"
 pytest-clarity = "*"
@@ -150,9 +150,26 @@ filterwarnings = [
     "ignore:[WinError 5].*"
 ]
 
-[tool.flake8]
-# ignore formatting warnings and errors because we use Black to autoformat
-extend-ignore = "E101,E111,E114,E115,E116,E117,E12,E13,E2,E3,E401,E5,E70,W1,W2,W3,W5"
+[tool.flakeheaven]
+max_line_length = 88
+
+[tool.flakeheaven.plugins]
+pyflakes = ["+*"]
+pycodestyle = [
+  "+*",
+  "-E101",
+  "-E111", "-E114", "-E115", "-E116", "-E117",
+  "-E12*",
+  "-E13*",
+  "-E2*",
+  "-E3*",
+  "-E401",
+  "-E5*",
+  "-E70",
+  "-W1*", "-W2*", "-W3*", "-W5*",
+]
+"flake8-*" = ["+*"]
+
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]