diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 9e1cdeda32..e5c9603757 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.21.1"
+  ".": "1.21.2"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 20e8976936..889e26f7d3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 1.21.2 (2024-04-17)
+
+Full Changelog: [v1.21.1...v1.21.2](https://github.com/openai/openai-python/compare/v1.21.1...v1.21.2)
+
+### Chores
+
+* **internal:** add lru_cache helper function ([#1329](https://github.com/openai/openai-python/issues/1329)) ([cbeebfc](https://github.com/openai/openai-python/commit/cbeebfcca8bf1a3feb4462a79e10099bda5bed84))
+
 ## 1.21.1 (2024-04-17)
 
 Full Changelog: [v1.21.0...v1.21.1](https://github.com/openai/openai-python/compare/v1.21.0...v1.21.1)
diff --git a/pyproject.toml b/pyproject.toml
index 0ab25048b1..b593179128 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "openai"
-version = "1.21.1"
+version = "1.21.2"
 description = "The official Python library for the openai API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/openai/_utils/__init__.py b/src/openai/_utils/__init__.py
index 5697894192..31b5b22799 100644
--- a/src/openai/_utils/__init__.py
+++ b/src/openai/_utils/__init__.py
@@ -6,6 +6,7 @@
     is_list as is_list,
     is_given as is_given,
     is_tuple as is_tuple,
+    lru_cache as lru_cache,
     is_mapping as is_mapping,
     is_tuple_t as is_tuple_t,
     parse_date as parse_date,
diff --git a/src/openai/_utils/_utils.py b/src/openai/_utils/_utils.py
index 93c95517a9..5123a230f1 100644
--- a/src/openai/_utils/_utils.py
+++ b/src/openai/_utils/_utils.py
@@ -389,3 +389,11 @@ def get_async_library() -> str:
         return sniffio.current_async_library()
     except Exception:
         return "false"
+
+
+def lru_cache(*, maxsize: int | None = 128) -> Callable[[CallableT], CallableT]:
+    """A version of functools.lru_cache that retains the type signature
+    for the wrapped function arguments.
+    """
+    wrapper = functools.lru_cache(maxsize=maxsize)
+    return cast(Any, wrapper)  # type: ignore[no-any-return]
diff --git a/src/openai/_version.py b/src/openai/_version.py
index 4bb6604548..df70bd1a2c 100644
--- a/src/openai/_version.py
+++ b/src/openai/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "openai"
-__version__ = "1.21.1"  # x-release-please-version
+__version__ = "1.21.2"  # x-release-please-version