diff --git a/build.sbt b/build.sbt
index 116d3bd7..05e0c5c1 100644
--- a/build.sbt
+++ b/build.sbt
@@ -40,8 +40,8 @@ lazy val pluginSettings: Seq[Def.Setting[_]] = Seq(
   addSbtPlugin("com.typesafe.sbt" % "sbt-ghpages" % "0.6.3"),
   addSbtPlugin("com.typesafe.sbt" % "sbt-site"    % "1.4.1"),
   libraryDependencies ++= Seq(
-    "com.47deg"             %% "github4s"            % "0.28.5",
-    "org.http4s"            %% "http4s-blaze-client" % "0.21.31",
+    "com.47deg"             %% "github4s"            % "0.30.0",
+    "org.http4s"            %% "http4s-blaze-client" % "0.23.7",
     "net.jcazevedo"         %% "moultingyaml"        % "0.4.2",
     "com.lihaoyi"           %% "scalatags"           % "0.11.1",
     "com.sksamuel.scrimage" %% "scrimage-scala"      % "4.0.25",
diff --git a/project/dependencies.sbt b/project/dependencies.sbt
index 4b70616c..7399315d 100644
--- a/project/dependencies.sbt
+++ b/project/dependencies.sbt
@@ -5,8 +5,9 @@ unmanagedResourceDirectories in Compile +=
   baseDirectory.in(ThisBuild).value.getParentFile / "src" / "main" / "resources"
 
 libraryDependencies ++= Seq(
-  "com.47deg"             %% "github4s"       % "0.24.0",
-  "net.jcazevedo"         %% "moultingyaml"   % "0.4.2",
-  "com.lihaoyi"           %% "scalatags"      % "0.11.1",
-  "com.sksamuel.scrimage" %% "scrimage-scala" % "4.0.25"
+  "com.47deg"             %% "github4s"            % "0.30.0",
+  "org.http4s"            %% "http4s-blaze-client" % "0.23.7",
+  "net.jcazevedo"         %% "moultingyaml"        % "0.4.2",
+  "com.lihaoyi"           %% "scalatags"           % "0.11.1",
+  "com.sksamuel.scrimage" %% "scrimage-scala"      % "4.0.25"
 )
diff --git a/src/main/scala/microsites/MicrositeKeys.scala b/src/main/scala/microsites/MicrositeKeys.scala
index bb0dc64d..69d62151 100644
--- a/src/main/scala/microsites/MicrositeKeys.scala
+++ b/src/main/scala/microsites/MicrositeKeys.scala
@@ -18,7 +18,8 @@ package microsites
 
 import java.nio.file._
 
-import cats.effect.{ContextShift, IO, Timer}
+import cats.effect.IO
+import cats.effect.unsafe.implicits.global
 import com.typesafe.sbt.sbtghpages.GhpagesPlugin.autoImport._
 import com.typesafe.sbt.site.SitePlugin.autoImport.makeSite
 import io.circe._
@@ -30,7 +31,7 @@ import microsites.ioops.FileWriter._
 import microsites.ioops._
 import microsites.ioops.syntax._
 import microsites.util.MicrositeHelper
-import org.http4s.client.blaze.BlazeClientBuilder
+import org.http4s.blaze.client.BlazeClientBuilder
 import sbt.Keys._
 import sbt._
 import sbt.complete.DefaultParsers.OptNotSpace
@@ -476,9 +477,7 @@ trait MicrositeAutoImportSettings extends MicrositeKeys {
       val githubRepo: String            = micrositeGithubRepo.value
       val githubToken: Option[String]   = micrositeGithubToken.value
 
-      implicit val cs: ContextShift[IO] = IO.contextShift(ExecutionContext.global)
-      implicit val ec: ExecutionContext = ExecutionContext.global
-      implicit val t: Timer[IO]         = IO.timer(ExecutionContext.global)
+      implicit val executionContext: ExecutionContext = ExecutionContext.global
 
       lazy val log: Logger = streams.value.log
 
@@ -492,7 +491,7 @@ trait MicrositeAutoImportSettings extends MicrositeKeys {
                  | * repo: $githubOwner/$githubRepo
                  | * commitMessage: $commitMessage""".stripMargin)
 
-            BlazeClientBuilder[IO](ec).resource
+            BlazeClientBuilder[IO].resource
               .use { client =>
                 val ghOps: GitHubOps[IO] =
                   new GitHubOps[IO](client, githubOwner, githubRepo, githubToken)
diff --git a/src/main/scala/microsites/github/GitHubOps.scala b/src/main/scala/microsites/github/GitHubOps.scala
index 004fea46..93728807 100644
--- a/src/main/scala/microsites/github/GitHubOps.scala
+++ b/src/main/scala/microsites/github/GitHubOps.scala
@@ -19,9 +19,9 @@ package microsites.github
 import java.io.File
 
 import cats.data.{NonEmptyList, OptionT}
-import cats.effect._
+import cats.effect.{Ref => _, _}
+import cats.effect.kernel.Temporal
 import cats.implicits._
-import com.github.marklister.base64.Base64._
 import github4s._
 import github4s.domain._
 import microsites.Exceptions._
@@ -32,7 +32,9 @@ import org.http4s.client._
 import scala.concurrent.ExecutionContext
 import scala.concurrent.duration._
 
-class GitHubOps[F[_]: ConcurrentEffect: Timer](
+import java.util.Base64
+
+class GitHubOps[F[_]: Async: Temporal](
     client: Client[F],
     owner: String,
     repo: String,
@@ -113,7 +115,15 @@ class GitHubOps[F[_]: ConcurrentEffect: Timer](
       ): F[TreeDataSha] =
         for {
           gh <- ghWithRateLimit
-          res <- run(gh.gitData.createBlob(owner, repo, array.toBase64, Some("base64"), headers))
+          res <- run(
+            gh.gitData.createBlob(
+              owner,
+              repo,
+              Base64.getEncoder().encode(array).mkString(""),
+              Some("base64"),
+              headers
+            )
+          )
             .map(refInfo => TreeDataSha(filePath, blobMode, blobType, refInfo.sha))
         } yield res
 
@@ -210,5 +220,5 @@ class GitHubOps[F[_]: ConcurrentEffect: Timer](
 
   // Due to GitHub abuse rate limits, we should wait 1 sec between each request
   // https://developer.github.com/guides/best-practices-for-integrators/#dealing-with-abuse-rate-limits
-  def ghWithRateLimit: F[Github[F]] = Timer[F].sleep(1.second).as(gh)
+  def ghWithRateLimit: F[Github[F]] = Temporal[F].sleep(1.second).as(gh)
 }