diff --git a/build.sbt b/build.sbt
index f13e72a12..3937ea625 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,6 +1,6 @@
 lazy val commonSettings = Seq(
   version := "1.0.0-beta85",
-  scalaVersion := "2.13.3"
+  scalaVersion := "2.13.6"
 )
 
 val scalaTest = "org.scalatest" %% "scalatest" % "3.2.0" % Test
@@ -8,7 +8,7 @@ val sprayJson = "io.spray" %% "spray-json" % "1.3.6"
 val snakeYaml = "org.yaml" % "snakeyaml" % "1.26"
 val scaffeine = "com.github.blemale" %% "scaffeine" % "4.0.2"
 val directories = "io.github.soc" % "directories" % "12"
-val fastparse = "com.lihaoyi" %% "fastparse" % "2.2.2"
+val fastparse = "com.lihaoyi" %% "fastparse" % "2.3.1"
 
 intellijPluginName in ThisBuild := "IntelliJ-Haskell"
 
diff --git a/project/build.properties b/project/build.properties
index c06db1bb2..67d27a1df 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.4.5
+sbt.version=1.5.3
diff --git a/project/plugins.sbt b/project/plugins.sbt
index d2a9c2f26..382b4e0a4 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1,4 +1,4 @@
-addSbtPlugin("org.jetbrains" % "sbt-idea-plugin" % "3.8.3")
+addSbtPlugin("org.jetbrains" % "sbt-idea-plugin" % "3.12.5")
 
 resolvers += Resolver.url("jetbrains-bintray",
   url("https://dl.bintray.com/jetbrains/sbt-plugins/"))(Resolver.ivyStylePatterns)
diff --git a/src/main/scala/intellij/haskell/refactor/HaskellNamesValidator.scala b/src/main/scala/intellij/haskell/refactor/HaskellNamesValidator.scala
index 7f8565a53..4dfba8c18 100644
--- a/src/main/scala/intellij/haskell/refactor/HaskellNamesValidator.scala
+++ b/src/main/scala/intellij/haskell/refactor/HaskellNamesValidator.scala
@@ -24,7 +24,7 @@ class HaskellNamesValidator extends NamesValidator {
 
   override def isKeyword(name: String, project: Project): Boolean = {
     val lexer = new HaskellLexer
-    lexer.start(name.toCharArray)
+    lexer.start(name)
     HaskellParserDefinition.ReservedIdS.contains(lexer.getTokenType) ||
         HaskellParserDefinition.ReservedOperators.contains(lexer.getTokenType) ||
         HaskellParserDefinition.SymbolsResOp.contains(lexer.getTokenType)