diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 7a1089241..39459f2a9 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -29,9 +29,20 @@ jobs:
           export DIFF=$( git diff --name-only ${{ github.event.before }} $GITHUB_SHA )
           echo "  diff between ${{ github.event.before }} and $GITHUB_SHA"
         fi
-        echo "$DIFF"
+        echo "***"; echo "$DIFF"; echo "***"
         # Escape newlines (replace \n with %0A)
-        echo "::set-output name=diff::$( echo "$DIFF" | sed ':a;N;$!ba;s/\n/%0A/g' )"
+        # deprecated:
+        #echo "::set-output name=diff::$( echo "$DIFF" | sed ':a;N;$!ba;s/\n/%0A/g' )"
+        # new:
+        # replace new line with %0A - will result finding only one file with a very long name...
+        #echo "diff=$( echo "$DIFF" | sed ':a;N;$!ba;s/\n/%0A/g' )" >> $GITHUB_OUTPUT
+        # doesn't work...
+        #echo "diff=\"$DIFF\"" >> "$GITHUB_OUTPUT"
+        # new multi-line format:
+        # (https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#multiline-strings)
+        echo "diff<<EOF" >> $GITHUB_OUTPUT
+        echo "$DIFF" >> $GITHUB_OUTPUT
+        echo "EOF" >> $GITHUB_OUTPUT
 
     - name: Output changes
       run: echo "${{ steps.diff.outputs.diff }}"
@@ -151,7 +162,7 @@ jobs:
 
     - name: Cache Intel oneapi packages
       id: cache-intel-oneapi
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: /opt/intel/oneapi
         key: install-${{ runner.os }}-all