diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index dbd1f23..5396e4e 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -29,7 +29,7 @@
     - name: Run tests
       run: sbt scalafmtSbtCheck scalafmtCheckAll test
     - name: Scala 3
-      run: sbt '++ 3.2.2!' update # TODO
+      run: sbt '++ 3.x' test
     - name: Build executable
       run: sbt executable
     - name: Upload artifacts
diff --git a/build.sbt b/build.sbt
index e19aeec..ad5178e 100644
--- a/build.sbt
+++ b/build.sbt
@@ -17,6 +17,17 @@
 version := GitBucketVersion
 scalaVersion := "2.13.10"
 
+crossScalaVersions += "3.2.2"
+
+conflictWarning := {
+  if (scalaBinaryVersion.value == "3") {
+    // TODO remove this workaround
+    ConflictWarning("warn", Level.Warn, false)
+  } else {
+    conflictWarning.value
+  }
+}
+
 // scalafmtOnCompile := true
 
 coverageExcludedPackages := ".*\\.html\\..*"
@@ -30,10 +41,10 @@
 libraryDependencies ++= Seq(
   "org.eclipse.jgit"                % "org.eclipse.jgit.http.server" % JgitVersion,
   "org.eclipse.jgit"                % "org.eclipse.jgit.archive"     % JgitVersion,
-  "org.scalatra"                    %% "scalatra"                    % ScalatraVersion cross CrossVersion.for3Use2_13,
-  "org.scalatra"                    %% "scalatra-json"               % ScalatraVersion cross CrossVersion.for3Use2_13,
-  "org.scalatra"                    %% "scalatra-forms"              % ScalatraVersion cross CrossVersion.for3Use2_13,
-  "org.json4s"                      %% "json4s-jackson"              % "4.0.6" cross CrossVersion.for3Use2_13,
+  "org.scalatra"                    %% "scalatra"                    % ScalatraVersion,
+  "org.scalatra"                    %% "scalatra-json"               % ScalatraVersion,
+  "org.scalatra"                    %% "scalatra-forms"              % ScalatraVersion,
+  "org.json4s"                      %% "json4s-jackson"              % "4.0.6",
   "commons-io"                      % "commons-io"                   % "2.11.0",
   "io.github.gitbucket"             % "solidbase"                    % "1.0.5",
   "io.github.gitbucket"             % "markedj"                      % "1.0.17",
@@ -60,7 +71,7 @@
   "org.eclipse.jetty"               % "jetty-webapp"                 % JettyVersion % "provided",
   "javax.servlet"                   % "javax.servlet-api"            % "3.1.0" % "provided",
   "junit"                           % "junit"                        % "4.13.2" % "test",
-  "org.scalatra"                    %% "scalatra-scalatest"          % ScalatraVersion % "test" cross CrossVersion.for3Use2_13,
+  "org.scalatra"                    %% "scalatra-scalatest"          % ScalatraVersion % "test",
   "org.mockito"                     % "mockito-core"                 % "4.11.0" % "test",
   "com.dimafeng"                    %% "testcontainers-scala"        % "0.40.15" % "test",
   "org.testcontainers"              % "mysql"                        % "1.18.0" % "test",