diff --git a/packages/graphql-language-service-server/src/GraphQLCache.ts b/packages/graphql-language-service-server/src/GraphQLCache.ts
index fcc5a3fc297..4480b029799 100644
--- a/packages/graphql-language-service-server/src/GraphQLCache.ts
+++ b/packages/graphql-language-service-server/src/GraphQLCache.ts
@@ -671,7 +671,7 @@ export class GraphQLCache implements GraphQLCacheInterface {
     return schema;
   };
 
-  _invalidateSchemaCacheForProject(projectConfig: GraphQLProjectConfig) {
+  invalidateSchemaCacheForProject(projectConfig: GraphQLProjectConfig) {
     const schemaKey = this._getSchemaCacheKeyForProject(
       projectConfig,
     ) as string;
diff --git a/packages/graphql-language-service-server/src/MessageProcessor.ts b/packages/graphql-language-service-server/src/MessageProcessor.ts
index 4b52a6f40b4..80e1cb4456b 100644
--- a/packages/graphql-language-service-server/src/MessageProcessor.ts
+++ b/packages/graphql-language-service-server/src/MessageProcessor.ts
@@ -665,6 +665,8 @@ export class MessageProcessor {
           await this._updateObjectTypeDefinition(uri, contents);
 
           const project = this._graphQLCache.getProjectForFile(uri);
+          await this._updateSchemaIfChanged(project, uri);
+
           let diagnostics: Diagnostic[] = [];
 
           if (
@@ -1138,6 +1140,18 @@ export class MessageProcessor {
     await this._graphQLCache.updateFragmentDefinition(rootDir, uri, contents);
   }
 
+  async _updateSchemaIfChanged(
+    project: GraphQLProjectConfig,
+    uri: Uri,
+  ): Promise<void> {
+    const { dirpath, schema } = project;
+    const schemaFilePath = path.resolve(dirpath, schema as string);
+    const uriFilePath = URI.parse(uri).fsPath;
+    if (uriFilePath === schemaFilePath) {
+      await this._graphQLCache.invalidateSchemaCacheForProject(project);
+    }
+  }
+
   async _updateObjectTypeDefinition(
     uri: Uri,
     contents: CachedContent[],