diff --git a/types/yargs/index.d.ts b/types/yargs/index.d.ts
index 02d4c6cb69..db8d48d14d 100644
--- a/types/yargs/index.d.ts
+++ b/types/yargs/index.d.ts
@@ -5,6 +5,7 @@
 //                 Jeffery Grajkowski <https://github.com/pushplay>
 //                 Jeff Kenney <https://github.com/jeffkenney>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
 
 // unified-signatures: Because there is useful information in the argument names of the overloaded signatures
 // prefer-method-signature: Because it makes more sense for optional functions provided in options objects
@@ -119,11 +120,11 @@ declare namespace yargs {
         choices(key: string, values: Choices): Argv;
 
         config(): Argv;
-        config(explicitConfigurationObject: any): Argv;
-        config(key: string, description?: string, parseFn?: (configPath: string) => any): Argv;
-        config(keys: string[], description?: string, parseFn?: (configPath: string) => any): Argv;
-        config(key: string, parseFn: (configPath: string) => any): Argv;
-        config(keys: string[], parseFn: (configPath: string) => any): Argv;
+        config(explicitConfigurationObject: object): Argv;
+        config(key: string, description?: string, parseFn?: (configPath: string) => object): Argv;
+        config(keys: string[], description?: string, parseFn?: (configPath: string) => object): Argv;
+        config(key: string, parseFn: (configPath: string) => object): Argv;
+        config(keys: string[], parseFn: (configPath: string) => object): Argv;
 
         conflicts(key: string, value: string): Argv;
         conflicts(conflicts: { [key: string]: string }): Argv;
@@ -207,7 +208,7 @@ declare namespace yargs {
         choices?: Choices;
         coerce?: (arg: any) => any;
         config?: boolean;
-        configParser?: (configPath: string) => any;
+        configParser?: (configPath: string) => object;
         count?: boolean;
         default?: any;
         defaultDescription?: string;
diff --git a/types/yargs/yargs-tests.ts b/types/yargs/yargs-tests.ts
index 8a0120f80d..2847242fd4 100644
--- a/types/yargs/yargs-tests.ts
+++ b/types/yargs/yargs-tests.ts
@@ -561,7 +561,7 @@ function Argv$commandObject() {
                 choices: ["a", "b", "c"],
                 coerce: f => JSON.stringify(f),
                 config: true,
-                configParser: t => t,
+                configParser: t => JSON.parse(fs.readFileSync(t, "utf8")),
                 count: true,
                 default: "myvalue",
                 defaultDescription: "description",