diff --git a/.circleci/config.yml b/.circleci/config.yml
index 1177fd3..1dc8f75 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -119,7 +119,7 @@ jobs:
     environment:
       AKKA_VERSION: 2.5.23
       ITERATEES_VERSION: 2.6.1
-      SCALA_VERSION: 2.12.20
+      SCALA_VERSION: 2.12.21
     
     steps:
       - checkout
diff --git a/build.sbt b/build.sbt
index fe7e65c..cd31a14 100644
--- a/build.sbt
+++ b/build.sbt
@@ -2,7 +2,7 @@ import Dependencies._
 
 ThisBuild / organization := "org.reactivemongo"
 
-ThisBuild / scalaVersion := "2.12.20"
+ThisBuild / scalaVersion := "2.12.21"
 
 val scala3Lts = "3.3.7"