diff --git a/.github/workflows/scala.yml b/.github/workflows/scala.yml
index 2783621..9abd3e5 100644
--- a/.github/workflows/scala.yml
+++ b/.github/workflows/scala.yml
@@ -8,7 +8,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-22.04
+    runs-on: macos-latest
     env:
       TF_CPP_MIN_LOG_LEVEL: 3
     steps:
@@ -17,8 +17,8 @@ jobs:
         uses: actions/setup-java@v1
         with:
           java-version: 1.8
-#      - name: install brew on mac
-#        run: |
-#          brew install sbt
+      - name: install brew on mac
+        run: |
+          brew install sbt
       - name: Run tests
         run: sbt test
diff --git a/build.sbt b/build.sbt
index 78c44f5..ecc7140 100644
--- a/build.sbt
+++ b/build.sbt
@@ -3,7 +3,7 @@ import com.typesafe.sbt.packager.archetypes.JavaAppPackaging
 enablePlugins(JavaServerAppPackaging)
 enablePlugins(JavaAppPackaging)
 
-val scalaTestVersion = "3.2.14"
+val scalaTestVersion = "3.2.15"
 
 name := "spark-nlp-starter"
 
@@ -22,7 +22,9 @@ ThisBuild / developers := List(
     email = "maziyar.panahi@iscpif.fr",
     url = url("https://github.com/maziyarpanahi")))
 
-val sparkVer = "3.4.1"
+// Spark NLP 5.1.0 was compiled with Scala 2.12.15 and Spark 3.3.1
+// Do not change these versions unless you know what you are doing
+val sparkVer = "3.3.1"
 val sparkNLP = "5.1.0"
 
 libraryDependencies ++= {