diff --git a/dev/tests/spec/lexer.spec.js b/dev/tests/spec/lexer.spec.js
index 33b12f7..eae0e2d 100644
--- a/dev/tests/spec/lexer.spec.js
+++ b/dev/tests/spec/lexer.spec.js
@@ -1,5 +1,5 @@
 //for node
-var crossroads = crossroads || require('../../../dist/crossroads');
+let crossroads = crossroads || require('../../../dist/crossroads');
 //end node
 
 
@@ -9,7 +9,7 @@ describe('patternLexer', function(){
     describe('getParamIds()', function(){
 
         it('should return an Array with the ids', function(){
-            var ids = crossroads.patternLexer.getParamIds('/lorem/{ipsum}/{dolor}');
+            let ids = crossroads.patternLexer.getParamIds('/lorem/{ipsum}/{dolor}');
             expect( ids[0] ).toEqual( 'ipsum' );
             expect( ids[1] ).toEqual( 'dolor' );
         });
@@ -21,25 +21,25 @@ describe('patternLexer', function(){
     describe('compilePattern()', function(){
 
         it('should create RegExp from string which should match pattern', function(){
-            var pattern = '/lorem/{ipsum}/{dolor}',
+            let pattern = '/lorem/{ipsum}/{dolor}',
                 regex = crossroads.patternLexer.compilePattern(pattern);
             expect( regex.test(pattern) ).toEqual( true );
         });
 
         it('should work with special chars', function(){
-            var pattern = '/lo[rem](ipsum)/{ipsum}/{dolor}',
+            let pattern = '/lo[rem](ipsum)/{ipsum}/{dolor}',
                 regex = crossroads.patternLexer.compilePattern(pattern); 
             expect( regex.test(pattern) ).toEqual( true );
         });
 
         it('should work with optional params', function(){
-            var pattern = '/lo[rem](ipsum)/{ipsum}/{dolor}:foo::bar:/:blah:/maecennas',
+            let pattern = '/lo[rem](ipsum)/{ipsum}/{dolor}:foo::bar:/:blah:/maecennas',
                 regex = crossroads.patternLexer.compilePattern(pattern); 
             expect( regex.test(pattern) ).toEqual( true );
         });
 
         it('should support rest params', function(){
-            var pattern = '/lo[rem](ipsum)/{ipsum*}/{dolor}:foo::bar*:/:blah:/maecennas',
+            let pattern = '/lo[rem](ipsum)/{ipsum*}/{dolor}:foo::bar*:/:blah:/maecennas',
                 regex = crossroads.patternLexer.compilePattern(pattern); 
             expect( regex.test(pattern) ).toEqual( true );
         });
@@ -50,7 +50,7 @@ describe('patternLexer', function(){
     describe('getParamValues()', function(){
 
         it('should return pattern params', function(){
-            var pattern = '/lorem/{ipsum}/{dolor}',
+            let pattern = '/lorem/{ipsum}/{dolor}',
                 regex = crossroads.patternLexer.compilePattern(pattern),
                 params = crossroads.patternLexer.getParamValues('/lorem/foo/bar', regex);