diff --git a/.circleci/config.yml b/.circleci/config.yml
index b095729cc..85bdc8552 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -135,8 +135,8 @@ workflows:
       - scalajs_job:
           name: sjs1.0_2.12
           scala_version: 2.12.12
-          scalajs_version: 1.3.1
+          scalajs_version: 1.4.0
       - scalajs_job:
           name: sjs1.0_2.13
           scala_version: 2.13.4
-          scalajs_version: 1.3.1
+          scalajs_version: 1.4.0
diff --git a/.travis.yml b/.travis.yml
index ba23b1d7b..9758a4bac 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,7 +12,7 @@ scala:
 
 env:
   - SCALAJS_VERSION=         ADOPTOPENJDK=8
-  - SCALAJS_VERSION=1.3.1    ADOPTOPENJDK=8
+  - SCALAJS_VERSION=1.4.0    ADOPTOPENJDK=8
   - SCALAJS_VERSION=         ADOPTOPENJDK=11
   - SCALAJS_VERSION=         ADOPTOPENJDK=15
 
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 0a92b600d..e70083e6a 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1,5 +1,5 @@
 val scalaJSVersion =
-  Option(System.getenv("SCALAJS_VERSION")).filter(_.nonEmpty).getOrElse("1.3.1")
+  Option(System.getenv("SCALAJS_VERSION")).filter(_.nonEmpty).getOrElse("1.4.0")
 
 addSbtPlugin("org.scala-lang.modules" % "sbt-scala-module" % "2.2.3")
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.0.0")