diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 541a99df3..5018a856b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,12 +1,13 @@
 name: CI
+
 on:
-  push:
-    branches:
-      - master
   pull_request:
-    branches:
-      - master
+  push:
+    tags-ignore:
+      - v*
+
 jobs:
+
   build:
     runs-on: ubuntu-latest
     strategy:
@@ -33,6 +34,7 @@ jobs:
         run: sbt "++${{ matrix.scalaversion }}" example/compile
       - name: scalafmt
         run: sbt "++${{ matrix.scalaversion }}" scalafmtCheck
+
   readme:
     runs-on: ubuntu-latest
     steps:
diff --git a/build.sbt b/build.sbt
index 7575d5f50..f44997487 100644
--- a/build.sbt
+++ b/build.sbt
@@ -5,11 +5,11 @@ lazy val root = project.in(file(".")).
 
 name := "Scala.js DOM"
 
-crossScalaVersions in ThisBuild := {
+ThisBuild / crossScalaVersions := {
   if (scalaJSVersion.startsWith("1.")) Seq("2.12.10", "2.11.12", "2.13.1")
   else Seq("2.12.10", "2.11.12", "2.10.7", "2.13.1")
 }
-scalaVersion in ThisBuild := crossScalaVersions.value.head
+ThisBuild / scalaVersion := crossScalaVersions.value.head
 
 val commonSettings = Seq(
   version := "1.2.0-SNAPSHOT",
@@ -114,7 +114,7 @@ lazy val readme = ScalatexReadme(
 ).settings(
   scalaVersion := "2.12.10",
   scalacOptions ++= Seq("-deprecation", "-feature", "-Xfatal-warnings"),
-  (resources in Compile) += (fullOptJS in (example, Compile)).value.data
+  (Compile / resources) += (example / Compile / fullOptJS).value.data
 )
 
 lazy val example = project.
diff --git a/project/build.properties b/project/build.properties
index c0bab0494..10fd9eee0 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.2.8
+sbt.version=1.5.5