diff --git a/.changeset/polite-cooks-watch.md b/.changeset/polite-cooks-watch.md
new file mode 100644
index 0000000..fa8f0af
--- /dev/null
+++ b/.changeset/polite-cooks-watch.md
@@ -0,0 +1,5 @@
+---
+"koa-oas3": minor
+---
+
+Update oas3-chow-chow to 1.2.0
diff --git a/README.md b/README.md
index 1a9080b..5116bf0 100644
--- a/README.md
+++ b/README.md
@@ -76,6 +76,8 @@ Pull requests, issues and comments welcome. For pull requests:
 * Follow the existing style
 * Separate unrelated changes into multiple pull requests
 * See the existing issues for things to start contributing.
+* Generate changeset using `yarn changeset`
+* If there are dependency changes, update lock file with `yarn install`
 
 For bigger changes, make sure you start a discussion first by creating an issue and explaining the intended change.
 
diff --git a/package.json b/package.json
index cd60c30..8d71315 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
     "koa-bodyparser": "^4.2.1",
     "koa-compose": "^4.1.0",
     "oas-validator": "^5.0.3",
-    "oas3-chow-chow": "^1.1.3",
+    "oas3-chow-chow": "^1.2.0",
     "@types/qs": "^6.9.0",
     "qs": "^6.9.1"
   },
diff --git a/yarn.lock b/yarn.lock
index 07faeff..737da56 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2905,10 +2905,10 @@ json-parse-better-errors@^1.0.1:
   resolved "https://registry.yarnpkg.com/json-parse-better-errors/-/json-parse-better-errors-1.0.2.tgz#bb867cfb3450e69107c131d1c514bab3dc8bcaa9"
   integrity sha512-mrqyZKfX5EhL7hvqcV6WG1yYjnjeuYDzDhhcAAUrq8Po85NBQBJP+ZDUT75qZQ98IkUoBqdkExkukOU7Ts2wrw==
 
-json-schema-deref-sync@^0.13.0:
-  version "0.13.0"
-  resolved "https://packages.atlassian.com/api/npm/npm-remote/json-schema-deref-sync/-/json-schema-deref-sync-0.13.0.tgz#cb08b4ff435a48b5a149652d7750fdd071009823"
-  integrity sha1-ywi0/0NaSLWhSWUtd1D90HEAmCM=
+json-schema-deref-sync@^0.14.0:
+  version "0.14.0"
+  resolved "https://registry.yarnpkg.com/json-schema-deref-sync/-/json-schema-deref-sync-0.14.0.tgz#d55cdb8e3d7c26f63f28ffe67601ad2f69bfd779"
+  integrity sha512-yGR1xmhdiD6R0MSrwWcFxQzAj5b3i5Gb/mt5tvQKgFMMeNe0KZYNEN/jWr7G+xn39Azqgcvk4ZKMs8dQl8e4wA==
   dependencies:
     clone "^2.1.2"
     dag-map "~1.0.0"
@@ -3520,14 +3520,14 @@ oas-validator@^5.0.3:
     should "^13.2.1"
     yaml "^1.10.0"
 
-oas3-chow-chow@^1.1.3:
-  version "1.1.3"
-  resolved "https://registry.yarnpkg.com/oas3-chow-chow/-/oas3-chow-chow-1.1.3.tgz#d41179e053f9139755ff67c95ed8bcbbb5e4abb8"
-  integrity sha512-LQZLJGAQUctiMf4j//x59zEGO0I1UzWnVJebq6de2EJH+0UAMPRa8x8zCweWOua8XWhjT27vFEzVRIX4rcxxyQ==
+oas3-chow-chow@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/oas3-chow-chow/-/oas3-chow-chow-1.2.0.tgz#1e7ee31814c926cca26f77a8e66b61acfc63b155"
+  integrity sha512-utUc8aeGr7v7K7bf+4Q4T8+C0qoCbrA17+JUg2FOQ9nfeK1UjJknS8iam3IZg/ZIl05KUUBbl7C3c+dzaCx0hQ==
   dependencies:
     ajv "^6.12.3"
     better-ajv-errors "^0.6.7"
-    json-schema-deref-sync "^0.13.0"
+    json-schema-deref-sync "^0.14.0"
     openapi3-ts "^1.3.0"
     xregexp "^4.2.4"