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 9136412b..cf49975e 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"      % "2.0.18" % "test"
diff --git a/zio-quickstart-graphql-webservice/build.sbt b/zio-quickstart-graphql-webservice/build.sbt
index b6ddf970..f6f41ac0 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 31b0502d..5e489450 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 b5c988af..03b276d4 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 00fc561c..b6691364 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 df9d4831..a4988db5 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"                 % "2.0.18",
diff --git a/zio-quickstart-restful-webservice-custom-logger/build.sbt b/zio-quickstart-restful-webservice-custom-logger/build.sbt
index f48b15dc..afcf2319 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"               % "2.0.18",
diff --git a/zio-quickstart-restful-webservice-dockerize/build.sbt b/zio-quickstart-restful-webservice-dockerize/build.sbt
index 61a2afb4..99bd507d 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"            % "2.0.18",
diff --git a/zio-quickstart-restful-webservice-logging/build.sbt b/zio-quickstart-restful-webservice-logging/build.sbt
index e7852972..659cafea 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"            % "2.0.18",
diff --git a/zio-quickstart-restful-webservice-metrics/build.sbt b/zio-quickstart-restful-webservice-metrics/build.sbt
index 1f653f8a..fafd2a12 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 3f254748..e63db317 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(