diff --git a/src/main/scala/gitbucket/core/model/Activity.scala b/src/main/scala/gitbucket/core/model/Activity.scala
index a7ca6fb..e35e1e3 100644
--- a/src/main/scala/gitbucket/core/model/Activity.scala
+++ b/src/main/scala/gitbucket/core/model/Activity.scala
@@ -11,7 +11,7 @@
   lazy val Activities = TableQuery[Activities]
 
   class Activities(tag: Tag) extends Table[Activity](tag, "ACTIVITY") with BasicTemplate {
-    def * = ???
+    def * : slick.lifted.ProvenShape[Activity] = ???
   }
 }
 
diff --git a/src/main/scala/gitbucket/core/util/DatabaseConfig.scala b/src/main/scala/gitbucket/core/util/DatabaseConfig.scala
index 75420d0..c5f9e59 100644
--- a/src/main/scala/gitbucket/core/util/DatabaseConfig.scala
+++ b/src/main/scala/gitbucket/core/util/DatabaseConfig.scala
@@ -99,26 +99,26 @@
 
   object H2 extends DatabaseType {
     val jdbcDriver = "org.h2.Driver"
-    val slickDriver = BlockingH2Driver
-    val liquiDriver = new H2Database()
+    val slickDriver: BlockingJdbcProfile = BlockingH2Driver
+    val liquiDriver: AbstractJdbcDatabase = new H2Database()
   }
 
   object MySQL extends DatabaseType {
     val jdbcDriver = "org.mariadb.jdbc.Driver"
-    val slickDriver = BlockingMySQLDriver
-    val liquiDriver = new MySQLDatabase()
+    val slickDriver: BlockingJdbcProfile = BlockingMySQLDriver
+    val liquiDriver: AbstractJdbcDatabase = new MySQLDatabase()
   }
 
   object MariaDb extends DatabaseType {
     val jdbcDriver = "org.mariadb.jdbc.Driver"
-    val slickDriver = BlockingMySQLDriver
-    val liquiDriver = new MariaDBDatabase()
+    val slickDriver: BlockingJdbcProfile = BlockingMySQLDriver
+    val liquiDriver: AbstractJdbcDatabase = new MariaDBDatabase()
   }
 
   object PostgreSQL extends DatabaseType {
     val jdbcDriver = "org.postgresql.Driver2"
-    val slickDriver = BlockingPostgresDriver
-    val liquiDriver = new PostgresDatabase()
+    val slickDriver: BlockingJdbcProfile = BlockingPostgresDriver
+    val liquiDriver: AbstractJdbcDatabase = new PostgresDatabase()
   }
 
   object BlockingPostgresDriver extends slick.jdbc.PostgresProfile with BlockingJdbcProfile {
diff --git a/src/test/scala/gitbucket/core/GitBucketCoreModuleSpec.scala b/src/test/scala/gitbucket/core/GitBucketCoreModuleSpec.scala
index 39704e4..efd96c6 100644
--- a/src/test/scala/gitbucket/core/GitBucketCoreModuleSpec.scala
+++ b/src/test/scala/gitbucket/core/GitBucketCoreModuleSpec.scala
@@ -24,15 +24,16 @@
     )
   }
 
-  implicit private val suiteDescription = Description.createSuiteDescription(getClass)
+  implicit private val suiteDescription: Description = Description.createSuiteDescription(getClass)
 
   Seq("8.0", "5.7").foreach { tag =>
     test(s"Migration MySQL $tag", ExternalDBTest) {
       val container = new MySQLContainer() {
-        override val container = new org.testcontainers.containers.MySQLContainer(s"mysql:$tag") {
-          override def getDriverClassName = "org.mariadb.jdbc.Driver"
-          override def getJdbcUrl: String = super.getJdbcUrl + "?permitMysqlScheme"
-        }
+        override val container: org.testcontainers.containers.MySQLContainer[_] =
+          new org.testcontainers.containers.MySQLContainer(s"mysql:$tag") {
+            override def getDriverClassName = "org.mariadb.jdbc.Driver"
+            override def getJdbcUrl: String = super.getJdbcUrl + "?permitMysqlScheme"
+          }
         // TODO https://jira.mariadb.org/browse/CONJ-663
         container.withCommand("mysqld --default-authentication-plugin=mysql_native_password")
       }
diff --git a/src/test/scala/gitbucket/core/api/ApiSpecModels.scala b/src/test/scala/gitbucket/core/api/ApiSpecModels.scala
index 9c28f05..fca9981 100644
--- a/src/test/scala/gitbucket/core/api/ApiSpecModels.scala
+++ b/src/test/scala/gitbucket/core/api/ApiSpecModels.scala
@@ -13,7 +13,7 @@
 
 object ApiSpecModels {
 
-  implicit val context = JsonFormat.Context("http://gitbucket.exmple.com", None)
+  implicit val context: JsonFormat.Context = JsonFormat.Context("http://gitbucket.exmple.com", None)
 
   val date1 = {
     val d = Calendar.getInstance(TimeZone.getTimeZone("UTC"))
diff --git a/src/test/scala/gitbucket/core/api/JsonFormatSpec.scala b/src/test/scala/gitbucket/core/api/JsonFormatSpec.scala
index 5845cef..ef3112e 100644
--- a/src/test/scala/gitbucket/core/api/JsonFormatSpec.scala
+++ b/src/test/scala/gitbucket/core/api/JsonFormatSpec.scala
@@ -1,11 +1,12 @@
 package gitbucket.core.api
 
+import org.json4s.Formats
 import org.json4s.jackson.JsonMethods
 import org.scalatest.funsuite.AnyFunSuite
 
 class JsonFormatSpec extends AnyFunSuite {
   import ApiSpecModels._
-  implicit val format = JsonFormat.jsonFormats
+  implicit val format: Formats = JsonFormat.jsonFormats
 
   private def expected(json: String) = json.replaceAll("\n", "")
   def normalizeJson(json: String) = {
diff --git a/src/test/scala/gitbucket/core/view/HelpersSpec.scala b/src/test/scala/gitbucket/core/view/HelpersSpec.scala
index 3b05366..8ec3ee7 100644
--- a/src/test/scala/gitbucket/core/view/HelpersSpec.scala
+++ b/src/test/scala/gitbucket/core/view/HelpersSpec.scala
@@ -9,7 +9,7 @@
 
 class HelpersSpec extends AnyFunSpec {
 
-  private implicit val context = mock(classOf[Context])
+  private implicit val context: Context = mock(classOf[Context])
   private val repository = mock(classOf[RepositoryInfo])
 
   import helpers._