diff --git a/.github/workflows/chm.yml b/.github/workflows/chm.yml
index 38f914dd7..373c64a53 100644
--- a/.github/workflows/chm.yml
+++ b/.github/workflows/chm.yml
@@ -190,6 +190,9 @@ jobs:
         name: chm
         path: ${{github.workspace}}/HTMLversion
 
+    - name: install dos2unix
+      run: sudo apt-get -y install dos2unix
+
     - name: versioning
       run: ./jenkins-phreeqc-dist.sh -v ${{ needs.init.outputs.VER }} -r ${{ needs.init.outputs.REL }} -d ${{ needs.init.outputs.DATE }}