diff --git a/apps/checker/app/matchers/LanguageToolMatcher.scala b/apps/checker/app/matchers/LanguageToolMatcher.scala
index 607956a7a..685790ff8 100644
--- a/apps/checker/app/matchers/LanguageToolMatcher.scala
+++ b/apps/checker/app/matchers/LanguageToolMatcher.scala
@@ -1,8 +1,10 @@
 package matchers
 
 import com.gu.typerighter.model.{Category, LTRule, LTRuleXML, RuleMatch}
+
 import java.io.File
 import org.languagetool._
+import org.languagetool.language.{BritishEnglish}
 import org.languagetool.rules.spelling.morfologik.suggestions_ordering.SuggestionsOrdererConfig
 import org.languagetool.rules.{Rule => LanguageToolRule}
 import play.api.Logging
@@ -13,7 +15,8 @@ import scala.concurrent.{ExecutionContext, Future}
 import org.languagetool.rules.patterns.PatternRuleLoader
 import org.languagetool.rules.patterns.AbstractPatternRule
 import utils.{Matcher, MatcherCompanion}
-import scala.xml.{XML, Attribute, Null, Text}
+
+import scala.xml.{Attribute, Null, Text, XML}
 import scala.util.Try
 import scala.util.Success
 import scala.util.Failure
@@ -111,7 +114,12 @@ class LanguageToolFactory(
         val loader = new PatternRuleLoader()
         getXMLStreamFromLTRules(rules) flatMap { xmlStream =>
           {
-            Try(loader.getRules(xmlStream, "languagetool-generated-xml").asScala.toList)
+            Try(
+              loader
+                .getRules(xmlStream, "languagetool-generated-xml", new BritishEnglish())
+                .asScala
+                .toList
+            )
           }
         }
       }
diff --git a/apps/checker/test/scala/matchers/LanguageToolMatcherTest.scala b/apps/checker/test/scala/matchers/LanguageToolMatcherTest.scala
index 028d683af..8741cb366 100644
--- a/apps/checker/test/scala/matchers/LanguageToolMatcherTest.scala
+++ b/apps/checker/test/scala/matchers/LanguageToolMatcherTest.scala
@@ -218,7 +218,7 @@ class LanguageToolMatcherTest extends AsyncFlatSpec with Matchers {
     val eventuallyMatches = instance.check(request)
 
     val expectedMatchMessages =
-      List("Did you mean <suggestion>fewer</suggestion>? The noun tests is countable.")
+      List("Did you mean <suggestion>fewer</suggestion>? The noun \"tests\" is countable.")
     val expectedMatchCategoryIds = List("GRAMMAR")
     eventuallyMatches map { matches =>
       matches.map(_.message) shouldBe expectedMatchMessages
diff --git a/build.sbt b/build.sbt
index 01f949e54..9786e549c 100644
--- a/build.sbt
+++ b/build.sbt
@@ -24,7 +24,7 @@ ThisBuild / scalacOptions := Seq(
 // See https://support.snyk.io/hc/en-us/articles/9590215676189-Deeply-nested-Scala-projects-have-dependencies-truncated
 ThisBuild / asciiGraphWidth := 999999999
 
-val languageToolVersion = "6.0"
+val languageToolVersion = "6.4"
 val awsSdkVersion = "1.12.749"
 val capiModelsVersion = "17.5.1"
 val capiClientVersion = "19.2.1"