diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 1a5d6cf..0232446 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,3 +1,14 @@
+2.2.2 (2021-05-10)
+==================
+
+**Fixes:**
+
+- Ensure that Operation ID is an optional value (#178)
+
+**Other:**
+
+- Depend on typing-extensions (#179)
+
 2.2.1 (2021-05-09)
 ==================
 
diff --git a/pyproject.toml b/pyproject.toml
index e1c97a6..4007219 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,7 +31,7 @@ virtual_env = "./.venv/"
 
 [tool.poetry]
 name = "rororo"
-version = "2.2.1"
+version = "2.2.2"
 description = "aiohttp.web OpenAPI 3 schema first server applications."
 authors = ["Igor Davydenko <iam@igordavydenko.com>"]
 license = "BSD-3-Clause"
diff --git a/src/rororo/__init__.py b/src/rororo/__init__.py
index 8827e1c..49ac8eb 100644
--- a/src/rororo/__init__.py
+++ b/src/rororo/__init__.py
@@ -39,4 +39,4 @@
 
 __author__ = "Igor Davydenko"
 __license__ = "BSD-3-Clause"
-__version__ = "2.2.1"
+__version__ = "2.2.2"
diff --git a/tests/rororo/openapi.json b/tests/rororo/openapi.json
index 3cecfd2..b781346 100644
--- a/tests/rororo/openapi.json
+++ b/tests/rororo/openapi.json
@@ -2,7 +2,7 @@
   "openapi": "3.0.3",
   "info": {
     "title": "rororo",
-    "version": "2.2.1",
+    "version": "2.2.2",
     "contact": {
       "name": "Igor Davydenko (developer)",
       "url": "https://igordavydenko.com",
diff --git a/tests/rororo/openapi.yaml b/tests/rororo/openapi.yaml
index 98c43b3..1f8ec89 100644
--- a/tests/rororo/openapi.yaml
+++ b/tests/rororo/openapi.yaml
@@ -2,7 +2,7 @@ openapi: "3.0.3"
 
 info:
   title: "rororo"
-  version: "2.2.1"
+  version: "2.2.2"
   contact:
     name: "Igor Davydenko (developer)"
     url: "https://igordavydenko.com"