diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9a86f1a..6d7caac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ All notable changes to this project will be documented in this file. This change
 
 ## [0.5.4] - 2023-02-13
 - Fixed `ignoreUnknownKeys` behavior in nested structures ([#82][i82] and [#87][p87])
+- Updated kotlin version to `1.8.10`
 
 ## [0.5.3] - 2022-10-23
 - Fixed `strictTypes` flag to allow all number conversions and not just different precisions ([#81][i81])
diff --git a/buildSrc/src/main/kotlin/Dependencies.kt b/buildSrc/src/main/kotlin/Dependencies.kt
index 6173b55..42642c4 100644
--- a/buildSrc/src/main/kotlin/Dependencies.kt
+++ b/buildSrc/src/main/kotlin/Dependencies.kt
@@ -1,6 +1,6 @@
 object Dependencies {
     object Versions {
-        const val kotlin = "1.7.10"
+        const val kotlin = "1.8.10"
         const val serialization = "1.4.0"
         const val datetime = "0.4.0"
         const val ktlintGradle = "10.2.0"
diff --git a/serialization-msgpack-timestamp-extension/build.gradle.kts b/serialization-msgpack-timestamp-extension/build.gradle.kts
index c43bbf3..b1660d0 100644
--- a/serialization-msgpack-timestamp-extension/build.gradle.kts
+++ b/serialization-msgpack-timestamp-extension/build.gradle.kts
@@ -17,7 +17,6 @@ kotlin {
             testTask {
                 useKarma {
                     useChromeHeadless()
-                    webpackConfig.cssSupport.enabled = true
                 }
             }
         }
diff --git a/serialization-msgpack-unsigned-support/build.gradle.kts b/serialization-msgpack-unsigned-support/build.gradle.kts
index c66f1ed..2809022 100644
--- a/serialization-msgpack-unsigned-support/build.gradle.kts
+++ b/serialization-msgpack-unsigned-support/build.gradle.kts
@@ -17,7 +17,6 @@ kotlin {
             testTask {
                 useKarma {
                     useChromeHeadless()
-                    webpackConfig.cssSupport.enabled = true
                 }
             }
         }
diff --git a/serialization-msgpack/build.gradle.kts b/serialization-msgpack/build.gradle.kts
index 76b6995..ac6b5d3 100644
--- a/serialization-msgpack/build.gradle.kts
+++ b/serialization-msgpack/build.gradle.kts
@@ -17,7 +17,6 @@ kotlin {
             testTask {
                 useKarma {
                     useChromeHeadless()
-                    webpackConfig.cssSupport.enabled = true
                 }
             }
         }