diff --git a/packages/go/model/model.go b/packages/go/model/model.go
index 8c77984..f8284f6 100644
--- a/packages/go/model/model.go
+++ b/packages/go/model/model.go
@@ -387,21 +387,27 @@ type LanguageTarget struct {
 
 type LanguageTargetSpec struct {
 	Icon       *IconValue             `json:"icon,omitempty"`      
-	Local      LocalDevContainer      `json:"local"`               
+	Local      LocalDevContainer      `json:"local"`               // if type is "docker" or empty - Local development container using a fixed docker image.; User code will be mounted into the container.; if type is "dockerfile" - Local development container using a Dockerfile. User code will; be built into the container.
 	Schema     map[string]interface{} `json:"schema,omitempty"`    
 	Versioning []Versioning           `json:"versioning,omitempty"`
 }
 
+// if type is "docker" or empty - Local development container using a fixed docker image.
+// User code will be mounted into the container.
+// if type is "dockerfile" - Local development container using a Dockerfile. User code will
+// be built into the container.
 type LocalDevContainer struct {
 	Env         []string                   `json:"Env,omitempty"`        
 	Handlers    *LocalDevContainerHandlers `json:"handlers,omitempty"`   
 	Healthcheck *string                    `json:"healthcheck,omitempty"`
 	HostConfig  map[string]interface{}     `json:"HostConfig,omitempty"` 
-	Image       string                     `json:"image"`                
+	Image       *string                    `json:"image,omitempty"`      
 	Labels      map[string]interface{}     `json:"Labels,omitempty"`     
 	Options     map[string]interface{}     `json:"options,omitempty"`    
+	Type        *string                    `json:"type,omitempty"`       
 	UserHome    *string                    `json:"userHome,omitempty"`   
 	WorkingDir  *string                    `json:"workingDir,omitempty"` 
+	File        *string                    `json:"file,omitempty"`       
 }
 
 type LocalDevContainerHandlers struct {
diff --git a/packages/go/schemas/concepts/core/language-target.json b/packages/go/schemas/concepts/core/language-target.json
index a6ccb8e..0914b1d 100644
--- a/packages/go/schemas/concepts/core/language-target.json
+++ b/packages/go/schemas/concepts/core/language-target.json
@@ -7,6 +7,77 @@
     "schema": {
       "$id": "/core/language-target",
       "$schema": "http://json-schema.org/draft-07/schema#",
+      "definitions": {
+        "LocalDevContainerDocker": {
+          "type": "object",
+          "additionalProperties": false,
+          "required": [
+            "image"
+          ],
+          "properties": {
+            "type": {
+              "type": "string",
+              "const": "docker"
+            },
+            "image": {
+              "type": "string"
+            },
+            "options": {
+              "type": "object",
+              "additionalProperties": true
+            },
+            "userHome": {
+              "type": "string"
+            },
+            "workingDir": {
+              "type": "string"
+            },
+            "healthcheck": {
+              "type": "string"
+            },
+            "HostConfig": {
+              "type": "object",
+              "additionalProperties": true
+            },
+            "Labels": {
+              "type": "object",
+              "additionalProperties": true
+            },
+            "Env": {
+              "type": "array",
+              "items": {
+                "type": "string"
+              }
+            },
+            "handlers": {
+              "title": "LocalDevContainerHandlers",
+              "type": "object",
+              "additionalProperties": false,
+              "properties": {
+                "onCreate": {
+                  "type": "string"
+                }
+              }
+            }
+          }
+        },
+        "LocalDevContainerDockerfile": {
+          "type": "object",
+          "additionalProperties": false,
+          "required": [
+            "type"
+          ],
+          "properties": {
+            "type": {
+              "type": "string",
+              "const": "dockerfile"
+            },
+            "file": {
+              "type": "string"
+            }
+          }
+        }
+      },
       "type": "object",
       "additionalProperties": false,
       "required": [
@@ -40,53 +111,15 @@
             },
             "local": {
               "title": "LocalDevContainer",
-              "type": "object",
-              "additionalProperties": false,
-              "required": [
-                "image"
-              ],
-              "properties": {
-                "image": {
-                  "type": "string"
-                },
-                "options": {
-                  "type": "object",
-                  "additionalProperties": true
-                },
-                "userHome": {
-                  "type": "string"
-                },
-                "workingDir": {
-                  "type": "string"
+              "description": "if type is \"docker\" or empty - Local development container using a fixed docker image. User code will be mounted into the container.\nif type is \"dockerfile\" - Local development container using a Dockerfile. User code will be built into the container.",
+              "oneOf": [
+                {
+                  "$ref": "#/definitions/LocalDevContainerDocker"
                 },
-                "healthcheck": {
-                  "type": "string"
-                },
-                "HostConfig": {
-                  "type": "object",
-                  "additionalProperties": true
-                },
-                "Labels": {
-                  "type": "object",
-                  "additionalProperties": true
-                },
-                "Env": {
-                  "type": "array",
-                  "items": {
-                    "type": "string"
-                  }
-                },
-                "handlers": {
-                  "title": "LocalDevContainerHandlers",
-                  "type": "object",
-                  "additionalProperties": false,
-                  "properties": {
-                    "onCreate": {
-                      "type": "string"
-                    }
-                  }
+                {
+                  "$ref": "#/definitions/LocalDevContainerDockerfile"
                 }
-              }
+              ]
             }
           }
         }
diff --git a/packages/maven/pom.xml b/packages/maven/pom.xml
index 9fc8144..32d9ff9 100644
--- a/packages/maven/pom.xml
+++ b/packages/maven/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>com.kapeta</groupId>
     <artifactId>schemas</artifactId>
-    <version>3.3.0</version>
+    <version>3.4.0</version>
 
     <name>${project.groupId}:${project.artifactId}</name>
     <description>Data schemas for Kapeta</description>
diff --git a/packages/maven/src/main/java/com/kapeta/schemas/entity/LocalDevContainer.java b/packages/maven/src/main/java/com/kapeta/schemas/entity/LocalDevContainer.java
index 15ee095..a0e3831 100644
--- a/packages/maven/src/main/java/com/kapeta/schemas/entity/LocalDevContainer.java
+++ b/packages/maven/src/main/java/com/kapeta/schemas/entity/LocalDevContainer.java
@@ -3,6 +3,12 @@
 import java.util.List;
 import java.util.Map;
 
+/**
+ * if type is "docker" or empty - Local development container using a fixed docker image.
+ * User code will be mounted into the container.
+ * if type is "dockerfile" - Local development container using a Dockerfile. User code will
+ * be built into the container.
+ */
 @lombok.Data
 public class LocalDevContainer {
     private List<String> env;
@@ -12,6 +18,8 @@ public class LocalDevContainer {
     private String image;
     private Map<String, Object> labels;
     private Map<String, Object> options;
+    private String type;
     private String userHome;
     private String workingDir;
+    private String file;
 }
diff --git a/packages/maven/src/main/resources/schemas/concepts/core/language-target.json b/packages/maven/src/main/resources/schemas/concepts/core/language-target.json
index a6ccb8e..0914b1d 100644
--- a/packages/maven/src/main/resources/schemas/concepts/core/language-target.json
+++ b/packages/maven/src/main/resources/schemas/concepts/core/language-target.json
@@ -7,6 +7,77 @@
     "schema": {
       "$id": "/core/language-target",
       "$schema": "http://json-schema.org/draft-07/schema#",
+      "definitions": {
+        "LocalDevContainerDocker": {
+          "type": "object",
+          "additionalProperties": false,
+          "required": [
+            "image"
+          ],
+          "properties": {
+            "type": {
+              "type": "string",
+              "const": "docker"
+            },
+            "image": {
+              "type": "string"
+            },
+            "options": {
+              "type": "object",
+              "additionalProperties": true
+            },
+            "userHome": {
+              "type": "string"
+            },
+            "workingDir": {
+              "type": "string"
+            },
+            "healthcheck": {
+              "type": "string"
+            },
+            "HostConfig": {
+              "type": "object",
+              "additionalProperties": true
+            },
+            "Labels": {
+              "type": "object",
+              "additionalProperties": true
+            },
+            "Env": {
+              "type": "array",
+              "items": {
+                "type": "string"
+              }
+            },
+            "handlers": {
+              "title": "LocalDevContainerHandlers",
+              "type": "object",
+              "additionalProperties": false,
+              "properties": {
+                "onCreate": {
+                  "type": "string"
+                }
+              }
+            }
+          }
+        },
+        "LocalDevContainerDockerfile": {
+          "type": "object",
+          "additionalProperties": false,
+          "required": [
+            "type"
+          ],
+          "properties": {
+            "type": {
+              "type": "string",
+              "const": "dockerfile"
+            },
+            "file": {
+              "type": "string"
+            }
+          }
+        }
+      },
       "type": "object",
       "additionalProperties": false,
       "required": [
@@ -40,53 +111,15 @@
             },
             "local": {
               "title": "LocalDevContainer",
-              "type": "object",
-              "additionalProperties": false,
-              "required": [
-                "image"
-              ],
-              "properties": {
-                "image": {
-                  "type": "string"
-                },
-                "options": {
-                  "type": "object",
-                  "additionalProperties": true
-                },
-                "userHome": {
-                  "type": "string"
-                },
-                "workingDir": {
-                  "type": "string"
+              "description": "if type is \"docker\" or empty - Local development container using a fixed docker image. User code will be mounted into the container.\nif type is \"dockerfile\" - Local development container using a Dockerfile. User code will be built into the container.",
+              "oneOf": [
+                {
+                  "$ref": "#/definitions/LocalDevContainerDocker"
                 },
-                "healthcheck": {
-                  "type": "string"
-                },
-                "HostConfig": {
-                  "type": "object",
-                  "additionalProperties": true
-                },
-                "Labels": {
-                  "type": "object",
-                  "additionalProperties": true
-                },
-                "Env": {
-                  "type": "array",
-                  "items": {
-                    "type": "string"
-                  }
-                },
-                "handlers": {
-                  "title": "LocalDevContainerHandlers",
-                  "type": "object",
-                  "additionalProperties": false,
-                  "properties": {
-                    "onCreate": {
-                      "type": "string"
-                    }
-                  }
+                {
+                  "$ref": "#/definitions/LocalDevContainerDockerfile"
                 }
-              }
+              ]
             }
           }
         }
diff --git a/packages/npm/package.json b/packages/npm/package.json
index 0265299..e9329a9 100644
--- a/packages/npm/package.json
+++ b/packages/npm/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@kapeta/schemas",
-    "version": "3.3.0",
+    "version": "3.4.0",
     "main": "dist/cjs/index.js",
     "module": "dist/esm/index.js",
     "types": "dist/index.d.ts",
diff --git a/packages/npm/schemas/concepts/core/language-target.json b/packages/npm/schemas/concepts/core/language-target.json
index a6ccb8e..0914b1d 100644
--- a/packages/npm/schemas/concepts/core/language-target.json
+++ b/packages/npm/schemas/concepts/core/language-target.json
@@ -7,6 +7,77 @@
     "schema": {
       "$id": "/core/language-target",
       "$schema": "http://json-schema.org/draft-07/schema#",
+      "definitions": {
+        "LocalDevContainerDocker": {
+          "type": "object",
+          "additionalProperties": false,
+          "required": [
+            "image"
+          ],
+          "properties": {
+            "type": {
+              "type": "string",
+              "const": "docker"
+            },
+            "image": {
+              "type": "string"
+            },
+            "options": {
+              "type": "object",
+              "additionalProperties": true
+            },
+            "userHome": {
+              "type": "string"
+            },
+            "workingDir": {
+              "type": "string"
+            },
+            "healthcheck": {
+              "type": "string"
+            },
+            "HostConfig": {
+              "type": "object",
+              "additionalProperties": true
+            },
+            "Labels": {
+              "type": "object",
+              "additionalProperties": true
+            },
+            "Env": {
+              "type": "array",
+              "items": {
+                "type": "string"
+              }
+            },
+            "handlers": {
+              "title": "LocalDevContainerHandlers",
+              "type": "object",
+              "additionalProperties": false,
+              "properties": {
+                "onCreate": {
+                  "type": "string"
+                }
+              }
+            }
+          }
+        },
+        "LocalDevContainerDockerfile": {
+          "type": "object",
+          "additionalProperties": false,
+          "required": [
+            "type"
+          ],
+          "properties": {
+            "type": {
+              "type": "string",
+              "const": "dockerfile"
+            },
+            "file": {
+              "type": "string"
+            }
+          }
+        }
+      },
       "type": "object",
       "additionalProperties": false,
       "required": [
@@ -40,53 +111,15 @@
             },
             "local": {
               "title": "LocalDevContainer",
-              "type": "object",
-              "additionalProperties": false,
-              "required": [
-                "image"
-              ],
-              "properties": {
-                "image": {
-                  "type": "string"
-                },
-                "options": {
-                  "type": "object",
-                  "additionalProperties": true
-                },
-                "userHome": {
-                  "type": "string"
-                },
-                "workingDir": {
-                  "type": "string"
+              "description": "if type is \"docker\" or empty - Local development container using a fixed docker image. User code will be mounted into the container.\nif type is \"dockerfile\" - Local development container using a Dockerfile. User code will be built into the container.",
+              "oneOf": [
+                {
+                  "$ref": "#/definitions/LocalDevContainerDocker"
                 },
-                "healthcheck": {
-                  "type": "string"
-                },
-                "HostConfig": {
-                  "type": "object",
-                  "additionalProperties": true
-                },
-                "Labels": {
-                  "type": "object",
-                  "additionalProperties": true
-                },
-                "Env": {
-                  "type": "array",
-                  "items": {
-                    "type": "string"
-                  }
-                },
-                "handlers": {
-                  "title": "LocalDevContainerHandlers",
-                  "type": "object",
-                  "additionalProperties": false,
-                  "properties": {
-                    "onCreate": {
-                      "type": "string"
-                    }
-                  }
+                {
+                  "$ref": "#/definitions/LocalDevContainerDockerfile"
                 }
-              }
+              ]
             }
           }
         }
diff --git a/packages/npm/src/types/index.ts b/packages/npm/src/types/index.ts
index 193cea4..91b311c 100644
--- a/packages/npm/src/types/index.ts
+++ b/packages/npm/src/types/index.ts
@@ -510,22 +510,36 @@ export interface LanguageTarget {
 }
 
 export interface LanguageTargetSpec {
-    icon?:       IconValue;
+    icon?: IconValue;
+    /**
+     * if type is "docker" or empty - Local development container using a fixed docker image.
+     * User code will be mounted into the container.
+     * if type is "dockerfile" - Local development container using a Dockerfile. User code will
+     * be built into the container.
+     */
     local:       LocalDevContainer;
     schema?:     { [key: string]: any };
     versioning?: Versioning[];
 }
 
+/**
+ * if type is "docker" or empty - Local development container using a fixed docker image.
+ * User code will be mounted into the container.
+ * if type is "dockerfile" - Local development container using a Dockerfile. User code will
+ * be built into the container.
+ */
 export interface LocalDevContainer {
     Env?:         string[];
     handlers?:    LocalDevContainerHandlers;
     healthcheck?: string;
     HostConfig?:  { [key: string]: any };
-    image:        string;
+    image?:       string;
     Labels?:      { [key: string]: any };
     options?:     { [key: string]: any };
+    type?:        string;
     userHome?:    string;
     workingDir?:  string;
+    file?:        string;
 }
 
 export interface LocalDevContainerHandlers {
diff --git a/schemas/concepts/language-target.yml b/schemas/concepts/language-target.yml
index 58e2323..a478538 100644
--- a/schemas/concepts/language-target.yml
+++ b/schemas/concepts/language-target.yml
@@ -8,6 +8,56 @@ spec:
   schema:
     $id: /core/language-target
     $schema: http://json-schema.org/draft-07/schema#
+    definitions:
+      LocalDevContainerDocker:
+          type: object
+          additionalProperties: false
+          required:
+            - image
+          properties:
+            type:
+              type: string
+              const: docker
+            image:
+              type: string
+            options:
+              type: object
+              additionalProperties: true
+            userHome:
+              type: string
+            workingDir:
+              type: string
+            healthcheck:
+              type: string
+            HostConfig:
+              type: object
+              additionalProperties: true
+            Labels:
+              type: object
+              additionalProperties: true
+            Env:
+              type: array
+              items:
+                type: string
+            handlers:
+              title: LocalDevContainerHandlers
+              type: object
+              additionalProperties: false
+              properties:
+                onCreate:
+                  type: string
+      LocalDevContainerDockerfile:
+        type: object
+        additionalProperties: false
+        required:
+          - type
+        properties:
+          type:
+            type: string
+            const: dockerfile
+          file:
+            type: string
+
     type: object
     additionalProperties: false
     required:
@@ -36,36 +86,9 @@ spec:
             $ref: /core/icon-value
           local:
             title: LocalDevContainer
-            type: object
-            additionalProperties: false
-            required:
-              - image
-            properties:
-              image:
-                type: string
-              options:
-                type: object
-                additionalProperties: true
-              userHome:
-                type: string
-              workingDir:
-                type: string
-              healthcheck:
-                type: string
-              HostConfig:
-                type: object
-                additionalProperties: true
-              Labels:
-                type: object
-                additionalProperties: true
-              Env:
-                  type: array
-                  items:
-                      type: string
-              handlers:
-                title: LocalDevContainerHandlers
-                type: object
-                additionalProperties: false
-                properties:
-                  onCreate:
-                    type: string
\ No newline at end of file
+            description: |- 
+              if type is "docker" or empty - Local development container using a fixed docker image. User code will be mounted into the container.
+              if type is "dockerfile" - Local development container using a Dockerfile. User code will be built into the container.
+            oneOf:
+              - $ref: '#/definitions/LocalDevContainerDocker'
+              - $ref: '#/definitions/LocalDevContainerDockerfile'