diff --git a/lerna.json b/lerna.json
index 2de86005f..829448134 100644
--- a/lerna.json
+++ b/lerna.json
@@ -2,5 +2,5 @@
   "packages": [
     "packages/*"
   ],
-  "version": "2.5.5"
+  "version": "2.5.6"
 }
diff --git a/packages/cli/package.json b/packages/cli/package.json
index 67502473b..c7004ae36 100644
--- a/packages/cli/package.json
+++ b/packages/cli/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@ampproject/toolbox-cli",
-  "version": "2.5.5",
+  "version": "2.5.6",
   "description": "A Command Line Interface (CLI) for amp-toolbox",
   "main": "index.js",
   "bin": {
@@ -30,11 +30,11 @@
     "@ampproject/toolbox-cache-list": "^2.5.4",
     "@ampproject/toolbox-cache-url": "^2.5.4",
     "@ampproject/toolbox-core": "^2.5.4",
-    "@ampproject/toolbox-linter": "^2.5.4",
-    "@ampproject/toolbox-optimizer": "^2.5.5",
+    "@ampproject/toolbox-linter": "^2.5.6",
+    "@ampproject/toolbox-optimizer": "^2.5.6",
     "@ampproject/toolbox-runtime-fetch": "^2.5.4",
     "@ampproject/toolbox-runtime-version": "^2.5.4",
-    "@ampproject/toolbox-update-cache": "^2.5.4",
+    "@ampproject/toolbox-update-cache": "^2.5.6",
     "minimist": "1.2.5",
     "minimist-options": "4.1.0",
     "node-fetch": "2.6.0"
diff --git a/packages/lighthouse-plugin-amp/package.json b/packages/lighthouse-plugin-amp/package.json
index 18bfa5b9e..86416126f 100644
--- a/packages/lighthouse-plugin-amp/package.json
+++ b/packages/lighthouse-plugin-amp/package.json
@@ -10,7 +10,7 @@
     "amphtml-validator": "1.0.31",
     "node-fetch": "2.6.0"
   },
-  "version": "2.5.4",
+  "version": "2.5.6",
   "main": "./plugin.js",
   "peerDependencies": {
     "lighthouse": ">=6.1.0"
diff --git a/packages/linter/package.json b/packages/linter/package.json
index efb52454a..8e37f19b1 100644
--- a/packages/linter/package.json
+++ b/packages/linter/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@ampproject/toolbox-linter",
-  "version": "2.5.4",
+  "version": "2.5.6",
   "description": "A linter for AMP documents",
   "repository": {
     "type": "git",
diff --git a/packages/optimizer-express/package.json b/packages/optimizer-express/package.json
index b76d689b5..e5013836d 100644
--- a/packages/optimizer-express/package.json
+++ b/packages/optimizer-express/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@ampproject/toolbox-optimizer-express",
-  "version": "2.5.5",
+  "version": "2.5.6",
   "description": "Express middleware for @ampproject/toolbox-optimizer",
   "main": "index.js",
   "repository": {
@@ -25,7 +25,7 @@
   "homepage": "https://github.com/ampproject/amp-toolbox/tree/main/packages/optimizer-express",
   "dependencies": {
     "@ampproject/toolbox-core": "^2.5.4",
-    "@ampproject/toolbox-optimizer": "^2.5.5",
+    "@ampproject/toolbox-optimizer": "^2.5.6",
     "@ampproject/toolbox-runtime-version": "^2.5.4",
     "mime-types": "2.1.27",
     "whatwg-url": "8.1.0"
diff --git a/packages/optimizer/package-lock.json b/packages/optimizer/package-lock.json
index e7f629f49..f9751d3c6 100644
--- a/packages/optimizer/package-lock.json
+++ b/packages/optimizer/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@ampproject/toolbox-optimizer",
-  "version": "2.5.5",
+  "version": "2.5.6",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/packages/optimizer/package.json b/packages/optimizer/package.json
index ce39f04ee..41d428765 100644
--- a/packages/optimizer/package.json
+++ b/packages/optimizer/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@ampproject/toolbox-optimizer",
-  "version": "2.5.5",
+  "version": "2.5.6",
   "description": "Server-side rendering for AMPs.",
   "main": "index.js",
   "repository": {
diff --git a/packages/update-cache/package.json b/packages/update-cache/package.json
index 473a2ce41..84dcec016 100644
--- a/packages/update-cache/package.json
+++ b/packages/update-cache/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@ampproject/toolbox-update-cache",
-  "version": "2.5.4",
+  "version": "2.5.6",
   "description": "Implements the AMP update-cache API, as described at https://developers.google.com/amp/cache/update-cache ",
   "main": "index.js",
   "repository": {