diff --git a/csslint.js b/csslint-new.js
index 374adc9..c3632a9 100755
--- a/csslint.js
+++ b/csslint-new.js
@@ -3543,11 +3543,13 @@ var Properties = module.exports = {
     "grid-column"                   : 1,
     "grid-columns"                  : 1,
     "grid-column-align"             : "start | end | center | stretch",
+    "grid-column-gap"				: "inherit | initial | unset",
     "grid-column-sizing"            : 1,
     "grid-column-start"             : 1,
     "grid-column-end"               : 1,
     "grid-column-span"              : "<integer>",
     "grid-flow"                     : "none | rows | columns",
+    "grid-gap"						: "inherit | initial | unset",
     "grid-layer"                    : "<integer>",
     "grid-row"                      : 1,
     "grid-rows"                     : 1,
@@ -3555,6 +3557,7 @@ var Properties = module.exports = {
     "grid-row-start"                : 1,
     "grid-row-end"                  : 1,
     "grid-row-span"                 : "<integer>",
+    "grid-row-gap"				    : "inherit | initial | unset",
     "grid-row-sizing"               : 1,
     "grid-template"                 : 1,
     "grid-template-areas"           : 1,
@@ -3581,6 +3584,7 @@ var Properties = module.exports = {
 
     //J
     "justify-content"               : "flex-start | flex-end | center | space-between | space-around",
+    "justify-items"                 : "flex-start | flex-end | center | space-between | space-around",
     "-webkit-justify-content"       : "flex-start | flex-end | center | space-between | space-around",
 
     //K
@@ -3669,6 +3673,7 @@ var Properties = module.exports = {
     "phonemes"                      : 1,
     "pitch"                         : 1,
     "pitch-range"                   : 1,
+    "place-self"					: "inherit | initial | unset | auto | center | normal | start | end | self-start | self-end | flex-start | flex-end | left | right | baseline | first | last | stretch",
     "play-during"                   : 1,
     "pointer-events"                : "auto | none | visiblePainted | visibleFill | visibleStroke | visible | painted | fill | stroke | all",
     "position"                      : "static | relative | absolute | fixed",
@@ -10856,4 +10861,4 @@ CSSLint.addFormatter({
 });
 
 return CSSLint;
-})();
+})();
\ No newline at end of file