diff --git a/charts/lomas/Chart.yaml b/charts/lomas/Chart.yaml
index 4a8b677..f21ce13 100644
--- a/charts/lomas/Chart.yaml
+++ b/charts/lomas/Chart.yaml
@@ -16,15 +16,15 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 0.3.1
+version: 0.3.4
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to
 # follow Semantic Versioning. They should reflect the version the application is using.
 # It is recommended to use it with quotes.
-appVersion: "0.3.1"
+appVersion: "0.3.4"
 
 dependencies:
   - name: lomas-server
-    version: "0.3.1"
+    version: "0.3.4"
     repository: https://dscc-admin-ch.github.io/helm-charts
diff --git a/charts/lomas/values.schema.json b/charts/lomas/values.schema.json
index 9a8a65c..2d5a844 100644
--- a/charts/lomas/values.schema.json
+++ b/charts/lomas/values.schema.json
@@ -42,10 +42,10 @@
                                 },
                                 "tag": {
                                     "type": "string",
-                                    "default": "0.3.1",
+                                    "default": "0.3.4",
                                     "enum": [
                                         "latest",
-                                        "0.3.1"
+                                        "0.3.4"
                                     ]
                                 }
                             }
@@ -268,6 +268,18 @@
                 "mongodb": {
                     "type": "object",
                     "properties": {
+                        "max_pool_size": {
+                            "description": "Total number of open connections (active + idle) allowed in the pool.",
+                            "type": "int"
+                        },
+                        "min_pool_size": {
+                            "description": "Minimum number of idle connections that will be maintained, even when the application is idle or under low load.",
+                            "type": "int"
+                        },
+                        "max_connecting": {
+                            "description": "Controls the number of simultaneous new connection attempts being made.",
+                            "type": "int"
+                        },
                         "architecture": {
                             "type": "string",
                             "default": "standalone",
@@ -438,10 +450,10 @@
                                 },
                                 "tag": {
                                     "type": "string",
-                                    "default": "0.3.1",
+                                    "default": "0.3.4",
                                     "enum": [
                                         "latest",
-                                        "0.3.1"
+                                        "0.3.4"
                                     ]
                                 }
                             }
@@ -704,7 +716,33 @@
                                                     }
                                                 }
                                             }
-                                        }
+                                        },
+                                        "private_db_credentials": {
+                                            "description": "List of credentials to access private dataset",
+                                            "type": "array",
+                                            "items": {
+                                                "type": "object",
+                                                "properties": {
+                                                    "db_type": {
+                                                        "type": "string",
+                                                        "description": "Type of the private database",
+                                                        "enum": ["S3_DB"]
+                                                    },
+                                                    "access_key_id": {
+                                                        "type": "string",
+                                                        "description": "Access key ID for the private database"
+                                                    },
+                                                    "secret_access_key": {
+                                                        "type": "string",
+                                                        "description": "Secret access key for the private database"
+                                                    },
+                                                    "credentials_name": {
+                                                        "type": "string",
+                                                        "description": "Unique name for the database credentials"
+                                                    }
+                                                }
+                                            }
+                                        } 
                                     }
                                 }
                             }
diff --git a/charts/lomas/values.yaml b/charts/lomas/values.yaml
index 559b767..bf4c533 100644
--- a/charts/lomas/values.yaml
+++ b/charts/lomas/values.yaml
@@ -10,6 +10,9 @@ lomas-server:
   mongodb:
     resources: {}
     fullnameOverride: "lomas-mongodb"
+    max_pool_size: 100
+    min_pool_size: 2
+    max_connecting: 2
     architecture: standalone
     image:
       tag: "6.0.9-debian-11-r5"
@@ -66,8 +69,7 @@ lomas-server:
             contrib: True
             floating_point: True
             honest_but_curious: True
-
-
+        private_db_credentials: [] # list of credentials, eg. {credentials_name: "abc", db_type: "S3_DB", ...}
 
     service:
       type: ClusterIP