diff --git a/clearml_agent/commands/worker.py b/clearml_agent/commands/worker.py
index df68e59..b1c9efc 100644
--- a/clearml_agent/commands/worker.py
+++ b/clearml_agent/commands/worker.py
@@ -2446,7 +2446,9 @@ class Worker(ServiceCommandSection):
             package_api.requirements_manager.update_installed_packages_state(package_api.freeze())
             # make sure we run the handlers
             cached_requirements = \
-                {k: package_api.requirements_manager.replace(requirements[k] or '')
+                {k: package_api.requirements_manager.replace(
+                    requirements=requirements[k] or '',
+                    existing_packages=package_api.requirements_manager.get_installed_packages_state())
                  for k in requirements}
             package_api.load_requirements(cached_requirements)
             # make sure we call the correct freeze
@@ -2861,11 +2863,13 @@ class Worker(ServiceCommandSection):
                         requirement_substitutions=[CachedPackageRequirement, OnlyExternalRequirements]
                     )
                     # manually update the current state,
-                    # for the external git reference chance (in the replace callback)
+                    # for the external git reference chance (in the replaced callback)
                     package_api.requirements_manager.update_installed_packages_state(package_api.freeze())
                     # make sure we run the handlers
                     cached_requirements = \
-                        {k: package_api.requirements_manager.replace(requirements[k] or '')
+                        {k: package_api.requirements_manager.replace(
+                            requirements=requirements[k] or '',
+                            existing_packages=package_api.requirements_manager.get_installed_packages_state())
                          for k in requirements}
                     if str(cached_requirements.get('pip', '')).strip() \
                             or str(cached_requirements.get('conda', '')).strip():
diff --git a/clearml_agent/helper/base.py b/clearml_agent/helper/base.py
index 093c33d..fab4b97 100644
--- a/clearml_agent/helper/base.py
+++ b/clearml_agent/helper/base.py
@@ -22,7 +22,7 @@ from .._vendor import furl
 from .._vendor import six
 from .._vendor.attr import fields_dict
 from .._vendor.pathlib2 import Path
-from .._vendor.six.moves import reduce  # noqa
+from .._vendor.six.moves import reduce
 from .._vendor import pyyaml as yaml
 
 from clearml_agent.errors import CommandFailedError
@@ -372,15 +372,15 @@ def construct_mapping(loader, node):
     return OrderedDict(loader.construct_pairs(node))
 
 
-yaml.SafeDumper.add_representer(OrderedDict, represent_ordered_dict)
-yaml.SafeLoader.add_constructor(yaml.resolver.BaseResolver.DEFAULT_MAPPING_TAG, construct_mapping)
+# yaml.SafeDumper.add_representer(OrderedDict, represent_ordered_dict)
+# yaml.SafeLoader.add_constructor(yaml.resolver.BaseResolver.DEFAULT_MAPPING_TAG, construct_mapping)
 
 
 class AllDumper(yaml.SafeDumper):
     pass
 
 
-AllDumper.add_multi_representer(object, lambda dumper, data: dumper.represent_str(str(data)))
+# AllDumper.add_multi_representer(object, lambda dumper, data: dumper.represent_str(str(data)))
 
 
 def error(message):
diff --git a/clearml_agent/helper/package/requirements.py b/clearml_agent/helper/package/requirements.py
index 4486dd0..11d62a3 100644
--- a/clearml_agent/helper/package/requirements.py
+++ b/clearml_agent/helper/package/requirements.py
@@ -787,6 +787,13 @@ class RequirementsManager(object):
         for h in self.handlers:
             h.set_is_already_installed_cb(self._callback_is_already_installed)
 
+    def get_installed_packages_state(self):
+        """
+        Return the internal Installed Packages objects, the one used internally so that later we can detect
+        :return requirements: is the list of requirements objects updated via self.update_installed_packages_state
+        """
+        return self._installed_parsed_packages
+
     def _callback_is_already_installed(self, req):
         for p in (self._installed_parsed_packages or []):
             if p.name != req.name: