diff --git a/build.sbt b/build.sbt
index e9c82bca..f62031f7 100644
--- a/build.sbt
+++ b/build.sbt
@@ -8,7 +8,7 @@ inThisBuild(
     ciReleaseJobs              := Seq.empty,
     ciPostReleaseJobs          := Seq.empty,
     ciCheckWebsiteBuildProcess := Seq.empty,
-    scalaVersion               := "2.13.8",
+    scalaVersion               := "2.13.12",
     ciTargetScalaVersions := makeTargetScalaMap(
       `zio-quickstart-encode-decode-json`
     ).value,
diff --git a/zio-quickstart-encode-decode-json/build.sbt b/zio-quickstart-encode-decode-json/build.sbt
index 65894f1f..54272667 100644
--- a/zio-quickstart-encode-decode-json/build.sbt
+++ b/zio-quickstart-encode-decode-json/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.8"
+scalaVersion := "2.13.12"
 Test / fork  := true
 
 libraryDependencies += "dev.zio" %% "zio"      % "2.0.17" % "test"
diff --git a/zio-quickstart-graphql-webservice/build.sbt b/zio-quickstart-graphql-webservice/build.sbt
index daefcc1c..1aa62f61 100644
--- a/zio-quickstart-graphql-webservice/build.sbt
+++ b/zio-quickstart-graphql-webservice/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.8"
+scalaVersion := "2.13.12"
 organization := "dev.zio"
 name         := "zio-quickstart-graphql-webservice"
 
diff --git a/zio-quickstart-hello-world/build.sbt b/zio-quickstart-hello-world/build.sbt
index 0a7bbfc9..25598fde 100644
--- a/zio-quickstart-hello-world/build.sbt
+++ b/zio-quickstart-hello-world/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.8"
+scalaVersion := "2.13.12"
 organization := "dev.zio"
 
 libraryDependencies ++= Seq(
diff --git a/zio-quickstart-junit-integration/build.sbt b/zio-quickstart-junit-integration/build.sbt
index 46031f73..218e4984 100644
--- a/zio-quickstart-junit-integration/build.sbt
+++ b/zio-quickstart-junit-integration/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.8"
+scalaVersion := "2.13.12"
 organization := "dev.zio"
 
 libraryDependencies ++= Seq(
diff --git a/zio-quickstart-reloadable-services/build.sbt b/zio-quickstart-reloadable-services/build.sbt
index efb702e1..ff2d2a62 100644
--- a/zio-quickstart-reloadable-services/build.sbt
+++ b/zio-quickstart-reloadable-services/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.8"
+scalaVersion := "2.13.12"
 organization := "dev.zio"
 
 libraryDependencies ++= Seq(
diff --git a/zio-quickstart-restful-webservice-configurable-app/build.sbt b/zio-quickstart-restful-webservice-configurable-app/build.sbt
index b95d7c4e..c6d345e3 100644
--- a/zio-quickstart-restful-webservice-configurable-app/build.sbt
+++ b/zio-quickstart-restful-webservice-configurable-app/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.8"
+scalaVersion := "2.13.12"
 
 libraryDependencies ++= Seq(
   "dev.zio"       %% "zio"                 % "2.0.17",
diff --git a/zio-quickstart-restful-webservice-custom-logger/build.sbt b/zio-quickstart-restful-webservice-custom-logger/build.sbt
index a1547d7d..69946c48 100644
--- a/zio-quickstart-restful-webservice-custom-logger/build.sbt
+++ b/zio-quickstart-restful-webservice-custom-logger/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.8"
+scalaVersion := "2.13.12"
 
 libraryDependencies ++= Seq(
   "dev.zio"       %% "zio"               % "2.0.17",
diff --git a/zio-quickstart-restful-webservice-dockerize/build.sbt b/zio-quickstart-restful-webservice-dockerize/build.sbt
index 1bed13b8..0df7dc30 100644
--- a/zio-quickstart-restful-webservice-dockerize/build.sbt
+++ b/zio-quickstart-restful-webservice-dockerize/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.8"
+scalaVersion := "2.13.12"
 
 libraryDependencies ++= Seq(
   "dev.zio"       %% "zio"            % "2.0.17",
diff --git a/zio-quickstart-restful-webservice-logging/build.sbt b/zio-quickstart-restful-webservice-logging/build.sbt
index 544d0bf8..540b372c 100644
--- a/zio-quickstart-restful-webservice-logging/build.sbt
+++ b/zio-quickstart-restful-webservice-logging/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.8"
+scalaVersion := "2.13.12"
 
 libraryDependencies ++= Seq(
   "dev.zio"       %% "zio"            % "2.0.17",
diff --git a/zio-quickstart-restful-webservice-metrics/build.sbt b/zio-quickstart-restful-webservice-metrics/build.sbt
index 62be5e38..b163f893 100644
--- a/zio-quickstart-restful-webservice-metrics/build.sbt
+++ b/zio-quickstart-restful-webservice-metrics/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.8"
+scalaVersion := "2.13.12"
 organization := "dev.zio"
 name         := "zio-quickstart-restful-webservice"
 
diff --git a/zio-quickstart-streams/build.sbt b/zio-quickstart-streams/build.sbt
index 62ab1ac5..53d635c3 100644
--- a/zio-quickstart-streams/build.sbt
+++ b/zio-quickstart-streams/build.sbt
@@ -1,4 +1,4 @@
-scalaVersion := "2.13.8"
+scalaVersion := "2.13.12"
 organization := "dev.zio"
 
 libraryDependencies ++= Seq(