diff --git a/libs/community/langchain_community/llms/bananadev.py b/libs/community/langchain_community/llms/bananadev.py
index 88ab7f5e58c1f..43ee44b83dfd6 100644
--- a/libs/community/langchain_community/llms/bananadev.py
+++ b/libs/community/langchain_community/llms/bananadev.py
@@ -1,10 +1,10 @@
 import logging
-from typing import Any, Dict, List, Mapping, Optional
+from typing import Any, Dict, List, Mapping, Optional, cast
 
 from langchain_core.callbacks import CallbackManagerForLLMRun
 from langchain_core.language_models.llms import LLM
-from langchain_core.pydantic_v1 import Extra, Field, root_validator
-from langchain_core.utils import get_from_dict_or_env
+from langchain_core.pydantic_v1 import Extra, Field, SecretStr, root_validator
+from langchain_core.utils import convert_to_secret_str, get_from_dict_or_env
 
 from langchain_community.llms.utils import enforce_stop_tokens
 
@@ -38,7 +38,7 @@ class Banana(LLM):
     """Holds any model parameters valid for `create` call not
     explicitly specified."""
 
-    banana_api_key: Optional[str] = None
+    banana_api_key: Optional[SecretStr] = None
 
     class Config:
         """Configuration for this pydantic config."""
@@ -66,8 +66,8 @@ def build_extra(cls, values: Dict[str, Any]) -> Dict[str, Any]:
     @root_validator()
     def validate_environment(cls, values: Dict) -> Dict:
         """Validate that api key and python package exists in environment."""
-        banana_api_key = get_from_dict_or_env(
-            values, "banana_api_key", "BANANA_API_KEY"
+        banana_api_key = convert_to_secret_str(
+            get_from_dict_or_env(values, "banana_api_key", "BANANA_API_KEY")
         )
         values["banana_api_key"] = banana_api_key
         return values
@@ -103,7 +103,7 @@ def _call(
             )
         params = self.model_kwargs or {}
         params = {**params, **kwargs}
-        api_key = self.banana_api_key
+        api_key = cast(SecretStr, self.banana_api_key)
         model_key = self.model_key
         model_url_slug = self.model_url_slug
         model_inputs = {
@@ -113,7 +113,7 @@ def _call(
         }
         model = Client(
             # Found in main dashboard
-            api_key=api_key,
+            api_key=api_key.get_secret_value(),
             # Both found in model details page
             model_key=model_key,
             url=f"https://{model_url_slug}.run.banana.dev",
diff --git a/libs/community/tests/unit_tests/llms/test_bananadev.py b/libs/community/tests/unit_tests/llms/test_bananadev.py
new file mode 100644
index 0000000000000..ea219cc815e15
--- /dev/null
+++ b/libs/community/tests/unit_tests/llms/test_bananadev.py
@@ -0,0 +1,41 @@
+"""Test Banana llm"""
+from typing import cast
+
+from langchain_core.pydantic_v1 import SecretStr
+from pytest import CaptureFixture, MonkeyPatch
+
+from langchain_community.llms.bananadev import Banana
+
+
+def test_api_key_is_secret_string() -> None:
+    llm = Banana(banana_api_key="secret-api-key")
+    assert isinstance(llm.banana_api_key, SecretStr)
+
+
+def test_api_key_masked_when_passed_from_env(
+    monkeypatch: MonkeyPatch, capsys: CaptureFixture
+) -> None:
+    """Test initialization with an API key provided via an env variable"""
+    monkeypatch.setenv("BANANA_API_KEY", "secret-api-key")
+    llm = Banana()
+    print(llm.banana_api_key, end="")  # noqa: T201
+    captured = capsys.readouterr()
+
+    assert captured.out == "**********"
+
+
+def test_api_key_masked_when_passed_via_constructor(
+    capsys: CaptureFixture,
+) -> None:
+    """Test initialization with an API key provided via the initializer"""
+    llm = Banana(banana_api_key="secret-api-key")
+    print(llm.banana_api_key, end="")  # noqa: T201
+    captured = capsys.readouterr()
+
+    assert captured.out == "**********"
+
+
+def test_uses_actual_secret_value_from_secretstr() -> None:
+    """Test that actual secret is retrieved using `.get_secret_value()`."""
+    llm = Banana(banana_api_key="secret-api-key")
+    assert cast(SecretStr, llm.banana_api_key).get_secret_value() == "secret-api-key"