diff --git a/CveXplore/.schema_version b/CveXplore/.schema_version
index d38695d7..0f1efb3a 100644
--- a/CveXplore/.schema_version
+++ b/CveXplore/.schema_version
@@ -1,4 +1,4 @@
 {
-    "version": "1.8",
+    "version": "1.9",
     "rebuild_needed": true
 }
diff --git a/CveXplore/core/database_actions/db_action.py b/CveXplore/core/database_actions/db_action.py
index 19101da8..e8984cdc 100644
--- a/CveXplore/core/database_actions/db_action.py
+++ b/CveXplore/core/database_actions/db_action.py
@@ -13,7 +13,7 @@ class DatabaseAction(object):
 
     actions = collections.namedtuple("Actions", "InsertOne UpdateOne")(0, 1)
 
-    def __init__(self, action: actions, doc: dict):
+    def __init__(self, action: actions, doc: dict, upsert: bool = True):
         """
         Create a DatabaseAction object.
 
@@ -23,6 +23,7 @@ def __init__(self, action: actions, doc: dict):
         """
         self.action = action
         self.doc = doc
+        self.upsert = upsert
 
     @property
     def entry(self):
@@ -37,4 +38,6 @@ def entry(self):
         if self.action == self.actions.InsertOne:
             return InsertOne(self.doc)
         elif self.action == self.actions.UpdateOne:
-            return UpdateOne({"id": self.doc["id"]}, {"$set": self.doc}, upsert=True)
+            return UpdateOne(
+                {"id": self.doc["id"]}, {"$set": self.doc}, upsert=self.upsert
+            )
diff --git a/CveXplore/core/database_maintenance/sources_process.py b/CveXplore/core/database_maintenance/sources_process.py
index ed5468fb..f1d0eca5 100644
--- a/CveXplore/core/database_maintenance/sources_process.py
+++ b/CveXplore/core/database_maintenance/sources_process.py
@@ -1048,8 +1048,7 @@ def process_item(self, item):
         if epss is not None:
             self.queue.put(
                 DatabaseAction(
-                    action=DatabaseAction.actions.UpdateOne,
-                    doc=epss,
+                    action=DatabaseAction.actions.UpdateOne, doc=epss, upsert=False
                 )
             )
 
diff --git a/requirements/modules/mongodb.txt b/requirements/modules/mongodb.txt
index 4e9d13d2..7930f795 100644
--- a/requirements/modules/mongodb.txt
+++ b/requirements/modules/mongodb.txt
@@ -1 +1 @@
-pymongo>=4.5.0
\ No newline at end of file
+pymongo>=4.8.0
\ No newline at end of file