diff --git a/.changeset/strange-fishes-retire.md b/.changeset/strange-fishes-retire.md
new file mode 100644
index 0000000000..e9440af3e5
--- /dev/null
+++ b/.changeset/strange-fishes-retire.md
@@ -0,0 +1,9 @@
+---
+'@api3/airnode-adapter': minor
+'@api3/airnode-deployer': minor
+'@api3/airnode-examples': minor
+'@api3/airnode-node': minor
+'@api3/airnode-validator': minor
+---
+
+Bump @api3/ois to 1.4.0 with necessary zod version bump to 3.20
diff --git a/packages/airnode-adapter/package.json b/packages/airnode-adapter/package.json
index 442b527bcf..6c8788feea 100644
--- a/packages/airnode-adapter/package.json
+++ b/packages/airnode-adapter/package.json
@@ -19,7 +19,7 @@
     "test:watch": "yarn test:ts --watch"
   },
   "dependencies": {
-    "@api3/ois": "1.3.0",
+    "@api3/ois": "1.4.0",
     "@api3/promise-utils": "^0.3.0",
     "axios": "1.1.3",
     "bignumber.js": "^9.1.0",
diff --git a/packages/airnode-adapter/test/fixtures/ois.ts b/packages/airnode-adapter/test/fixtures/ois.ts
index 71db60098a..5e2ecd7db7 100644
--- a/packages/airnode-adapter/test/fixtures/ois.ts
+++ b/packages/airnode-adapter/test/fixtures/ois.ts
@@ -2,7 +2,7 @@ import { OIS } from '@api3/ois';
 
 export function buildOIS(overrides?: Partial<OIS>): OIS {
   return {
-    oisFormat: '1.3.0',
+    oisFormat: '1.4.0',
     version: '1.2.3',
     title: 'Currency Converter API',
     apiSpecifications: {
diff --git a/packages/airnode-deployer/config/config.example.json b/packages/airnode-deployer/config/config.example.json
index b018311b02..f9881b2859 100644
--- a/packages/airnode-deployer/config/config.example.json
+++ b/packages/airnode-deployer/config/config.example.json
@@ -87,7 +87,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.3.0",
+      "oisFormat": "1.4.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-deployer/package.json b/packages/airnode-deployer/package.json
index 804a3f98b7..46906ea934 100644
--- a/packages/airnode-deployer/package.json
+++ b/packages/airnode-deployer/package.json
@@ -41,7 +41,7 @@
     "lodash": "^4.17.21",
     "ora": "^5.4.1",
     "yargs": "^17.6.0",
-    "zod": "^3.19.1"
+    "zod": "^3.20.0"
   },
   "devDependencies": {
     "@google-cloud/functions-framework": "^3.1.2",
diff --git a/packages/airnode-deployer/test/fixtures/config.aws.valid.json b/packages/airnode-deployer/test/fixtures/config.aws.valid.json
index 90ba186557..9c4f3eb781 100644
--- a/packages/airnode-deployer/test/fixtures/config.aws.valid.json
+++ b/packages/airnode-deployer/test/fixtures/config.aws.valid.json
@@ -90,7 +90,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.3.0",
+      "oisFormat": "1.4.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-deployer/test/fixtures/config.gcp.valid.json b/packages/airnode-deployer/test/fixtures/config.gcp.valid.json
index f497a1606f..f6e6d1fab5 100644
--- a/packages/airnode-deployer/test/fixtures/config.gcp.valid.json
+++ b/packages/airnode-deployer/test/fixtures/config.gcp.valid.json
@@ -90,7 +90,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.3.0",
+      "oisFormat": "1.4.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/authenticated-coinmarketcap/config.example.json b/packages/airnode-examples/integrations/authenticated-coinmarketcap/config.example.json
index ac3a324f56..224b4088a9 100644
--- a/packages/airnode-examples/integrations/authenticated-coinmarketcap/config.example.json
+++ b/packages/airnode-examples/integrations/authenticated-coinmarketcap/config.example.json
@@ -78,7 +78,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.3.0",
+      "oisFormat": "1.4.0",
       "title": "CoinMarketCap Basic Authenticated Request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/authenticated-coinmarketcap/create-config.ts b/packages/airnode-examples/integrations/authenticated-coinmarketcap/create-config.ts
index 1b81ecac13..01aa7f3cb1 100644
--- a/packages/airnode-examples/integrations/authenticated-coinmarketcap/create-config.ts
+++ b/packages/airnode-examples/integrations/authenticated-coinmarketcap/create-config.ts
@@ -85,7 +85,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.3.0',
+      oisFormat: '1.4.0',
       title: 'CoinMarketCap Basic Authenticated Request',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/coingecko-cross-chain-authorizer/config.example.json b/packages/airnode-examples/integrations/coingecko-cross-chain-authorizer/config.example.json
index f00abb0c97..af6422c402 100644
--- a/packages/airnode-examples/integrations/coingecko-cross-chain-authorizer/config.example.json
+++ b/packages/airnode-examples/integrations/coingecko-cross-chain-authorizer/config.example.json
@@ -90,7 +90,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.3.0",
+      "oisFormat": "1.4.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/coingecko-cross-chain-authorizer/create-config.ts b/packages/airnode-examples/integrations/coingecko-cross-chain-authorizer/create-config.ts
index e952ed64f5..6b1c3faee7 100644
--- a/packages/airnode-examples/integrations/coingecko-cross-chain-authorizer/create-config.ts
+++ b/packages/airnode-examples/integrations/coingecko-cross-chain-authorizer/create-config.ts
@@ -98,7 +98,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.3.0',
+      oisFormat: '1.4.0',
       title: 'CoinGecko basic request',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/coingecko-post-processing/config.example.json b/packages/airnode-examples/integrations/coingecko-post-processing/config.example.json
index a9e3de245c..4618195394 100644
--- a/packages/airnode-examples/integrations/coingecko-post-processing/config.example.json
+++ b/packages/airnode-examples/integrations/coingecko-post-processing/config.example.json
@@ -78,7 +78,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.3.0",
+      "oisFormat": "1.4.0",
       "title": "CoinGecko coins markets request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/coingecko-post-processing/create-config.ts b/packages/airnode-examples/integrations/coingecko-post-processing/create-config.ts
index daf6173e06..a5a2f82a5f 100644
--- a/packages/airnode-examples/integrations/coingecko-post-processing/create-config.ts
+++ b/packages/airnode-examples/integrations/coingecko-post-processing/create-config.ts
@@ -85,7 +85,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.3.0',
+      oisFormat: '1.4.0',
       title: 'CoinGecko coins markets request',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/coingecko-pre-processing/config.example.json b/packages/airnode-examples/integrations/coingecko-pre-processing/config.example.json
index 3be4e5579e..4d95bae31e 100644
--- a/packages/airnode-examples/integrations/coingecko-pre-processing/config.example.json
+++ b/packages/airnode-examples/integrations/coingecko-pre-processing/config.example.json
@@ -78,7 +78,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.3.0",
+      "oisFormat": "1.4.0",
       "title": "CoinGecko history data request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/coingecko-pre-processing/create-config.ts b/packages/airnode-examples/integrations/coingecko-pre-processing/create-config.ts
index d1e8481afa..962a94a7ff 100644
--- a/packages/airnode-examples/integrations/coingecko-pre-processing/create-config.ts
+++ b/packages/airnode-examples/integrations/coingecko-pre-processing/create-config.ts
@@ -85,7 +85,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.3.0',
+      oisFormat: '1.4.0',
       title: 'CoinGecko history data request',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/coingecko-signed-data/config.example.json b/packages/airnode-examples/integrations/coingecko-signed-data/config.example.json
index 6fc754a614..8413d7dfd7 100644
--- a/packages/airnode-examples/integrations/coingecko-signed-data/config.example.json
+++ b/packages/airnode-examples/integrations/coingecko-signed-data/config.example.json
@@ -86,7 +86,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.3.0",
+      "oisFormat": "1.4.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/coingecko-signed-data/create-config.ts b/packages/airnode-examples/integrations/coingecko-signed-data/create-config.ts
index 48e33fe7f1..6c18abbb1a 100644
--- a/packages/airnode-examples/integrations/coingecko-signed-data/create-config.ts
+++ b/packages/airnode-examples/integrations/coingecko-signed-data/create-config.ts
@@ -93,7 +93,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.3.0',
+      oisFormat: '1.4.0',
       title: 'CoinGecko basic request',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/coingecko-template/config.example.json b/packages/airnode-examples/integrations/coingecko-template/config.example.json
index 44cd19b80d..95fd08a213 100644
--- a/packages/airnode-examples/integrations/coingecko-template/config.example.json
+++ b/packages/airnode-examples/integrations/coingecko-template/config.example.json
@@ -84,7 +84,7 @@
   ],
   "ois": [
     {
-      "oisFormat": "1.3.0",
+      "oisFormat": "1.4.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/coingecko-template/create-config.ts b/packages/airnode-examples/integrations/coingecko-template/create-config.ts
index be9319f30a..d97aa60380 100644
--- a/packages/airnode-examples/integrations/coingecko-template/create-config.ts
+++ b/packages/airnode-examples/integrations/coingecko-template/create-config.ts
@@ -93,7 +93,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   ],
   ois: [
     {
-      oisFormat: '1.3.0',
+      oisFormat: '1.4.0',
       title: 'CoinGecko basic request',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/coingecko-testable/config.example.json b/packages/airnode-examples/integrations/coingecko-testable/config.example.json
index 979d087738..440d8dfb23 100644
--- a/packages/airnode-examples/integrations/coingecko-testable/config.example.json
+++ b/packages/airnode-examples/integrations/coingecko-testable/config.example.json
@@ -86,7 +86,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.3.0",
+      "oisFormat": "1.4.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/coingecko-testable/create-config.ts b/packages/airnode-examples/integrations/coingecko-testable/create-config.ts
index e9cf107d2f..5765209433 100644
--- a/packages/airnode-examples/integrations/coingecko-testable/create-config.ts
+++ b/packages/airnode-examples/integrations/coingecko-testable/create-config.ts
@@ -93,7 +93,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.3.0',
+      oisFormat: '1.4.0',
       title: 'CoinGecko basic request',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/coingecko/config.example.json b/packages/airnode-examples/integrations/coingecko/config.example.json
index 415333febe..f9cc3ca192 100644
--- a/packages/airnode-examples/integrations/coingecko/config.example.json
+++ b/packages/airnode-examples/integrations/coingecko/config.example.json
@@ -78,7 +78,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.3.0",
+      "oisFormat": "1.4.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/coingecko/create-config.ts b/packages/airnode-examples/integrations/coingecko/create-config.ts
index 68a2f4928d..1fcf3c5623 100644
--- a/packages/airnode-examples/integrations/coingecko/create-config.ts
+++ b/packages/airnode-examples/integrations/coingecko/create-config.ts
@@ -85,7 +85,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.3.0',
+      oisFormat: '1.4.0',
       title: 'CoinGecko basic request',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/failing-example/config.example.json b/packages/airnode-examples/integrations/failing-example/config.example.json
index 955dce399b..f69aa11365 100644
--- a/packages/airnode-examples/integrations/failing-example/config.example.json
+++ b/packages/airnode-examples/integrations/failing-example/config.example.json
@@ -78,7 +78,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.3.0",
+      "oisFormat": "1.4.0",
       "title": "Failure Example",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/failing-example/create-config.ts b/packages/airnode-examples/integrations/failing-example/create-config.ts
index 693502fd25..35cb67de30 100644
--- a/packages/airnode-examples/integrations/failing-example/create-config.ts
+++ b/packages/airnode-examples/integrations/failing-example/create-config.ts
@@ -85,7 +85,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.3.0',
+      oisFormat: '1.4.0',
       title: 'Failure Example',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/relay-security-schemes/config.example.json b/packages/airnode-examples/integrations/relay-security-schemes/config.example.json
index 2ce4592727..6b4ac58e89 100644
--- a/packages/airnode-examples/integrations/relay-security-schemes/config.example.json
+++ b/packages/airnode-examples/integrations/relay-security-schemes/config.example.json
@@ -78,7 +78,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.3.0",
+      "oisFormat": "1.4.0",
       "title": "Relay Security Schemes via httpbin",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/relay-security-schemes/create-config.ts b/packages/airnode-examples/integrations/relay-security-schemes/create-config.ts
index 6937a4ffe8..04b7b57011 100644
--- a/packages/airnode-examples/integrations/relay-security-schemes/create-config.ts
+++ b/packages/airnode-examples/integrations/relay-security-schemes/create-config.ts
@@ -85,7 +85,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.3.0',
+      oisFormat: '1.4.0',
       title: 'Relay Security Schemes via httpbin',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/weather-multi-value/config.example.json b/packages/airnode-examples/integrations/weather-multi-value/config.example.json
index 02a813a161..7a5e0945a8 100644
--- a/packages/airnode-examples/integrations/weather-multi-value/config.example.json
+++ b/packages/airnode-examples/integrations/weather-multi-value/config.example.json
@@ -78,7 +78,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.3.0",
+      "oisFormat": "1.4.0",
       "title": "OpenWeather Multiple Encoded Values",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/weather-multi-value/create-config.ts b/packages/airnode-examples/integrations/weather-multi-value/create-config.ts
index 1ed8bbf5ba..f6c6df0fc9 100644
--- a/packages/airnode-examples/integrations/weather-multi-value/create-config.ts
+++ b/packages/airnode-examples/integrations/weather-multi-value/create-config.ts
@@ -85,7 +85,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.3.0',
+      oisFormat: '1.4.0',
       title: 'OpenWeather Multiple Encoded Values',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-node/config/config.example.json b/packages/airnode-node/config/config.example.json
index 7c17209f07..08351630ed 100644
--- a/packages/airnode-node/config/config.example.json
+++ b/packages/airnode-node/config/config.example.json
@@ -79,7 +79,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.3.0",
+      "oisFormat": "1.4.0",
       "version": "1.2.3",
       "title": "Currency Converter API",
       "apiSpecifications": {
diff --git a/packages/airnode-node/package.json b/packages/airnode-node/package.json
index 30de5b2b24..82281361c1 100644
--- a/packages/airnode-node/package.json
+++ b/packages/airnode-node/package.json
@@ -29,7 +29,7 @@
     "@api3/airnode-protocol": "^0.9.0",
     "@api3/airnode-utilities": "^0.9.0",
     "@api3/airnode-validator": "^0.9.0",
-    "@api3/ois": "1.3.0",
+    "@api3/ois": "1.4.0",
     "@api3/promise-utils": "^0.3.0",
     "aws-sdk": "^2.1243.0",
     "dotenv": "^16.0.3",
@@ -38,7 +38,7 @@
     "google-auth-library": "^8.6.0",
     "lodash": "^4.17.21",
     "yargs": "^17.6.0",
-    "zod": "^3.19.1"
+    "zod": "^3.20.0"
   },
   "devDependencies": {
     "@api3/airnode-operation": "^0.9.0",
diff --git a/packages/airnode-node/test/fixtures/config/ois.ts b/packages/airnode-node/test/fixtures/config/ois.ts
index 606afa9169..e99d1380b9 100644
--- a/packages/airnode-node/test/fixtures/config/ois.ts
+++ b/packages/airnode-node/test/fixtures/config/ois.ts
@@ -2,7 +2,7 @@ import { OIS } from '@api3/ois';
 
 export function buildOIS(ois?: Partial<OIS>): OIS {
   return {
-    oisFormat: '1.3.0',
+    oisFormat: '1.4.0',
     version: '1.2.3',
     title: 'Currency Converter API',
     apiSpecifications: {
diff --git a/packages/airnode-validator/package.json b/packages/airnode-validator/package.json
index e47f841a35..218b293be9 100644
--- a/packages/airnode-validator/package.json
+++ b/packages/airnode-validator/package.json
@@ -21,14 +21,14 @@
     "test:e2e:update-snapshot": "yarn test:e2e --updateSnapshot"
   },
   "dependencies": {
-    "@api3/ois": "1.3.0",
+    "@api3/ois": "1.4.0",
     "@api3/promise-utils": "^0.3.0",
     "dotenv": "^16.0.3",
     "ethers": "^5.7.2",
     "lodash": "^4.17.21",
     "ora": "^5.4.1",
     "yargs": "^17.6.0",
-    "zod": "^3.19.1"
+    "zod": "^3.20.0"
   },
   "devDependencies": {
     "@types/yargs": "^17.0.13",
diff --git a/packages/airnode-validator/src/api/api.test.ts b/packages/airnode-validator/src/api/api.test.ts
index cd8341fcca..a6c8200782 100644
--- a/packages/airnode-validator/src/api/api.test.ts
+++ b/packages/airnode-validator/src/api/api.test.ts
@@ -74,6 +74,7 @@ describe('parseConfigWithSecrets', () => {
         minimum: 1,
         type: 'string',
         inclusive: true,
+        exact: false,
         message: 'Secret cannot be empty',
         path: ['AIRNODE_WALLET_MNEMONIC'],
       },
diff --git a/packages/airnode-validator/src/config/config.test.ts b/packages/airnode-validator/src/config/config.test.ts
index 654d4bb866..d08d7c59a0 100644
--- a/packages/airnode-validator/src/config/config.test.ts
+++ b/packages/airnode-validator/src/config/config.test.ts
@@ -96,6 +96,7 @@ describe('gasPriceOracleSchema', () => {
           minimum: 1,
           type: 'array',
           inclusive: true,
+          exact: false,
           message: 'Array must contain at least 1 element(s)',
           path: [],
         },
@@ -379,6 +380,7 @@ describe('apiKey schemas', () => {
             minimum: 30,
             type: 'string',
             inclusive: true,
+            exact: false,
             message: 'String must contain at least 30 character(s)',
             path: ['apiKey'],
           },
@@ -393,6 +395,7 @@ describe('apiKey schemas', () => {
             maximum: 120,
             type: 'string',
             inclusive: true,
+            exact: false,
             message: 'String must contain at most 120 character(s)',
             path: ['apiKey'],
           },
diff --git a/packages/airnode-validator/src/config/config.ts b/packages/airnode-validator/src/config/config.ts
index e0910baffb..47e28e00a0 100644
--- a/packages/airnode-validator/src/config/config.ts
+++ b/packages/airnode-validator/src/config/config.ts
@@ -122,33 +122,28 @@ export const gasPriceOracleStrategySchema = z.discriminatedUnion('gasPriceStrate
   constantGasPriceStrategySchema,
 ]);
 
-export const validateGasPriceOracleStrategies: SuperRefinement<GasPriceOracleConfig> = (gasPriceOracle, ctx) => {
-  const constantGasPriceStrategy = gasPriceOracle.find(
-    (gasPriceOracleStrategy) => gasPriceOracleStrategy.gasPriceStrategy === 'constantGasPrice'
-  );
-
-  // Require at least the constantGasPrice strategy to be defined
-  if (!constantGasPriceStrategy) {
-    ctx.addIssue({
-      code: z.ZodIssueCode.custom,
-      message: `Missing required constantGasPrice strategy`,
-      path: ['gasPriceOracle'],
-    });
-  }
-
-  if (gasPriceOracle[gasPriceOracle.length - 1]?.gasPriceStrategy !== 'constantGasPrice') {
-    ctx.addIssue({
-      code: z.ZodIssueCode.custom,
-      message: `ConstantGasPrice strategy must be set as the last strategy in the array.`,
-      path: ['gasPriceOracle'],
-    });
-  }
-};
-
 export const gasPriceOracleSchema = z
   .array(gasPriceOracleStrategySchema)
   .nonempty()
-  .superRefine(validateGasPriceOracleStrategies);
+  .superRefine((strategies, ctx) => {
+    const constantGasPriceStrategy = strategies.find((strategy) => strategy.gasPriceStrategy === 'constantGasPrice');
+
+    if (!constantGasPriceStrategy) {
+      ctx.addIssue({
+        code: z.ZodIssueCode.custom,
+        message: `Missing required constantGasPrice strategy`,
+        path: ['gasPriceOracle'],
+      });
+    }
+
+    if (strategies[strategies.length - 1]?.gasPriceStrategy !== 'constantGasPrice') {
+      ctx.addIssue({
+        code: z.ZodIssueCode.custom,
+        message: `ConstantGasPrice strategy must be set as the last strategy in the array.`,
+        path: ['gasPriceOracle'],
+      });
+    }
+  });
 
 export const chainOptionsSchema = z
   .object({
@@ -492,4 +487,4 @@ export type Amount = SchemaType<typeof amountSchema>;
 export type EnabledGateway = SchemaType<typeof enabledGatewaySchema>;
 export type MaxConcurrency = SchemaType<typeof maxConcurrencySchema>;
 
-export const availableCloudProviders = Array.from(cloudProviderSchema.options.keys()) as CloudProvider['type'][];
+export const availableCloudProviders = Array.from(cloudProviderSchema.optionsMap.keys()) as CloudProvider['type'][];
diff --git a/packages/airnode-validator/test/fixtures/config.valid.json b/packages/airnode-validator/test/fixtures/config.valid.json
index 981bf020fc..af5e47c572 100644
--- a/packages/airnode-validator/test/fixtures/config.valid.json
+++ b/packages/airnode-validator/test/fixtures/config.valid.json
@@ -79,7 +79,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.3.0",
+      "oisFormat": "1.4.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-validator/test/fixtures/interpolated-config.valid.json b/packages/airnode-validator/test/fixtures/interpolated-config.valid.json
index 50650ac7f4..7f03f22b52 100644
--- a/packages/airnode-validator/test/fixtures/interpolated-config.valid.json
+++ b/packages/airnode-validator/test/fixtures/interpolated-config.valid.json
@@ -83,7 +83,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.3.0",
+      "oisFormat": "1.4.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-validator/test/fixtures/invalid-secret-name/config.json b/packages/airnode-validator/test/fixtures/invalid-secret-name/config.json
index 57a308f0f9..2d288caaa6 100644
--- a/packages/airnode-validator/test/fixtures/invalid-secret-name/config.json
+++ b/packages/airnode-validator/test/fixtures/invalid-secret-name/config.json
@@ -67,7 +67,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.3.0",
+      "oisFormat": "1.4.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-validator/test/fixtures/ois.json b/packages/airnode-validator/test/fixtures/ois.json
index f97d2d2357..ce5382f59b 100644
--- a/packages/airnode-validator/test/fixtures/ois.json
+++ b/packages/airnode-validator/test/fixtures/ois.json
@@ -1,5 +1,5 @@
 {
-  "oisFormat": "1.3.0",
+  "oisFormat": "1.4.0",
   "version": "1.2.3",
   "title": "coinlayer",
   "apiSpecifications": {
diff --git a/yarn.lock b/yarn.lock
index f1ce386821..d24a47c6d4 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -10,13 +10,13 @@
     "@jridgewell/gen-mapping" "^0.1.0"
     "@jridgewell/trace-mapping" "^0.3.9"
 
-"@api3/ois@1.3.0":
-  version "1.3.0"
-  resolved "https://registry.yarnpkg.com/@api3/ois/-/ois-1.3.0.tgz#3780a1bcd439e2fdb1316955d97f5124311ad316"
-  integrity sha512-fdUsK1WwVN6FJUPPwDWpjyJNTg2MCaWYej8rr4bIoFMPvBre9ow7vKMw99+qdAS1P5CZP0Yvba14yacy3f3P4w==
+"@api3/ois@1.4.0":
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/@api3/ois/-/ois-1.4.0.tgz#128e56d8ff5f03b6219aaaa9e5022d1e9ab6dc57"
+  integrity sha512-oPzHipFgGXaTgYCQeU9nx0vaucFZPO1oymMs25v/qfcl+M+i6/xwgmej3o7CFt/dF0q2yNLiZW31Tro7g4AMcA==
   dependencies:
     lodash "^4.17.21"
-    zod "^3.19.1"
+    zod "^3.20.0"
 
 "@api3/promise-utils@^0.3.0":
   version "0.3.0"
@@ -17066,7 +17066,7 @@ zksync-web3@^0.8.1:
   resolved "https://registry.yarnpkg.com/zksync-web3/-/zksync-web3-0.8.1.tgz#db289d8f6caf61f4d5ddc471fa3448d93208dc14"
   integrity sha512-1A4aHPQ3MyuGjpv5X/8pVEN+MdZqMjfVmiweQSRjOlklXYu65wT9BGEOtCmMs5d3gIvLp4ssfTeuR5OCKOD2kw==
 
-zod@^3.19.1:
-  version "3.19.1"
-  resolved "https://registry.yarnpkg.com/zod/-/zod-3.19.1.tgz#112f074a97b50bfc4772d4ad1576814bd8ac4473"
-  integrity sha512-LYjZsEDhCdYET9ikFu6dVPGp2YH9DegXjdJToSzD9rO6fy4qiRYFoyEYwps88OseJlPyl2NOe2iJuhEhL7IpEA==
+zod@^3.20.0:
+  version "3.20.2"
+  resolved "https://registry.yarnpkg.com/zod/-/zod-3.20.2.tgz#068606642c8f51b3333981f91c0a8ab37dfc2807"
+  integrity sha512-1MzNQdAvO+54H+EaK5YpyEy0T+Ejo/7YLHS93G3RnYWh5gaotGHwGeN/ZO687qEDU2y4CdStQYXVHIgrUl5UVQ==