diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index cadbdd3..b0981cc 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -45,9 +45,9 @@ sendgrid   = { group = "com.sendgrid",          name = "sendgrid-java",  version
 ## kotlin ##
 kotlin-bom         = { group = "org.jetbrains.kotlin",   name = "kotlin-bom",                  version.ref = "kotlin" }
 
-kotlinx-serde      = { group = "org.jetbrains.kotlinx",  name = "kotlinx-serialization-json",  version     = "1.2.2"  }
-kotlinx-coroutines = { group = "org.jetbrains.kotlinx",  name = "kotlinx-coroutines-core",     version     = "1.5.2"  }
-kotlinx-html       = { group = "org.jetbrains.kotlinx",  name = "kotlinx-html",                version     = "0.7.3"  }
+kotlinx-serialization = { group = "org.jetbrains.kotlinx",  name = "kotlinx-serialization-json",  version     = "1.3.0"  }
+kotlinx-coroutines    = { group = "org.jetbrains.kotlinx",  name = "kotlinx-coroutines-core",     version     = "1.5.2"  }
+kotlinx-html          = { group = "org.jetbrains.kotlinx",  name = "kotlinx-html",                version     = "0.7.3"  }
 
 ## http4k ##
 http4k-bom         = { group = "org.http4k",  name = "http4k-bom",                          version.ref = "http4k" }
@@ -62,6 +62,10 @@ http4k-format-xml  = { group = "org.http4k",  name = "http4k-format-jackson-xml"
 http4k-format-yaml = { group = "org.http4k",  name = "http4k-format-jackson-yaml"           }
 http4k-graphql     = { group = "org.http4k",  name = "http4k-graphql"                       }
 
+### jackson ##
+#jackson-bom     = { group = " com.fasterxml.jackson.module",  name = ":jackson-module-kotlin", version = "2.13.+"                       }
+#jackson-kotlin     = { group = " com.fasterxml.jackson.module",  name = ":jackson-module-kotlin", version = "2.13.+"                       }
+
 ## logging ##
 slf4j-api       = { group = "org.slf4j",             name = "slf4j-api",                 version.ref = "slf4j"      }
 kotlin-logging  = { group = "io.github.microutils",  name = "kotlin-logging-jvm",        version     = "2.0.11"     }