diff --git a/.circleci/config.yml b/.circleci/config.yml
index f118fc2b53..9547b6e9b2 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -9,6 +9,8 @@ jobs:
       # documented at https://circleci.com/docs/2.0/circleci-images/
       - image: circleci/openjdk:11-jdk-node-browsers
 
+    resource_class: medium+
+
     working_directory: ~/repo
 
     environment:
diff --git a/buildSrc/src/main/kotlin/Versions.kt b/buildSrc/src/main/kotlin/Versions.kt
index ddd6420d3b..fa7ff397f2 100644
--- a/buildSrc/src/main/kotlin/Versions.kt
+++ b/buildSrc/src/main/kotlin/Versions.kt
@@ -1,5 +1,5 @@
 object Versions {
-    const val kotlin = "1.7.20"
+    const val kotlin = "1.7.21"
     const val kotlinGradlePlugin = kotlin
     const val coroutines = "1.6.4"
     const val serializationRuntime = "1.4.0"
@@ -26,4 +26,4 @@ object Versions {
     const val atrium = "0.16.0"
     const val atriumApi = "atrium-fluent-en_GB"
     const val coroutinesTest = coroutines
-}
\ No newline at end of file
+}