diff --git a/runtime/queries/solidity/highlights.scm b/runtime/queries/solidity/highlights.scm
index fcc8d3e31..a691d0c9a 100644
--- a/runtime/queries/solidity/highlights.scm
+++ b/runtime/queries/solidity/highlights.scm
@@ -223,6 +223,16 @@
   "new"
   "++"
   "--"
+  "+="
+  "-="
+  "*="
+  "/="
+  "%="
+  "^="
+  "&="
+  "|="
+  "<<="
+  ">>="
 ] @operator
 
 [