diff --git a/packages/graphql-playground-electron/package.json b/packages/graphql-playground-electron/package.json
index 69530c148..adb08afb0 100644
--- a/packages/graphql-playground-electron/package.json
+++ b/packages/graphql-playground-electron/package.json
@@ -4,7 +4,7 @@
   "homepage": "https://github.com/graphcool/graphql-playground",
   "repository": "graphcool/graphql-playground",
   "description": "GraphQL IDE for better development workflows (GraphQL Subscriptions, interactive docs & collaboration)",
-  "version": "1.6.2",
+  "version": "1.6.3",
   "author": {
     "name": "Graphcool",
     "email": "hello@graph.cool",
diff --git a/packages/graphql-playground-middleware-express/package.json b/packages/graphql-playground-middleware-express/package.json
index 0dc6a4a9d..691055540 100644
--- a/packages/graphql-playground-middleware-express/package.json
+++ b/packages/graphql-playground-middleware-express/package.json
@@ -1,6 +1,6 @@
 {
   "name": "graphql-playground-middleware-express",
-  "version": "1.7.2",
+  "version": "1.7.3",
   "homepage": "https://github.com/graphcool/graphql-playground/tree/master/packages/graphql-playground-middleware-express",
   "description": "GraphQL IDE for better development workflows (GraphQL Subscriptions, interactive docs & collaboration).",
   "contributors": [
@@ -14,7 +14,7 @@
   "files": [
     "dist"
   ],
-  "playgroundVersion": "1.7.2",
+  "playgroundVersion": "1.7.4",
   "scripts": {
     "build": "rimraf dist && tsc",
     "prepare": "npm run build"
diff --git a/packages/graphql-playground-middleware-hapi/package-lock.json b/packages/graphql-playground-middleware-hapi/package-lock.json
index 910a04ca8..9ee121d9b 100644
--- a/packages/graphql-playground-middleware-hapi/package-lock.json
+++ b/packages/graphql-playground-middleware-hapi/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "graphql-playground-middleware-hapi",
-  "version": "1.7.2",
+  "version": "1.7.3",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/packages/graphql-playground-middleware-hapi/package.json b/packages/graphql-playground-middleware-hapi/package.json
index 7b129ea00..abb117691 100644
--- a/packages/graphql-playground-middleware-hapi/package.json
+++ b/packages/graphql-playground-middleware-hapi/package.json
@@ -1,6 +1,6 @@
 {
   "name": "graphql-playground-middleware-hapi",
-  "version": "1.7.2",
+  "version": "1.7.3",
   "homepage": "https://github.com/graphcool/graphql-playground/tree/master/packages/graphql-playground-middleware-hapi",
   "description": "GraphQL IDE for better development workflows (GraphQL Subscriptions, interactive docs & collaboration).",
   "contributors": [
@@ -15,7 +15,7 @@
   "files": [
     "dist"
   ],
-  "playgroundVersion": "1.7.2",
+  "playgroundVersion": "1.7.4",
   "scripts": {
     "build": "rimraf dist && tsc",
     "prepare": "npm run build"
diff --git a/packages/graphql-playground-middleware-koa/package.json b/packages/graphql-playground-middleware-koa/package.json
index 0eae93a8f..168535ce7 100644
--- a/packages/graphql-playground-middleware-koa/package.json
+++ b/packages/graphql-playground-middleware-koa/package.json
@@ -1,6 +1,6 @@
 {
   "name": "graphql-playground-middleware-koa",
-  "version": "1.6.3",
+  "version": "1.6.4",
   "homepage": "https://github.com/graphcool/graphql-playground/tree/master/packages/graphql-playground-middleware-koa",
   "description": "GraphQL IDE for better development workflows (GraphQL Subscriptions, interactive docs & collaboration).",
   "contributors": [
@@ -14,7 +14,7 @@
   "files": [
     "dist"
   ],
-  "playgroundVersion": "1.7.2",
+  "playgroundVersion": "1.7.4",
   "scripts": {
     "build": "rimraf dist && tsc",
     "prepare": "npm run build"
diff --git a/packages/graphql-playground-middleware-lambda/package.json b/packages/graphql-playground-middleware-lambda/package.json
index 7bb3360f2..471735907 100644
--- a/packages/graphql-playground-middleware-lambda/package.json
+++ b/packages/graphql-playground-middleware-lambda/package.json
@@ -1,6 +1,6 @@
 {
   "name": "graphql-playground-middleware-lambda",
-  "version": "1.7.2",
+  "version": "1.7.3",
   "homepage": "https://github.com/graphcool/graphql-playground/tree/master/packages/graphql-playground-middleware-lambada",
   "description": "GraphQL IDE for better development workflows (GraphQL Subscriptions, interactive docs & collaboration).",
   "contributors": [
@@ -14,7 +14,7 @@
   "files": [
     "dist"
   ],
-  "playgroundVersion": "1.7.2",
+  "playgroundVersion": "1.7.4",
   "scripts": {
     "build": "rimraf dist && tsc",
     "prepare": "npm run build"
diff --git a/packages/graphql-playground-react/package.json b/packages/graphql-playground-react/package.json
index cd2728396..05d050bb8 100644
--- a/packages/graphql-playground-react/package.json
+++ b/packages/graphql-playground-react/package.json
@@ -1,6 +1,6 @@
 {
   "name": "graphql-playground-react",
-  "version": "1.7.2",
+  "version": "1.7.4",
   "main": "./lib/lib.js",
   "typings": "./lib/lib.d.ts",
   "description": "GraphQL IDE for better development workflows (GraphQL Subscriptions, interactive docs & collaboration).",
diff --git a/scripts/release-html.sh b/scripts/release-html.sh
index fcb8eb42d..dd9cbf737 100755
--- a/scripts/release-html.sh
+++ b/scripts/release-html.sh
@@ -1,5 +1,10 @@
 #!/bin/bash
 
+if ! [ -x "$(command -v jq)" ]; then
+  echo 'Error: jq is not installed.' >&2
+  exit 1
+fi
+
 set -e
 
 cd packages
diff --git a/scripts/release-react.sh b/scripts/release-react.sh
index 77984da09..4c32f20cd 100755
--- a/scripts/release-react.sh
+++ b/scripts/release-react.sh
@@ -1,5 +1,10 @@
 #!/bin/bash
 
+if ! [ -x "$(command -v jq)" ]; then
+  echo 'Error: jq is not installed.' >&2
+  exit 1
+fi
+
 set -e
 
 cd packages