diff --git a/build.sbt b/build.sbt
index 7313c0d..0a2c812 100644
--- a/build.sbt
+++ b/build.sbt
@@ -21,7 +21,7 @@ testFrameworks += new TestFramework("zio.test.sbt.ZTestFramework")
 val zioVersion = "1.0.16"
 val zioConfigVersion = "1.0.10"
 val tapirVersion = "0.16.16"
-val http4sVersion = "0.21.33"
+val http4sVersion = "0.23.12"
 val circeVersion = "0.14.2"
 val logbackVersion = "1.2.11"
 
diff --git a/src/main/scala/org/renci/cam/HttpClient.scala b/src/main/scala/org/renci/cam/HttpClient.scala
index 823d5b1..1f6e48a 100644
--- a/src/main/scala/org/renci/cam/HttpClient.scala
+++ b/src/main/scala/org/renci/cam/HttpClient.scala
@@ -1,7 +1,7 @@
 package org.renci.cam
 
 import org.http4s.client.Client
-import org.http4s.client.blaze.BlazeClientBuilder
+import org.http4s.blaze.client.BlazeClientBuilder
 import zio._
 import zio.interop.catz._
 
diff --git a/src/main/scala/org/renci/cam/Server.scala b/src/main/scala/org/renci/cam/Server.scala
index 532933b..2e57c1b 100644
--- a/src/main/scala/org/renci/cam/Server.scala
+++ b/src/main/scala/org/renci/cam/Server.scala
@@ -7,7 +7,7 @@ import io.circe.yaml.syntax._
 import org.http4s._
 import org.http4s.implicits._
 import org.http4s.server.Router
-import org.http4s.server.blaze.BlazeServerBuilder
+import org.http4s.blaze.server.BlazeServerBuilder
 import org.http4s.server.middleware._
 import org.renci.cam.HttpClient.HttpClient
 import org.renci.cam.Utilities._