diff --git a/.github/workflows/haskell-ci.yml b/.github/workflows/haskell-ci.yml
index db8e4dd..9af7978 100644
--- a/.github/workflows/haskell-ci.yml
+++ b/.github/workflows/haskell-ci.yml
@@ -1,6 +1,6 @@
 # This GitHub workflow config has been generated by a script via
 #
-#   haskell-ci 'github' 'tar.cabal'
+#   haskell-ci 'github' 'cabal.project'
 #
 # To regenerate the script (for example after adjusting tested-with) run
 #
@@ -10,7 +10,7 @@
 #
 # version: 0.17.20231110
 #
-# REGENDATA ("0.17.20231110",["github","tar.cabal"])
+# REGENDATA ("0.17.20231110",["github","cabal.project"])
 #
 name: Haskell-CI
 on:
@@ -133,7 +133,7 @@ jobs:
 
           HCNUMVER=$(${HC} --numeric-version|perl -ne '/^(\d+)\.(\d+)\.(\d+)(\.(\d+))?$/; print(10000 * $1 + 100 * $2 + ($3 == 0 ? $5 != 1 : $3))')
           echo "HCNUMVER=$HCNUMVER" >> "$GITHUB_ENV"
-          if [ $((HCNUMVER < 90000)) -ne 0 ] ; then echo "ARG_TESTS=--enable-tests" >> "$GITHUB_ENV" ; else echo "ARG_TESTS=--disable-tests" >> "$GITHUB_ENV" ; fi
+          echo "ARG_TESTS=--enable-tests" >> "$GITHUB_ENV"
           echo "ARG_BENCH=--enable-benchmarks" >> "$GITHUB_ENV"
           echo "HEADHACKAGE=false" >> "$GITHUB_ENV"
           echo "ARG_COMPILER=--$HCKIND --with-compiler=$HC" >> "$GITHUB_ENV"
@@ -194,6 +194,7 @@ jobs:
         run: |
           touch cabal.project
           echo "packages: $GITHUB_WORKSPACE/source/." >> cabal.project
+          echo "packages: $GITHUB_WORKSPACE/source/htar" >> cabal.project
           cat cabal.project
       - name: sdist
         run: |
@@ -207,15 +208,20 @@ jobs:
         run: |
           PKGDIR_tar="$(find "$GITHUB_WORKSPACE/unpacked" -maxdepth 1 -type d -regex '.*/tar-[0-9.]*')"
           echo "PKGDIR_tar=${PKGDIR_tar}" >> "$GITHUB_ENV"
+          PKGDIR_htar="$(find "$GITHUB_WORKSPACE/unpacked" -maxdepth 1 -type d -regex '.*/htar-[0-9.]*')"
+          echo "PKGDIR_htar=${PKGDIR_htar}" >> "$GITHUB_ENV"
           rm -f cabal.project cabal.project.local
           touch cabal.project
           touch cabal.project.local
           echo "packages: ${PKGDIR_tar}" >> cabal.project
+          echo "packages: ${PKGDIR_htar}" >> cabal.project
           if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "package tar" >> cabal.project ; fi
           if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "    ghc-options: -Werror=missing-methods" >> cabal.project ; fi
+          if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "package htar" >> cabal.project ; fi
+          if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "    ghc-options: -Werror=missing-methods" >> cabal.project ; fi
           cat >> cabal.project <<EOF
           EOF
-          $HCPKG list --simple-output --names-only | perl -ne 'for (split /\s+/) { print "constraints: $_ installed\n" unless /^(directory|tar)$/; }' >> cabal.project.local
+          $HCPKG list --simple-output --names-only | perl -ne 'for (split /\s+/) { print "constraints: $_ installed\n" unless /^(directory|htar|tar)$/; }' >> cabal.project.local
           cat cabal.project
           cat cabal.project.local
       - name: dump install plan
@@ -240,11 +246,13 @@ jobs:
           $CABAL v2-build $ARG_COMPILER $ARG_TESTS $ARG_BENCH all --write-ghc-environment-files=always
       - name: tests
         run: |
-          if [ $((HCNUMVER < 90000)) -ne 0 ] ; then $CABAL v2-test $ARG_COMPILER $ARG_TESTS $ARG_BENCH all --test-show-details=direct ; fi
+          $CABAL v2-test $ARG_COMPILER $ARG_TESTS $ARG_BENCH all --test-show-details=direct
       - name: cabal check
         run: |
           cd ${PKGDIR_tar} || false
           ${CABAL} -vnormal check
+          cd ${PKGDIR_htar} || false
+          ${CABAL} -vnormal check
       - name: haddock
         run: |
           $CABAL v2-haddock --disable-documentation --haddock-all $ARG_COMPILER --with-haddock $HADDOCK $ARG_TESTS $ARG_BENCH all