diff --git a/package-lock.json b/package-lock.json
index a727ceb..ed9dd7c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,7 +13,7 @@
         "@minoru/react-dnd-treeview": "^3.4.1",
         "@monaco-editor/react": "^4.5.1",
         "@orbs-network/ton-access": "^2.3.0",
-        "@tact-lang/compiler": "^1.3.1",
+        "@tact-lang/compiler": "^1.4.0",
         "@ton-community/func-js": "^0.5.0",
         "@ton/core": "^0.56.3",
         "@ton/sandbox": "^0.16.0",
@@ -883,9 +883,9 @@
       }
     },
     "node_modules/@tact-lang/compiler": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/@tact-lang/compiler/-/compiler-1.3.1.tgz",
-      "integrity": "sha512-XAKgO5DMUzP1Ya6lMv5tIPYhQKYmeb26aK4TpcI4GW6dHyyV7jpmbH2DJgdwJvGCAbombmq0FGhwM3zKoTITwQ==",
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/@tact-lang/compiler/-/compiler-1.4.0.tgz",
+      "integrity": "sha512-MUZ8ulTrIs0sgs1tdNww7yan6ozMGNO7xR6S0yKZc57E0EN9o72vRqKdQW7k3iS3+MvltKPt6RVbNamtuVJ1tQ==",
       "dependencies": {
         "@ipld/dag-pb": "2.1.18",
         "@tact-lang/opcode": "^0.0.14",
@@ -9247,9 +9247,9 @@
       }
     },
     "@tact-lang/compiler": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/@tact-lang/compiler/-/compiler-1.3.1.tgz",
-      "integrity": "sha512-XAKgO5DMUzP1Ya6lMv5tIPYhQKYmeb26aK4TpcI4GW6dHyyV7jpmbH2DJgdwJvGCAbombmq0FGhwM3zKoTITwQ==",
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/@tact-lang/compiler/-/compiler-1.4.0.tgz",
+      "integrity": "sha512-MUZ8ulTrIs0sgs1tdNww7yan6ozMGNO7xR6S0yKZc57E0EN9o72vRqKdQW7k3iS3+MvltKPt6RVbNamtuVJ1tQ==",
       "requires": {
         "@ipld/dag-pb": "2.1.18",
         "@tact-lang/opcode": "^0.0.14",
diff --git a/package.json b/package.json
index 2b7a1b1..9f8d6b9 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     "@minoru/react-dnd-treeview": "^3.4.1",
     "@monaco-editor/react": "^4.5.1",
     "@orbs-network/ton-access": "^2.3.0",
-    "@tact-lang/compiler": "^1.3.1",
+    "@tact-lang/compiler": "^1.4.0",
     "@ton-community/func-js": "^0.5.0",
     "@ton/core": "^0.56.3",
     "@ton/sandbox": "^0.16.0",
diff --git a/src/assets/ton/tact/tmLanguage.json b/src/assets/ton/tact/tmLanguage.json
index 86545a4..5ef32bc 100644
--- a/src/assets/ton/tact/tmLanguage.json
+++ b/src/assets/ton/tact/tmLanguage.json
@@ -16,11 +16,14 @@
       "include": "#literal"
     },
     {
-      "include": "#type"
+      "include": "#invalid"
     },
     {
       "include": "#constant"
     },
+    {
+      "include": "#type"
+    },
     {
       "include": "#expression"
     },
@@ -60,7 +63,7 @@
           "begin": "\\s*/\\*",
           "beginCaptures": {
             "0": {
-              "name": "comment.block.begin.tact"
+              "name": "comment.block.begin.tact punctuation.definition.comment.begin.tact"
             }
           },
           "patterns": [
@@ -71,7 +74,7 @@
           "end": "\\*/",
           "endCaptures": {
             "0": {
-              "name": "comment.block.end.tact"
+              "name": "comment.block.end.tact punctuation.definition.comment.end.tact"
             }
           }
         }
@@ -176,7 +179,7 @@
         {
           "comment": "self",
           "match": "(?<!\\.)\\b(self)\\b",
-          "name": "variable.language.self.tact"
+          "name": "variable.language.this.tact"
         }
       ]
     },
@@ -185,7 +188,7 @@
       "begin": "\"",
       "beginCaptures": {
         "0": {
-          "name": "punctuation.definition.string.tact"
+          "name": "punctuation.definition.string.begin.tact"
         }
       },
       "name": "string.quoted.double.tact",
@@ -197,32 +200,80 @@
       "end": "\"",
       "endCaptures": {
         "0": {
-          "name": "punctuation.definition.string.tact"
+          "name": "punctuation.definition.string.end.tact"
         }
       }
     },
     "escape-sequence": {
       "comment": "Allowed escape sequences in strings",
-      "match": "(\\\\)(([\\\\\"nrtvbf])|(x[a-fA-F0-9]{2})|(u[a-fA-F0-9]{4})|(u\\{[a-fA-F0-9]{1,6}\\}))",
+      "match": "(?:\\\\)(?:(\\\\)|(\")|([nrtvbf])|(x[a-fA-F0-9]{2})|(u[a-fA-F0-9]{4})|(u\\{[a-fA-F0-9]{1,6}\\}))",
       "name": "constant.character.escape.tact",
       "captures": {
         "1": {
           "name": "constant.character.escape.backslash.tact"
         },
         "2": {
-          "name": "constant.character.escape.special.tact"
+          "name": "constant.character.escape.double-quote.tact"
         },
         "3": {
-          "name": "constant.character.escape.hex.tact"
+          "name": "constant.character.escape.special.tact"
         },
         "4": {
-          "name": "constant.character.escape.unicode.tact"
+          "name": "constant.character.escape.hex.tact"
         },
         "5": {
+          "name": "constant.character.escape.unicode.tact"
+        },
+        "6": {
           "name": "constant.character.escape.unicodepoint.tact"
         }
       }
     },
+    "invalid": {
+      "patterns": [
+        {
+          "comment": "Anything starting with __gen or __tact",
+          "match": "\\b__(?:gen|tact)[a-zA-Z0-9_]*\\b",
+          "name": "invalid.illegal.identifier.tact"
+        }
+      ]
+    },
+    "constant": {
+      "patterns": [
+        {
+          "comment": "self.storageReserve",
+          "match": "(?<=self\\.)(storageReserve)\\b",
+          "name": "constant.other.builtin.tact"
+        },
+        {
+          "comment": "Other constants from the core library",
+          "match": "(?<!\\.)\\b(SendRemainingValue|SendRemainingBalance|SendPayGasSeparately|SendIgnoreErrors|SendBounceIfActionFail|SendDestroyIfZero|ReserveExact|ReserveAllExcept|ReserveAtMost|ReserveAddOriginalBalance|ReserveInvertSign|ReserveBounceIfActionFail)\\b",
+          "name": "constant.other.builtin.tact"
+        },
+        {
+          "comment": "ALL CAPS constants",
+          "match": "\\b([A-Z]{2}[A-Z0-9_]*)\\b",
+          "name": "constant.other.caps.tact"
+        },
+        {
+          "comment": "Constant declaration or definition",
+          "match": "(?<!\\.)\\b(const)\\s+([a-zA-Z_][A-Za-z0-9_]*)\\b",
+          "captures": {
+            "1": {
+              "name": "keyword.other.tact"
+            },
+            "2": {
+              "name": "constant.other.declaration.tact"
+            }
+          }
+        },
+        {
+          "comment": "null",
+          "match": "(?<!\\.)\\b(null)\\b",
+          "name": "constant.language.null.tact"
+        }
+      ]
+    },
     "type": {
       "patterns": [
         {
@@ -299,13 +350,13 @@
       }
     },
     "as-tlb": {
-      "comment": "Storage modifiers",
+      "comment": "Serialization",
       "patterns": [
         {
           "match": "(?<!\\.)\\b(as)\\s+([a-zA-Z_][a-zA-Z0-9_]*)\\b",
           "captures": {
             "1": {
-              "name": "storage.modifier.tact"
+              "name": "keyword.other.as.tact storage.modifier.tact"
             },
             "2": {
               "name": "entity.name.type.tact"
@@ -314,32 +365,6 @@
         }
       ]
     },
-    "constant": {
-      "patterns": [
-        {
-          "comment": "ALL CAPS constants",
-          "match": "\\b([A-Z]{2}[A-Z0-9_]*)\\b",
-          "name": "constant.other.caps.tact"
-        },
-        {
-          "comment": "Constant declaration or definition",
-          "match": "^\\s*(const)\\s+([A-Z][A-Za-z0-9_]*)\\b",
-          "captures": {
-            "1": {
-              "name": "storage.type.tact"
-            },
-            "2": {
-              "name": "constant.other.caps.tact"
-            }
-          }
-        },
-        {
-          "comment": "null",
-          "match": "(?<!\\.)\\b(null)\\b",
-          "name": "constant.language.null.tact"
-        }
-      ]
-    },
     "expression": {
       "patterns": [
         {
@@ -433,9 +458,14 @@
           "match": "(?<!\\.)\\b(import)\\b",
           "name": "keyword.control.import.tact"
         },
+        {
+          "comment": "Control flow keywords, prefixed by more than one dot",
+          "match": "(?<=\\.\\.)\\b(else|catch|until|in(?!\\s*\\())\\b",
+          "name": "keyword.control.tact"
+        },
         {
           "comment": "Control flow keywords",
-          "match": "(?<!\\.)\\b(if|else|try|catch|repeat|do|until|while|foreach|in|return)\\b",
+          "match": "(?<!\\.)\\b(if|else|try|catch|repeat|do|until|while|foreach|in(?!\\s*\\()|return)\\b",
           "name": "keyword.control.tact"
         },
         {
@@ -446,7 +476,7 @@
         {
           "comment": "Serialization",
           "match": "(?<!\\.)\\b(as)\\b",
-          "name": "keyword.other.as.tact"
+          "name": "keyword.other.as.tact storage.modifier.tact"
         },
         {
           "match": "(?<!\\.)\\b(struct)\\b",
@@ -476,7 +506,12 @@
         },
         {
           "comment": "Function declaration/definition keywords",
-          "match": "(?<!\\.)\\b(fun|native|init|receive|bounced|external)\\b",
+          "match": "(?<!\\.)\\b(fun|native)\\b",
+          "name": "keyword.other.function.tact"
+        },
+        {
+          "comment": "Special functions",
+          "match": "(?<!\\.)\\b(init|receive|bounced|external)(?=\\s*\\()",
           "name": "keyword.other.function.tact"
         },
         {
@@ -493,17 +528,29 @@
     },
     "function": {
       "comment": "Function declaration, definition or call",
-      "match": "\\b((?:[a-zA-Z_][a-zA-Z0-9_]*))\\s*\\(",
+      "match": "\\b((?:[a-zA-Z_][a-zA-Z0-9_]*))\\s*(\\()",
       "captures": {
         "1": {
           "name": "entity.name.function.tact"
+        },
+        "2": {
+          "name": "punctuation.brackets.round.tact"
         }
       }
     },
     "variable": {
-      "comment": "Any valid Tact identifier",
-      "match": "\\b([a-zA-Z_][a-zA-Z0-9_]*)\\b",
-      "name": "variable.other.tact"
+      "patterns": [
+        {
+          "comment": "Any valid Tact identifier",
+          "match": "(?<!\\.)\\b(_)\\b",
+          "name": "comment.unused-identifier.tact"
+        },
+        {
+          "comment": "Any valid Tact identifier",
+          "match": "\\b([a-zA-Z_][a-zA-Z0-9_]*)\\b",
+          "name": "variable.other.tact"
+        }
+      ]
     }
   }
 }