diff --git a/lib/main.js b/lib/main.js
index 0b0db1b..445085b 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -62,7 +62,7 @@ var defaults = require( '@stdlib/ndarray-defaults' );
 var isAccessorArray = require( '@stdlib/array-base-assert-is-accessor-array' );
 var accessorSetter = require( '@stdlib/array-base-accessor-setter' );
 var setter = require( '@stdlib/array-base-setter' );
-var format = require( '@stdlib/string-format' );
+var format = require( '@stdlib/error-tools-fmtprodmsg' );
 var validate = require( './validate.js' );
 
 
@@ -299,10 +299,10 @@ function Random( prng, idtypes, odtypes, policies, options ) {
 		return new Random( prng, idtypes, odtypes, policies, options );
 	}
 	if ( !isFunction( prng ) ) {
-		throw new TypeError( format( 'invalid argument. First argument must be a function. Value: `%s`.', prng ) );
+		throw new TypeError( format( 'null3c', prng ) );
 	}
 	if ( !isCollection( idtypes ) ) {
-		throw new TypeError( format( 'invalid argument. Second argument must be an array-like object. Value: `%s`.', idtypes ) );
+		throw new TypeError( format( 'null2y', idtypes ) );
 	}
 	idtypes = copy( idtypes );
 	for ( i = 0; i < idtypes.length; i++ ) {
@@ -326,7 +326,7 @@ function Random( prng, idtypes, odtypes, policies, options ) {
 	odtypes = dtypes2strings( odtypes );
 
 	if ( !isObject( policies ) ) {
-		throw new TypeError( format( 'invalid argument. Fourth argument must be an object. Value: `%s`.', policies ) );
+		throw new TypeError( format( 'null43', policies ) );
 	}
 	if ( !isOutputDataTypePolicy( policies.output ) ) {
 		throw new TypeError( format( 'invalid argument. Fourth argument must be an object having a supported output data type policy. Value: `%s`.', policies.output ) );
@@ -336,7 +336,7 @@ function Random( prng, idtypes, odtypes, policies, options ) {
 	};
 	if ( arguments.length > 4 ) {
 		if ( !isPlainObject( options ) ) {
-			throw new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
+			throw new TypeError( format( 'null2V', options ) );
 		}
 		if ( hasOwnProp( options, 'order' ) ) {
 			opts.order = options.order;
@@ -414,7 +414,7 @@ setReadOnly( Random.prototype, 'generate', function generate( shape, param1, par
 	var i;
 
 	if ( !isNonNegativeIntegerArray( shape ) && !isEmptyCollection( shape ) ) {
-		throw new TypeError( format( 'invalid argument. First argument must be an array-like object containing nonnegative integers. Value: `%s`.', shape ) );
+		throw new TypeError( format( 'null5o', shape ) );
 	}
 	opts = {};
 	if ( arguments.length > 3 ) {
@@ -557,7 +557,7 @@ setReadOnly( Random.prototype, 'assign', function assign( param1, param2, out )
 		throw new TypeError( format( 'invalid argument. Third argument must be an ndarray-like object. Value: `%s`.', out ) );
 	}
 	if ( isReadOnly( out ) ) {
-		throw new Error( 'invalid argument. The output ndarray must be writable. Cannot write to a read-only ndarray.' );
+		throw new Error( format('null1g') );
 	}
 	sh = getShape( out );
 	ord = getOrder( out );
diff --git a/lib/validate.js b/lib/validate.js
index 6ed34d2..27724b9 100644
--- a/lib/validate.js
+++ b/lib/validate.js
@@ -25,7 +25,7 @@ var hasOwnProp = require( '@stdlib/assert-has-own-property' );
 var contains = require( '@stdlib/array-base-assert-contains' );
 var join = require( '@stdlib/array-base-join' );
 var resolveStr = require( '@stdlib/ndarray-base-dtype-resolve-str' );
-var format = require( '@stdlib/string-format' );
+var format = require( '@stdlib/error-tools-fmtprodmsg' );
 
 
 // MAIN //
@@ -58,12 +58,12 @@ var format = require( '@stdlib/string-format' );
 */
 function validate( opts, dtypes, options ) {
 	if ( !isObject( options ) ) {
-		return new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
+		return new TypeError( format( 'null2V', options ) );
 	}
 	if ( hasOwnProp( options, 'dtype' ) ) {
 		opts.dtype = resolveStr( options.dtype );
 		if ( !contains( dtypes, opts.dtype ) ) {
-			return new TypeError( format( 'invalid option. `%s` option must be one of the following: "%s". Option: `%s`.', 'dtype', join( dtypes, '", "' ), options.dtype ) );
+			return new TypeError( format( 'null4S', 'dtype', join( dtypes, '", "' ), options.dtype ) );
 		}
 	}
 	// Pass-through options...
diff --git a/package.json b/package.json
index 02f652f..15dc42d 100644
--- a/package.json
+++ b/package.json
@@ -76,7 +76,7 @@
     "@stdlib/ndarray-order": "^0.2.3",
     "@stdlib/ndarray-shape": "^0.2.3",
     "@stdlib/strided-base-nullary": "^0.3.1",
-    "@stdlib/string-format": "^0.2.3",
+    "@stdlib/error-tools-fmtprodmsg": "^0.2.3",
     "@stdlib/types": "^0.5.1",
     "@stdlib/utils-define-nonenumerable-read-only-property": "^0.2.3",
     "@stdlib/error-tools-fmtprodmsg": "^0.2.3"