diff --git a/CHANGELOG.md b/CHANGELOG.md
index 09eb2547c6b..7893560f8f9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## Apollo Client 3.6.6 (unreleased)
+## Apollo Client 3.6.6 (2022-05-26)
 
 ### Bug Fixes
 
diff --git a/package-lock.json b/package-lock.json
index 3918ff6b0a3..004614994c7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@apollo/client",
-  "version": "3.6.5",
+  "version": "3.6.6",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@apollo/client",
-      "version": "3.6.5",
+      "version": "3.6.6",
       "license": "MIT",
       "dependencies": {
         "@graphql-typed-document-node/core": "^3.1.1",
diff --git a/package.json b/package.json
index 0e8bb8c88f7..104a5a98c8f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@apollo/client",
-  "version": "3.6.5",
+  "version": "3.6.6",
   "description": "A fully-featured caching GraphQL client.",
   "private": true,
   "keywords": [