diff --git a/build.sbt b/build.sbt
index 05a8389..73def83 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 ca8487b..b1394d1 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"      % "2.0.19" % "test"
diff --git a/zio-quickstart-graphql-webservice/build.sbt b/zio-quickstart-graphql-webservice/build.sbt
index 5803aa9..42747e5 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 8defc8c..e0546a1 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 56dde80..3822a40 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 373622e..c9babad 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 5d596f8..c7b4dae 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"                 % "2.0.19",
diff --git a/zio-quickstart-restful-webservice-custom-logger/build.sbt b/zio-quickstart-restful-webservice-custom-logger/build.sbt
index 4699e77..873fc6e 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"               % "2.0.19",
diff --git a/zio-quickstart-restful-webservice-dockerize/build.sbt b/zio-quickstart-restful-webservice-dockerize/build.sbt
index ed2df20..cf25142 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"            % "2.0.19",
diff --git a/zio-quickstart-restful-webservice-logging/build.sbt b/zio-quickstart-restful-webservice-logging/build.sbt
index e29d9b0..8b141cf 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"            % "2.0.19",
diff --git a/zio-quickstart-restful-webservice-metrics/build.sbt b/zio-quickstart-restful-webservice-metrics/build.sbt
index decc9f3..3a58bed 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 fe41321..c1fc21f 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(