diff --git a/CHANGELOG.md b/CHANGELOG.md
index 54a30a59d..a8649f8ae 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,8 @@ Improved parsing for Scheme symbols containing `=`, and punctuation of
 
 Improved parsing of `=` and `&` in Clojure.
 
+Improved parsing of `:`, `,`, and constants in JSON.
+
 Improved parsing of string literals in all languages, supporting
 escaped delimiters such as `"\""` and removing incorrect support for
 single-quoted strings in JSON.
diff --git a/config/syntax.toml b/config/syntax.toml
index 1b70bcaaa..dcd77273f 100644
--- a/config/syntax.toml
+++ b/config/syntax.toml
@@ -15,6 +15,8 @@ string_patterns = [
   '"((\\")|[^"])*"',
   # Single quoted strings
   "'((\\\\')|[^'])*'",
+  # Backtick strings
+  '`((\\`)|[^`])*1`',
 ]
 comment_patterns = [
   # Single line comments
@@ -30,6 +32,10 @@ extensions = ["json"]
 atom_patterns = [
   # Numbers
   '[0-9]+',
+  # Booleans
+  '(true)|(false)|(null)',
+  # Punctuation
+  "[:,]",
 ]
 string_patterns = [
   # Double-quoted strings