diff --git a/.github/workflows/ecosystem-batch-repo-check.yml b/.github/workflows/ecosystem-batch-repo-check.yml
index dc5fa08559..e9f262af08 100644
--- a/.github/workflows/ecosystem-batch-repo-check.yml
+++ b/.github/workflows/ecosystem-batch-repo-check.yml
@@ -12,8 +12,8 @@ jobs:
     - name: Setup variables
       id: vars
       run: |
-        echo "::set-output name=datetime::$(date +'%Y_%m_%d_%H_%M')"
-        echo "::set-output name=pr_branch_name::batch_checks_$(date +'%Y_%m_%d_%H_%M')"
+        echo "datetime=$(date +'%Y_%m_%d_%H_%M')" >> "$GITHUB_OUTPUT"
+        echo "pr_branch_name=batch_checks_$(date +'%Y_%m_%d_%H_%M')" >> "$GITHUB_OUTPUT"
     - uses: actions/checkout@v3
     - name: Set up Python 3.9
       uses: actions/setup-python@v4
diff --git a/.github/workflows/ecosystem-main_repos_fetch.yml b/.github/workflows/ecosystem-main_repos_fetch.yml
index 4403f4185b..e8b919bab7 100644
--- a/.github/workflows/ecosystem-main_repos_fetch.yml
+++ b/.github/workflows/ecosystem-main_repos_fetch.yml
@@ -15,8 +15,8 @@ jobs:
     - name: Setup variables
       id: vars
       run: |
-        echo "::set-output name=datetime::$(date +'%Y_%m_%d_%H_%M')"
-        echo "::set-output name=pr_branch_name::fetch_tests_for_main_$(date +'%Y_%m_%d_%H_%M')"
+        echo "datetime=$(date +'%Y_%m_%d_%H_%M')" >> "$GITHUB_OUTPUT"
+        echo "pr_branch_name=fetch_tests_for_main_$(date +'%Y_%m_%d_%H_%M')" >> "$GITHUB_OUTPUT"
     - uses: actions/checkout@v3
     - name: Set up Python ${{ env.python-version }}
       uses: actions/setup-python@v4
diff --git a/ecosystem/runners/runner.py b/ecosystem/runners/runner.py
index 9444ca5b7e..59acd2d691 100644
--- a/ecosystem/runners/runner.py
+++ b/ecosystem/runners/runner.py
@@ -163,9 +163,9 @@ def run(self) -> Tuple[str, List[CommandExecutionSummary]]:
                 logs_fail += element.get_fail_logs()
             set_actions_output(
                 [
-                    ("DEPRECIATION", "\n".join(logs_depreciation)),
-                    ("ERROR", "\n".join(logs_error)),
-                    ("FAIL", "\n".join(logs_fail)),
+                    ("DEPRECIATION", " ".join(logs_depreciation)),
+                    ("ERROR", " ".join(logs_error)),
+                    ("FAIL", " ".join(logs_fail)),
                 ]
             )
 
diff --git a/ecosystem/utils/__init__.py b/ecosystem/utils/__init__.py
index 542b29fb9d..c416c61357 100644
--- a/ecosystem/utils/__init__.py
+++ b/ecosystem/utils/__init__.py
@@ -1,5 +1,6 @@
 """Utility functions and classes."""
 
 from .utils import logger
+from .utils import set_actions_output
 from .utils import OneLineExceptionFormatter
 from .submission_parser import parse_submission_issue
diff --git a/ecosystem/utils/utils.py b/ecosystem/utils/utils.py
index 189415700d..0e3cfa9364 100644
--- a/ecosystem/utils/utils.py
+++ b/ecosystem/utils/utils.py
@@ -38,6 +38,8 @@ def set_actions_output(outputs: List[Tuple[str, Union[str, bool, float, int]]])
     """
     for name, value in outputs:
         logger.info("Setting output variable %s: %s", name, value)
+        if value is not None:
+            assert "\n" not in value, f"Error: Newlines in github output ({value})"
         if "CI" in os.environ:
             with open(os.environ["GITHUB_OUTPUT"], "a") as github_env:
                 github_env.write(f"{name}={value}\n")
diff --git a/tests/utils/test_utils.py b/tests/utils/test_utils.py
index 723e8bd7de..58ae2890ba 100644
--- a/tests/utils/test_utils.py
+++ b/tests/utils/test_utils.py
@@ -1,9 +1,11 @@
 """Tests for manager."""
 import os
+import io
 from unittest import TestCase
+from contextlib import redirect_stdout
 
 from ecosystem.models.repository import Repository
-from ecosystem.utils import parse_submission_issue
+from ecosystem.utils import parse_submission_issue, set_actions_output
 
 
 class TestUtils(TestCase):
@@ -17,7 +19,7 @@ def setUp(self) -> None:
             self.issue_body = issue_body_file.read()
 
     def test_issue_parsing(self):
-        """ "Tests issue parsing function:
+        """Tests issue parsing function:
         Function:
                 -> parse_submission_issue
         Args:
@@ -40,3 +42,28 @@ def test_issue_parsing(self):
         self.assertEqual(
             parsed_result.labels, ["tool", "tutorial", "paper implementation"]
         )
+
+    def test_set_actions_output(self):
+        """Test set actions output."""
+        # Test ok -> ok
+        captured_output = io.StringIO()
+        with redirect_stdout(captured_output):
+            set_actions_output([("success", "this test is a success case!")])
+        output_value = captured_output.getvalue()
+        self.assertEqual(output_value, "success=this test is a success case!\n")
+
+        # Test ok -> ko
+        with self.assertRaises(AssertionError):
+            set_actions_output(
+                [
+                    (
+                        "fail",
+                        """
+                this test is a failed case,
+                why ?
+                because it's a multi-lines output
+                and GITHUB_OUTPUT doesn't like that!
+                """,
+                    )
+                ]
+            )