diff --git a/src/Strategy/Python/Poetry/Common.hs b/src/Strategy/Python/Poetry/Common.hs
index 4ca54a66b6..cf842a9ef2 100644
--- a/src/Strategy/Python/Poetry/Common.hs
+++ b/src/Strategy/Python/Poetry/Common.hs
@@ -35,6 +35,7 @@ import Strategy.Python.Poetry.PyProject (
   PyProjectPoetryGitDependency (..),
   PyProjectPoetryPathDependency (..),
   PyProjectPoetryUrlDependency (..),
+  allPoetryDevDeps,
   toDependencyVersion,
  )
 
@@ -63,7 +64,7 @@ logIgnoredDeps pyproject poetryLock = for_ notSupportedDepsMsgs (logDebug . pret
     notSupportedPyProjectDevDeps =
       Map.keys $
         Map.filter (not . supportedPyProjectDep) $
-          maybe Map.empty devDependencies (pyprojectPoetry pyproject)
+          maybe Map.empty allPoetryDevDeps (pyprojectPoetry pyproject)
 
     notSupportedPyProjectDeps :: [Text]
     notSupportedPyProjectDeps =
@@ -83,7 +84,9 @@ pyProjectDeps project = filter notNamedPython $ map snd allDeps
     notNamedPython = (/= "python") . dependencyName
 
     supportedDevDeps :: Map Text PoetryDependency
-    supportedDevDeps = Map.filter supportedPyProjectDep $ maybe Map.empty devDependencies (pyprojectPoetry project)
+    supportedDevDeps =
+      Map.filter supportedPyProjectDep $
+        maybe Map.empty allPoetryDevDeps (pyprojectPoetry project)
 
     supportedProdDeps :: Map Text PoetryDependency
     supportedProdDeps = Map.filter supportedPyProjectDep $ maybe Map.empty dependencies (pyprojectPoetry project)
diff --git a/src/Strategy/Python/Poetry/PyProject.hs b/src/Strategy/Python/Poetry/PyProject.hs
index 46e4167a16..ed1f0a655e 100644
--- a/src/Strategy/Python/Poetry/PyProject.hs
+++ b/src/Strategy/Python/Poetry/PyProject.hs
@@ -13,6 +13,7 @@ module Strategy.Python.Poetry.PyProject (
   -- * for testing only
   parseConstraintExpr,
   toDependencyVersion,
+  allPoetryDevDeps,
 ) where
 
 import Control.Monad.Combinators.Expr (Operator (..), makeExprParser)
@@ -114,9 +115,13 @@ data PyProjectPoetry = PyProjectPoetry
   , description :: Maybe Text
   , dependencies :: Map Text PoetryDependency
   , devDependencies :: Map Text PoetryDependency
+  , groupDevDependencies :: Map Text PoetryDependency
   }
   deriving (Show, Eq, Ord)
 
+allPoetryDevDeps :: PyProjectPoetry -> Map Text PoetryDependency
+allPoetryDevDeps PyProjectPoetry{devDependencies, groupDevDependencies} = devDependencies <> groupDevDependencies
+
 data PoetryDependency
   = PoetryTextVersion Text
   | PyProjectPoetryDetailedVersionDependencySpec PyProjectPoetryDetailedVersionDependency
@@ -133,6 +138,7 @@ pyProjectPoetryCodec =
     <*> Toml.dioptional (Toml.text "description") .= description
     <*> Toml.tableMap Toml._KeyText pyProjectPoetryDependencyCodec "dependencies" .= dependencies
     <*> Toml.tableMap Toml._KeyText pyProjectPoetryDependencyCodec "dev-dependencies" .= devDependencies
+    <*> Toml.tableMap Toml._KeyText pyProjectPoetryDependencyCodec "group.dev.dependencies" .= groupDevDependencies
 
 pyProjectPoetryDependencyCodec :: Toml.Key -> TomlCodec PoetryDependency
 pyProjectPoetryDependencyCodec key =
diff --git a/test/Python/Poetry/CommonSpec.hs b/test/Python/Poetry/CommonSpec.hs
index 9769e581a7..fb586c3f02 100644
--- a/test/Python/Poetry/CommonSpec.hs
+++ b/test/Python/Poetry/CommonSpec.hs
@@ -100,6 +100,7 @@ expectedPyProject =
             , devDependencies =
                 Map.fromList
                   [("pytest", PoetryTextVersion "*")]
+            , groupDevDependencies = Map.empty -- TODO: Fill in for real.
             }
     }
 
diff --git a/test/Python/Poetry/PyProjectSpec.hs b/test/Python/Poetry/PyProjectSpec.hs
index 244aa64923..4cd69dd277 100644
--- a/test/Python/Poetry/PyProjectSpec.hs
+++ b/test/Python/Poetry/PyProjectSpec.hs
@@ -77,6 +77,7 @@ expectedPyProject =
             , devDependencies =
                 Map.fromList
                   [("pytest", PoetryTextVersion "*")]
+            , groupDevDependencies = Map.empty -- TODO: Fill this in for realsies.
             }
     }
 
diff --git a/test/Python/PoetrySpec.hs b/test/Python/PoetrySpec.hs
index 66f15de435..bf91376e02 100644
--- a/test/Python/PoetrySpec.hs
+++ b/test/Python/PoetrySpec.hs
@@ -26,7 +26,7 @@ candidatePyProject :: PyProject
 candidatePyProject =
   PyProject
     (Just $ PyProjectBuildSystem "poetry.core.masonry.api")
-    (Just $ PyProjectPoetry Nothing Nothing Nothing (Map.fromList ([("flow_pipes", PoetryTextVersion "^1.21")])) Map.empty)
+    (Just $ PyProjectPoetry Nothing Nothing Nothing (Map.fromList ([("flow_pipes", PoetryTextVersion "^1.21")])) Map.empty Map.empty)
     Nothing
     Nothing