diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 # CHANGELOG
 
+## Version 0.2.0 (2025-07-21)
+
+- Changed `cancelInProgress` from `Maybe Bool` to `Maybe Text` to support GitHub Actions expressions
+
 ## Version 0.1.0 (2025-07-01)
 
 Released upon an unsuspecting world
+
+## Version 0.1.1 (2025-07-21)
+
+- Added missing module exports
+- Support multiple undocumented input types that work in YAML but were not supported
diff --git a/github-actions.cabal b/github-actions.cabal
--- a/github-actions.cabal
+++ b/github-actions.cabal
@@ -1,6 +1,6 @@
 cabal-version:      2.2
 name:               github-actions
-version:            0.1.1.0
+version:            0.2.0.0
 synopsis:           Github Actions
 description:
   This library provides types and instances for serializing and deserializing
@@ -24,7 +24,7 @@
   test/golden/configuration-main.hs.txt
   test/golden/configuration-main.yml
 
-tested-with:        GHC ==9.6.6 || ==9.8.2 || ==9.10.1
+tested-with:        GHC ==9.6.7 || ==9.8.4 || ==9.10.3 || ==9.12.4
 
 common opts
   default-language: Haskell2010
@@ -38,9 +38,9 @@
 common deps
   build-depends:
     , aeson               ^>=2.2.3.0
-    , base                >=4.14      && <4.22
+    , base                >=4.14      && <4.23
     , containers          ^>=0.6.7    || ^>=0.7   || ^>=0.8
-    , hedgehog            ^>=1.5
+    , hedgehog            ^>=1.5      || ^>=1.6   || ^>=1.7
     , hoist-error         ^>=0.3
     , string-interpolate  ^>=0.3.3
     , text                ^>=1.2.4.1  || ^>=2.0.2 || ^>=2.1.1
@@ -82,12 +82,12 @@
   other-modules:      Language.Github.Actions.WorkflowTest
   build-tool-depends: tasty-discover:tasty-discover ^>=4.2.2
   build-depends:
-    , bytestring          ==0.11.5.3  || ==0.12.1.0
+    , bytestring          ^>=0.11.4.0 || ^>=0.12.0.2
     , filepath            ^>=1.4      || ^>=1.5
     , github-actions
     , pretty-show         ^>=1.10
     , tasty               ^>=1.5
-    , tasty-discover      ^>=5.0.0
+    , tasty-discover      ^>=5.0.0    || ^>=5.1.0    || ^>=5.2.0
     , tasty-golden        ^>=2.3.5
     , tasty-golden-extra  ^>=0.1.0
     , tasty-hedgehog      ^>=1.4.0.0
diff --git a/src/Language/Github/Actions/Concurrency.hs b/src/Language/Github/Actions/Concurrency.hs
--- a/src/Language/Github/Actions/Concurrency.hs
+++ b/src/Language/Github/Actions/Concurrency.hs
@@ -27,6 +27,7 @@
 
 import Data.Aeson (FromJSON, ToJSON (..), (.:?), (.=))
 import qualified Data.Aeson as Aeson
+import Data.Aeson.Types (Parser)
 import Data.Text (Text)
 import GHC.Generics (Generic)
 import Hedgehog (MonadGen)
@@ -48,7 +49,7 @@
 -- deploymentConcurrency :: Concurrency
 -- deploymentConcurrency = Concurrency
 --  { group = Just "${{ github.ref }}"
---  , cancelInProgress = Just True
+--  , cancelInProgress = Just "true"
 --  }
 -- @
 --
@@ -56,26 +57,36 @@
 data Concurrency = Concurrency
   { -- | Concurrency group identifier
     group :: Maybe Text,
-    -- | Whether to cancel in-progress runs
-    cancelInProgress :: Maybe Bool
+    -- | Whether to cancel in-progress runs (can be "true", "false", or an expression)
+    cancelInProgress :: Maybe Text
   }
   deriving stock (Eq, Generic, Ord, Show)
 
 instance FromJSON Concurrency where
   parseJSON = Aeson.withObject "Concurrency" $ \o -> do
     group <- o .:? "group"
-    cancelInProgress <- o .:? "cancel-in-progress"
+    mVal <- o .:? "cancel-in-progress" :: Parser (Maybe Aeson.Value)
+    cancelInProgress <- case mVal of
+      Nothing -> pure Nothing
+      Just (Aeson.Bool True) -> pure (Just "true")
+      Just (Aeson.Bool False) -> pure (Just "false")
+      Just (Aeson.String s) -> pure (Just s)
+      Just _ -> fail "cancel-in-progress must be a boolean or string"
     pure Concurrency {..}
 
 instance ToJSON Concurrency where
   toJSON Concurrency {..} =
     Aeson.object
       [ "group" .= group,
-        "cancel-in-progress" .= cancelInProgress
+        "cancel-in-progress" .= fmap cancelInProgressToJSON cancelInProgress
       ]
+    where
+      cancelInProgressToJSON "true" = Aeson.Bool True
+      cancelInProgressToJSON "false" = Aeson.Bool False
+      cancelInProgressToJSON t = Aeson.String t
 
 gen :: (MonadGen m) => m Concurrency
 gen = do
   group <- Gen.maybe (Gen.text (Range.linear 1 5) Gen.alphaNum)
-  cancelInProgress <- Gen.maybe Gen.bool
+  cancelInProgress <- Gen.maybe (Gen.text (Range.linear 1 5) Gen.alphaNum)
   pure Concurrency {..}
diff --git a/test/Language/Github/Actions/WorkflowTest.hs b/test/Language/Github/Actions/WorkflowTest.hs
--- a/test/Language/Github/Actions/WorkflowTest.hs
+++ b/test/Language/Github/Actions/WorkflowTest.hs
@@ -1,4 +1,3 @@
-{-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE TypeApplications #-}
 {-# OPTIONS_GHC -Wno-incomplete-uni-patterns #-}
 
@@ -29,7 +28,7 @@
     testGroup
       "Yaml Roundtrip"
       [ runGoldenVsToYamlFileTest testYamlFilePath
-        | testYamlFilePath <- testYamlFiles
+      | testYamlFilePath <- testYamlFiles
       ]
   where
     runGoldenVsToYamlFileTest testYamlFilePath =
diff --git a/test/golden/configuration-main.hs.txt b/test/golden/configuration-main.hs.txt
--- a/test/golden/configuration-main.hs.txt
+++ b/test/golden/configuration-main.hs.txt
@@ -3,7 +3,7 @@
       Just
         Concurrency
           { group = Just "${{ github.ref }}"
-          , cancelInProgress = Just False
+          , cancelInProgress = Just "false"
           }
   , defaults = Nothing
   , env = fromList [ ( "SYSTEM_NAME" , "Product Configuration" ) ]