diff --git a/README.md b/README.md
index 317a84cd..5829edba 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,12 @@ Shell example
 CONFIG_PATH=<PATH_TO_CONFIG> ./castai-agent
 ```
 
+## API_KEY from file 
+
+There is a possibility to read API_KEY from file instead of env variable it can be done by using `API_KEY_FILE` env variable.
+This variable points to file that contains API_KEY value.
+
+
 ## Contributing
 
 ### Run the agent in your IDE 
diff --git a/internal/config/config.go b/internal/config/config.go
index 9c845b9b..8426f70d 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -161,6 +161,14 @@ func Get() Config {
 		}
 	}
 
+	if apiKeyFile := os.Getenv("API_KEY_FILE"); apiKeyFile != "" {
+		buf, err := os.ReadFile(apiKeyFile)
+		if err != nil {
+			panic(fmt.Errorf("unable to read api key file: %v", err))
+		}
+		cfg.API.Key = string(buf)
+	}
+
 	if err := viper.Unmarshal(&cfg); err != nil {
 		panic(fmt.Errorf("parsing configuration: %v", err))
 	}