diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0c2ba68c48..39c4df1b24 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -32,7 +32,7 @@ jobs:
           - ubuntu-22.04-arm
           - windows-latest
           - macos-14
-        scala: [3.3.5, 2.12.20, 2.13.16]
+        scala: [3.3.7, 2.12.20, 2.13.16]
         java:
           - temurin@8
           - temurin@11
@@ -41,9 +41,9 @@ jobs:
           - graalvm@21
         ci: [ciJVM, ciNative, ciJS, ciFirefox, ciChrome]
         exclude:
-          - scala: 3.3.5
+          - scala: 3.3.7
             java: temurin@11
-          - scala: 3.3.5
+          - scala: 3.3.7
             java: temurin@21
           - scala: 2.12.20
             java: temurin@11
@@ -62,10 +62,10 @@ jobs:
           - os: ubuntu-22.04-arm
             java: graalvm@21
           - os: windows-latest
-            scala: 3.3.5
+            scala: 3.3.7
             ci: ciJVM
           - os: macos-14
-            scala: 3.3.5
+            scala: 3.3.7
             ci: ciJVM
           - os: windows-latest
             scala: 2.12.20
@@ -78,9 +78,9 @@ jobs:
           - os: macos-14
             java: temurin@11
           - ci: ciFirefox
-            scala: 3.3.5
+            scala: 3.3.7
           - ci: ciChrome
-            scala: 3.3.5
+            scala: 3.3.7
           - ci: ciFirefox
             scala: 2.12.20
           - ci: ciChrome
@@ -287,24 +287,24 @@ jobs:
         run: sbt githubWorkflowCheck
 
       - name: Check that scalafix has been run on JVM
-        if: matrix.ci == 'ciJVM' && matrix.scala != '3.3.5' && matrix.java == 'temurin@8' && matrix.os == 'ubuntu-latest'
+        if: matrix.ci == 'ciJVM' && matrix.scala != '3.3.7' && matrix.java == 'temurin@8' && matrix.os == 'ubuntu-latest'
         shell: bash
         run: sbt '++ ${{ matrix.scala }}' 'rootJVM/scalafixAll --check'
 
       - name: Check that scalafix has been run on JS
-        if: matrix.ci == 'ciJS' && matrix.scala != '3.3.5' && matrix.java == 'temurin@8' && matrix.os == 'ubuntu-latest'
+        if: matrix.ci == 'ciJS' && matrix.scala != '3.3.7' && matrix.java == 'temurin@8' && matrix.os == 'ubuntu-latest'
         shell: bash
         run: sbt '++ ${{ matrix.scala }}' 'rootJS/scalafixAll --check'
 
       - name: Check that scalafix has been run on Native
-        if: matrix.ci == 'ciNative' && matrix.scala != '3.3.5' && matrix.java == 'temurin@8' && matrix.os == 'ubuntu-latest'
+        if: matrix.ci == 'ciNative' && matrix.scala != '3.3.7' && matrix.java == 'temurin@8' && matrix.os == 'ubuntu-latest'
         shell: bash
         run: sbt '++ ${{ matrix.scala }}' 'rootNative/scalafixAll --check'
 
       - shell: bash
         run: sbt '++ ${{ matrix.scala }}' '${{ matrix.ci }}'
 
-      - if: (matrix.scala == '2.13.16' || matrix.scala == '3.3.5') && matrix.ci == 'ciJVM' && matrix.java == 'temurin@17'
+      - if: (matrix.scala == '2.13.16' || matrix.scala == '3.3.7') && matrix.ci == 'ciJVM' && matrix.java == 'temurin@17'
         shell: bash
         run: sbt '++ ${{ matrix.scala }}' docs/mdoc
 
@@ -324,7 +324,7 @@ jobs:
         run: example/test-native.sh ${{ matrix.scala }}
 
       - name: Test GraalVM Native Image
-        if: (matrix.scala == '2.13.16' || matrix.scala == '3.3.5') && matrix.java == 'graalvm@21' && matrix.os == 'ubuntu-latest'
+        if: (matrix.scala == '2.13.16' || matrix.scala == '3.3.7') && matrix.java == 'graalvm@21' && matrix.os == 'ubuntu-latest'
         shell: bash
         run: sbt '++ ${{ matrix.scala }}' graalVMExample/nativeImage graalVMExample/nativeImageRun
 
@@ -439,32 +439,32 @@ jobs:
         if: matrix.java == 'graalvm@21' && steps.setup-java-graalvm-21.outputs.cache-hit == 'false'
         run: sbt +update
 
-      - name: Download target directories (3.3.5, ciJVM)
+      - name: Download target directories (3.3.7, ciJVM)
         uses: actions/download-artifact@v4
         with:
-          name: target-${{ matrix.os }}-${{ matrix.java }}-3.3.5-ciJVM
+          name: target-${{ matrix.os }}-${{ matrix.java }}-3.3.7-ciJVM
 
-      - name: Inflate target directories (3.3.5, ciJVM)
+      - name: Inflate target directories (3.3.7, ciJVM)
         run: |
           tar xf targets.tar
           rm targets.tar
 
-      - name: Download target directories (3.3.5, ciNative)
+      - name: Download target directories (3.3.7, ciNative)
         uses: actions/download-artifact@v4
         with:
-          name: target-${{ matrix.os }}-${{ matrix.java }}-3.3.5-ciNative
+          name: target-${{ matrix.os }}-${{ matrix.java }}-3.3.7-ciNative
 
-      - name: Inflate target directories (3.3.5, ciNative)
+      - name: Inflate target directories (3.3.7, ciNative)
         run: |
           tar xf targets.tar
           rm targets.tar
 
-      - name: Download target directories (3.3.5, ciJS)
+      - name: Download target directories (3.3.7, ciJS)
         uses: actions/download-artifact@v4
         with:
-          name: target-${{ matrix.os }}-${{ matrix.java }}-3.3.5-ciJS
+          name: target-${{ matrix.os }}-${{ matrix.java }}-3.3.7-ciJS
 
-      - name: Inflate target directories (3.3.5, ciJS)
+      - name: Inflate target directories (3.3.7, ciJS)
         run: |
           tar xf targets.tar
           rm targets.tar
diff --git a/build.sbt b/build.sbt
index 437677c02f..adb0bdb96b 100644
--- a/build.sbt
+++ b/build.sbt
@@ -116,7 +116,7 @@ val MacOS = "macos-14"
 
 val Scala212 = "2.12.20"
 val Scala213 = "2.13.16"
-val Scala3 = "3.3.5"
+val Scala3 = "3.3.7"
 
 ThisBuild / crossScalaVersions := Seq(Scala3, Scala212, Scala213)
 ThisBuild / githubWorkflowScalaVersions := crossScalaVersions.value
diff --git a/core/native/src/main/scala/cats/effect/unsafe/LocalQueuePadding.scala b/core/native/src/main/scala/cats/effect/unsafe/LocalQueuePadding.scala
index c0573f6f75..f8f04a0198 100644
--- a/core/native/src/main/scala/cats/effect/unsafe/LocalQueuePadding.scala
+++ b/core/native/src/main/scala/cats/effect/unsafe/LocalQueuePadding.scala
@@ -82,14 +82,6 @@ private class Tail extends Head {
    * integer value are ignored in most operations).
    */
   protected var tail: Int = 0
-
-  @volatile
-  private[this] var tailPublisher: Int = 0
-
-  {
-    // prevent unused warnings
-    tailPublisher = 0
-  }
 }
 
 private object Tail {
diff --git a/kernel-testkit/shared/src/main/scala/cats/effect/kernel/testkit/PureConcGenerators.scala b/kernel-testkit/shared/src/main/scala/cats/effect/kernel/testkit/PureConcGenerators.scala
index e3e43296fb..e35a7e5e68 100644
--- a/kernel-testkit/shared/src/main/scala/cats/effect/kernel/testkit/PureConcGenerators.scala
+++ b/kernel-testkit/shared/src/main/scala/cats/effect/kernel/testkit/PureConcGenerators.scala
@@ -36,9 +36,6 @@ object PureConcGenerators {
 
       val F: GenSpawn[PureConc[E, *], E] = allocateForPureConc[E]
 
-      def cogenCase[A: Cogen]: Cogen[Outcome[PureConc[E, *], E, A]] =
-        OutcomeGenerators.cogenOutcome[PureConc[E, *], E, A]
-
       override def recursiveGen[B: Arbitrary: Cogen](deeper: GenK[PureConc[E, *]]) =
         super
           .recursiveGen[B](deeper)
diff --git a/kernel/shared/src/main/scala/cats/effect/kernel/Async.scala b/kernel/shared/src/main/scala/cats/effect/kernel/Async.scala
index f6fe851aa9..f9e20e1c4e 100644
--- a/kernel/shared/src/main/scala/cats/effect/kernel/Async.scala
+++ b/kernel/shared/src/main/scala/cats/effect/kernel/Async.scala
@@ -21,7 +21,9 @@ import cats.arrow.FunctionK
 import cats.data.{EitherT, Ior, IorT, Kleisli, OptionT, WriterT}
 import cats.implicits._
 
-import scala.annotation.{nowarn, tailrec}
+import org.typelevel.scalaccompat.annotation.unused
+
+import scala.annotation.tailrec
 import scala.concurrent.{ExecutionContext, Future}
 
 import java.util.concurrent.Executor
@@ -296,8 +298,7 @@ trait Async[F[_]] extends AsyncPlatform[F] with Sync[F] with Temporal[F] {
    * @param limit
    *   The maximum number of stages to evaluate prior to forcibly yielding to `F`
    */
-  @nowarn("msg=never used")
-  def syncStep[G[_], A](fa: F[A], limit: Int)(implicit G: Sync[G]): G[Either[F[A], A]] =
+  def syncStep[G[_], A](fa: F[A], @unused limit: Int)(implicit G: Sync[G]): G[Either[F[A], A]] =
     G.pure(Left(fa))
 
   /*
diff --git a/testkit/shared/src/main/scala/cats/effect/testkit/TestInstances.scala b/testkit/shared/src/main/scala/cats/effect/testkit/TestInstances.scala
index 5999ac86b5..e85a143a3e 100644
--- a/testkit/shared/src/main/scala/cats/effect/testkit/TestInstances.scala
+++ b/testkit/shared/src/main/scala/cats/effect/testkit/TestInstances.scala
@@ -56,9 +56,6 @@ trait TestInstances extends ParallelFGenerators with OutcomeGenerators with Sync
 
         val F: Async[IO] = IO.asyncForIO
 
-        def cogenCase[B: Cogen]: Cogen[OutcomeIO[B]] =
-          OutcomeGenerators.cogenOutcome[IO, Throwable, B]
-
         val arbitraryEC: Arbitrary[ExecutionContext] = outer.arbitraryExecutionContext
 
         val cogenFU: Cogen[IO[Unit]] = cogenIO[Unit]
diff --git a/tests/shared/src/test/scala/cats/effect/ThunkSuite.scala b/tests/shared/src/test/scala/cats/effect/ThunkSuite.scala
index 60e2ee141d..39f836ae73 100644
--- a/tests/shared/src/test/scala/cats/effect/ThunkSuite.scala
+++ b/tests/shared/src/test/scala/cats/effect/ThunkSuite.scala
@@ -20,7 +20,7 @@ class ThunkSuite extends BaseSuite {
 
   testUnit("return the same function") {
     var i = 0
-    val f = () => i += 1
+    val f = () => { i = i + 1 }
     assertEquals(IO.delay(f()).asInstanceOf[IO.Delay[Unit]].thunk, f)
   }