diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 89263ef..f8e9803 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,10 +10,13 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up JDK 11
-      uses: actions/setup-java@v1
+    - uses: actions/checkout@v4
+    - name: Set up JDK 21
+      uses: actions/setup-java@v4
       with:
-        java-version: 11
+        distribution: temurin
+        java-version: 21
+    - name: Setup sbt launcher
+      uses: sbt/setup-sbt@v1
     - name: Run tests
       run: sbt test
diff --git a/build.sbt b/build.sbt
index 22a7ea6..6890f02 100644
--- a/build.sbt
+++ b/build.sbt
@@ -3,20 +3,20 @@ organization := "com.signalpath"
 version := "1.2"
 
 lazy val versions = new {
-  val scala212 = "2.12.11"
-  val scala213 = "2.13.10"
+  val scala212 = "2.12.20"
+  val scala213 = "2.13.15"
   val supportedScalaVersions = List(scala212, scala213)
 }
 
 crossScalaVersions := versions.supportedScalaVersions
 
 libraryDependencies ++= Seq(
-  "co.fs2" %% "fs2-core" % "2.5.6",
-  "com.github.alonsodomin.cron4s" %% "cron4s-core" % "0.6.1",
-  "eu.timepit" %% "fs2-cron-cron4s" % "0.5.0",
-  "org.typelevel" %% "cats-core" % "2.6.1",
-  "org.scalatest" %% "scalatest" % "3.1.2" % Test,
-  "org.scalamock" %% "scalamock" % "5.2.0" % Test,
+  "co.fs2" %% "fs2-core" % "2.5.10",
+  "com.github.alonsodomin.cron4s" %% "cron4s-core" % "0.6.1", // tied to fs2-cron-cron4s below
+  "eu.timepit" %% "fs2-cron-cron4s" % "0.5.0", // code needs to be reworked if we want to up these
+  "org.typelevel" %% "cats-core" % "2.13.0",
+  "org.scalatest" %% "scalatest" % "3.2.19" % Test,
+  "org.scalamock" %% "scalamock" % "6.1.1" % Test,
 )
 
 bintrayOrganization := Some("signalpath")
diff --git a/project/build.properties b/project/build.properties
new file mode 100644
index 0000000..73df629
--- /dev/null
+++ b/project/build.properties
@@ -0,0 +1 @@
+sbt.version=1.10.7