diff --git a/.github/workflows/resolver.yaml b/.github/workflows/resolver.yaml
new file mode 100644
index 0000000..72c3ea5
--- /dev/null
+++ b/.github/workflows/resolver.yaml
@@ -0,0 +1,31 @@
+name: Resolver
+on:
+  push:
+    branches:
+      - '*'
+  pull_request:
+  schedule:
+    - cron: '0 0 * * 0'
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    strategy:
+      fail-fast: false
+      matrix:
+        resolver:
+          - nightly
+          - lts-22
+          - lts-21
+          - lts-20
+          - lts-19
+          - lts-18
+          - lts-17
+          - lts-16
+          - lts-15
+          - lts-14
+          - lts-13
+    steps:
+      - uses: actions/checkout@v4
+      - run: stack build --resolver ${{ matrix.resolver }}
+      - run: stack exec sv2v --resolver ${{ matrix.resolver }} -- --help
+      - run: stack exec sv2v --resolver ${{ matrix.resolver }} -- test/basic/*.sv
diff --git a/src/Job.hs b/src/Job.hs
index e764115..8731548 100644
--- a/src/Job.hs
+++ b/src/Job.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE TemplateHaskell #-}
 {- sv2v
@@ -12,7 +13,9 @@ import Control.Monad (when)
 import Data.Char (toLower)
 import Data.List (isPrefixOf, isSuffixOf)
 import Data.Version (showVersion)
+#if MIN_VERSION_githash(0,1,5)
 import GitHash (giTag, tGitInfoCwdTry)
+#endif
 import qualified Paths_sv2v (version)
 import System.IO (stderr, hPutStr)
 import System.Console.CmdArgs
@@ -53,7 +56,11 @@ data Job = Job
     } deriving (Typeable, Data)
 
 version :: String
+#if MIN_VERSION_githash(0,1,5)
 version = either (const backup) giTag $$tGitInfoCwdTry
+#else
+version = backup
+#endif
     where backup = showVersion Paths_sv2v.version
 
 defaultJob :: Job
diff --git a/sv2v.cabal b/sv2v.cabal
index 2c33d66..e1f420b 100644
--- a/sv2v.cabal
+++ b/sv2v.cabal
@@ -24,8 +24,8 @@ executable sv2v
   main-is: sv2v.hs
   hs-source-dirs: src
   build-tool-depends:
-    , alex:alex   >= 3.2.5 && < 4
-    , happy:happy >= 1.20  && < 2
+    , alex:alex >= 3.2 && < 4
+    , happy:happy >= 1.19 && < 2
   build-depends:
     , array
     , base