diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4bffc903f..e2c6e6b8f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+### [1.43.2](https://github.com/rudderlabs/rudder-config-schema/compare/v1.43.1...v1.43.2) (2023-08-01)
+
+
+### Bug Fixes
+
+* **ga4:** firebaseAppId config field issue ([3d1bccc](https://github.com/rudderlabs/rudder-config-schema/commit/3d1bccc3a06d70c5052347c51e4bb34865529727))
+
 ### [1.43.1](https://github.com/rudderlabs/rudder-config-schema/compare/v1.43.0...v1.43.1) (2023-07-28)
 
 ## [1.43.0](https://github.com/rudderlabs/rudder-config-schema/compare/v1.42.2...v1.43.0) (2023-07-24)
diff --git a/package-lock.json b/package-lock.json
index 22b73123f..61e00364f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "rudder-config-schema",
-  "version": "1.43.1",
+  "version": "1.43.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "rudder-config-schema",
-      "version": "1.43.1",
+      "version": "1.43.2",
       "license": "MIT",
       "dependencies": {
         "ajv": "^8.12.0",
diff --git a/package.json b/package.json
index 98312b657..870b018b8 100755
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "rudder-config-schema",
-  "version": "1.43.1",
+  "version": "1.43.2",
   "description": "",
   "main": "src/index.ts",
   "private": true,
diff --git a/src/configurations/destinations/ga4/schema.json b/src/configurations/destinations/ga4/schema.json
index 3bca645fc..d9dd232a9 100644
--- a/src/configurations/destinations/ga4/schema.json
+++ b/src/configurations/destinations/ga4/schema.json
@@ -1,26 +1,35 @@
 {
   "configSchema": {
     "$schema": "http://json-schema.org/draft-07/schema#",
-    "required": ["apiSecret", "typesOfClient", "measurementId", "firebaseAppId"],
+    "required": [
+      "apiSecret",
+      "typesOfClient"
+    ],
     "type": "object",
     "properties": {
       "apiSecret": {
         "type": "string",
         "pattern": "(^\\{\\{.*\\|\\|(.*)\\}\\}$)|(^env[.].+)|^(.{0,100})$"
       },
-      "typesOfClient": { "type": "string", "enum": ["gtag", "firebase"], "default": "gtag" },
-      "measurementId": {
+      "typesOfClient": {
         "type": "string",
-        "pattern": "(^\\{\\{.*\\|\\|(.*)\\}\\}$)|(^env[.].+)|^(G-.{1,100})$|^$"
+        "enum": [
+          "gtag",
+          "firebase"
+        ],
+        "default": "gtag"
       },
-      "firebaseAppId": {
-        "type": "string",
-        "pattern": "(^\\{\\{.*\\|\\|(.*)\\}\\}$)|(^env[.].+)|^(.{0,100})$"
+      "debugMode": {
+        "type": "boolean",
+        "default": false
       },
-      "debugMode": { "type": "boolean", "default": false },
       "eventFilteringOption": {
         "type": "string",
-        "enum": ["disable", "whitelistedEvents", "blacklistedEvents"],
+        "enum": [
+          "disable",
+          "whitelistedEvents",
+          "blacklistedEvents"
+        ],
         "default": "disable"
       },
       "whitelistedEvents": {
@@ -61,30 +70,130 @@
       },
       "capturePageView": {
         "type": "object",
-        "properties": { "web": { "type": "string", "enum": ["rs", "gtag"], "default": "rs" } }
+        "properties": {
+          "web": {
+            "type": "string",
+            "enum": [
+              "rs",
+              "gtag"
+            ],
+            "default": "rs"
+          }
+        }
+      },
+      "debugView": {
+        "type": "object",
+        "properties": {
+          "web": {
+            "type": "boolean"
+          }
+        }
+      },
+      "extendPageViewParams": {
+        "type": "object",
+        "properties": {
+          "web": {
+            "type": "boolean"
+          }
+        }
       },
-      "debugView": { "type": "object", "properties": { "web": { "type": "boolean" } } },
-      "extendPageViewParams": { "type": "object", "properties": { "web": { "type": "boolean" } } },
       "overrideClientAndSessionId": {
         "type": "object",
-        "properties": { "web": { "type": "boolean" } }
+        "properties": {
+          "web": {
+            "type": "boolean"
+          }
+        }
       },
       "useNativeSDK": {
         "type": "object",
         "properties": {
-          "android": { "type": "boolean" },
-          "ios": { "type": "boolean" },
-          "web": { "type": "boolean" }
+          "android": {
+            "type": "boolean"
+          },
+          "ios": {
+            "type": "boolean"
+          },
+          "web": {
+            "type": "boolean"
+          }
         }
       },
       "connectionMode": {
         "type": "object",
         "properties": {
-          "android": { "type": "string", "enum": ["cloud", "device"] },
-          "ios": { "type": "string", "enum": ["cloud", "device"] },
-          "web": { "type": "string", "enum": ["cloud", "device", "hybrid"] }
+          "android": {
+            "type": "string",
+            "enum": [
+              "cloud",
+              "device"
+            ]
+          },
+          "ios": {
+            "type": "string",
+            "enum": [
+              "cloud",
+              "device"
+            ]
+          },
+          "web": {
+            "type": "string",
+            "enum": [
+              "cloud",
+              "device",
+              "hybrid"
+            ]
+          }
+        }
+      }
+    },
+    "allOf": [
+      {
+        "if": {
+          "properties": {
+            "typesOfClient": {
+              "const": "gtag"
+            }
+          },
+          "required": [
+            "typesOfClient"
+          ]
+        },
+        "then": {
+          "properties": {
+            "measurementId": {
+              "type": "string",
+              "pattern": "(^\\{\\{.*\\|\\|(.*)\\}\\}$)|(^env[.].+)|^(G-.{1,100})$|^$"
+            }
+          },
+          "required": [
+            "measurementId"
+          ]
+        }
+      },
+      {
+        "if": {
+          "properties": {
+            "typesOfClient": {
+              "const": "firebase"
+            }
+          },
+          "required": [
+            "typesOfClient"
+          ]
+        },
+        "then": {
+          "properties": {
+            "firebaseAppId": {
+              "type": "string",
+              "pattern": "(^\\{\\{.*\\|\\|(.*)\\}\\}$)|(^env[.].+)|^(.{1,100})$"
+            }
+          },
+          "required": [
+            "firebaseAppId"
+          ]
         }
       }
-    }
+    ]
   }
-}
+}
\ No newline at end of file
diff --git a/src/configurations/destinations/ga4/ui-config.json b/src/configurations/destinations/ga4/ui-config.json
index da8f4bb49..e28a34143 100644
--- a/src/configurations/destinations/ga4/ui-config.json
+++ b/src/configurations/destinations/ga4/ui-config.json
@@ -68,7 +68,7 @@
                     },
                     "label": "Firebase App Id",
                     "configKey": "firebaseAppId",
-                    "regex": "(^\\{\\{.*\\|\\|(.*)\\}\\}$)|(^env[.].+)|^(.{0,100})$",
+                    "regex": "(^\\{\\{.*\\|\\|(.*)\\}\\}$)|(^env[.].+)|^(.{1,100})$",
                     "regexErrorMessage": "Invalid Firebase App Id",
                     "note": "Enter the ID associated with your stream.  Find this under Admin > Data Streams > choose your stream > Firebase App ID",
                     "placeholder": "e.g: 2:637908496727:web:a4284b4c99e329d5",
diff --git a/test/data/validation/destinations/ga4.json b/test/data/validation/destinations/ga4.json
index d2f0c3594..f92425151 100644
--- a/test/data/validation/destinations/ga4.json
+++ b/test/data/validation/destinations/ga4.json
@@ -81,7 +81,8 @@
     },
     "result": false,
     "err": [
-      "measurementId must match pattern \"(^\\{\\{.*\\|\\|(.*)\\}\\}$)|(^env[.].+)|^(G-.{1,100})$|^$\""
+      "measurementId must match pattern \"(^\\{\\{.*\\|\\|(.*)\\}\\}$)|(^env[.].+)|^(G-.{1,100})$|^$\"",
+      " must match \"then\" schema"
     ]
   },
   {
@@ -294,4 +295,4 @@
     },
     "result": true
   }
-]
+]
\ No newline at end of file