diff --git a/build.sbt b/build.sbt
index 39aba1779..5037f872f 100644
--- a/build.sbt
+++ b/build.sbt
@@ -6,7 +6,7 @@ ThisBuild / tlCiReleaseBranches += "topic/scala3"
 
 Global / concurrentRestrictions += Tags.limit(Tags.Compile, 1)
 
-ThisBuild / crossScalaVersions := Seq("3.4.3")
+ThisBuild / crossScalaVersions := Seq("3.5.1")
 ThisBuild / scalacOptions += "-language:implicitConversions" // TODO
 
 lazy val catsVersion           = "2.12.0"
@@ -20,7 +20,8 @@ lazy val spireVersion          = "0.18.0"
 lazy val refinedVersion        = "0.11.2"
 lazy val lucumaRefinedVersion  = "0.1.3"
 lazy val catsTimeVersion       = "0.5.1"
-lazy val circeVersion          = "0.14.9"
+lazy val circeVersion          = "0.14.10"
+lazy val circeRefinedVersion   = "0.15.1"
 lazy val catsScalacheckVersion = "0.3.2"
 lazy val catsParseVersion      = "1.0.0"
 lazy val kittensVersion        = "3.4.0"
@@ -53,7 +54,7 @@ lazy val core = crossProject(JVMPlatform, JSPlatform)
       "org.typelevel"  %%% "cats-time"      % catsTimeVersion,
       "org.typelevel"  %%% "kittens"        % kittensVersion,
       "io.circe"       %%% "circe-core"     % circeVersion,
-      "io.circe"       %%% "circe-refined"  % circeVersion
+      "io.circe"       %%% "circe-refined"  % circeRefinedVersion
     )
   )
   .jvmConfigure(_.enablePlugins(AutomateHeaderPlugin))
diff --git a/modules/core/shared/src/main/scala/lucuma/core/math/RadialVelocity.scala b/modules/core/shared/src/main/scala/lucuma/core/math/RadialVelocity.scala
index 5c0c94a3d..1c4501b8c 100644
--- a/modules/core/shared/src/main/scala/lucuma/core/math/RadialVelocity.scala
+++ b/modules/core/shared/src/main/scala/lucuma/core/math/RadialVelocity.scala
@@ -8,7 +8,6 @@ import coulomb.*
 import coulomb.ops.algebra.cats.all.given
 import coulomb.policy.spire.standard.given
 import coulomb.syntax.*
-import coulomb.units.si.*
 import lucuma.core.math.Constants.SpeedOfLight
 import lucuma.core.math.units.*
 import lucuma.core.optics.Format
diff --git a/modules/core/shared/src/main/scala/lucuma/core/model/SourceProfile.scala b/modules/core/shared/src/main/scala/lucuma/core/model/SourceProfile.scala
index 1e802e4ba..06816b23c 100644
--- a/modules/core/shared/src/main/scala/lucuma/core/model/SourceProfile.scala
+++ b/modules/core/shared/src/main/scala/lucuma/core/model/SourceProfile.scala
@@ -12,7 +12,6 @@ import lucuma.core.math.BrightnessUnits.*
 import lucuma.core.math.BrightnessValue
 import lucuma.core.math.Wavelength
 import lucuma.core.math.dimensional.*
-import lucuma.core.model.SpectralDefinition.BandNormalized
 import monocle.Focus
 import monocle.Lens
 import monocle.Optional
@@ -297,4 +296,4 @@ object SourceProfile {
             .getOption(sp)
             .flatMap(bMap => extractBand[Surface](wavelength, bMap))
         )
-}
\ No newline at end of file
+}
diff --git a/modules/testkit/src/main/scala/lucuma/core/model/arb/ArbTelescopeGuideConfig.scala b/modules/testkit/src/main/scala/lucuma/core/model/arb/ArbTelescopeGuideConfig.scala
index 2541be057..4043ac1d7 100644
--- a/modules/testkit/src/main/scala/lucuma/core/model/arb/ArbTelescopeGuideConfig.scala
+++ b/modules/testkit/src/main/scala/lucuma/core/model/arb/ArbTelescopeGuideConfig.scala
@@ -9,7 +9,6 @@ import lucuma.core.model.M1GuideConfig
 import lucuma.core.model.M2GuideConfig
 import lucuma.core.model.ProbeGuide
 import lucuma.core.model.TelescopeGuideConfig
-import lucuma.core.util.arb.ArbEnumerated.*
 import org.scalacheck.Arbitrary
 import org.scalacheck.Arbitrary.*
 import org.scalacheck.Cogen
diff --git a/modules/testkit/src/main/scala/lucuma/core/model/sequence/arb/ArbExecutionConfig.scala b/modules/testkit/src/main/scala/lucuma/core/model/sequence/arb/ArbExecutionConfig.scala
index 1c70a432c..633f3f3f2 100644
--- a/modules/testkit/src/main/scala/lucuma/core/model/sequence/arb/ArbExecutionConfig.scala
+++ b/modules/testkit/src/main/scala/lucuma/core/model/sequence/arb/ArbExecutionConfig.scala
@@ -4,7 +4,6 @@
 package lucuma.core.model.sequence
 package arb
 
-import lucuma.core.model.sequence.*
 import org.scalacheck.Arbitrary
 import org.scalacheck.Arbitrary.arbitrary
 import org.scalacheck.Cogen
diff --git a/modules/tests/shared/src/test/scala/lucuma/core/math/ApparentRadialVelocitySuite.scala b/modules/tests/shared/src/test/scala/lucuma/core/math/ApparentRadialVelocitySuite.scala
index 2e3b4b0f7..5108ebf0d 100644
--- a/modules/tests/shared/src/test/scala/lucuma/core/math/ApparentRadialVelocitySuite.scala
+++ b/modules/tests/shared/src/test/scala/lucuma/core/math/ApparentRadialVelocitySuite.scala
@@ -8,7 +8,6 @@ import cats.kernel.laws.discipline.*
 import coulomb.*
 import coulomb.policy.spire.standard.given
 import coulomb.syntax.*
-import coulomb.units.si.*
 import lucuma.core.math.Constants.SpeedOfLight
 import lucuma.core.math.arb.*
 import lucuma.core.math.units.*
diff --git a/modules/tests/shared/src/test/scala/lucuma/core/math/RedshiftSuite.scala b/modules/tests/shared/src/test/scala/lucuma/core/math/RedshiftSuite.scala
index b7d701b7c..db11eb33c 100644
--- a/modules/tests/shared/src/test/scala/lucuma/core/math/RedshiftSuite.scala
+++ b/modules/tests/shared/src/test/scala/lucuma/core/math/RedshiftSuite.scala
@@ -8,7 +8,6 @@ import cats.kernel.laws.discipline.*
 import coulomb.*
 import coulomb.policy.spire.standard.given
 import coulomb.syntax.*
-import coulomb.units.si.*
 import lucuma.core.math.Constants.SpeedOfLight
 import lucuma.core.math.arb.*
 import lucuma.core.math.units.*
diff --git a/modules/tests/shared/src/test/scala/lucuma/core/math/WavelengthDitherSuite.scala b/modules/tests/shared/src/test/scala/lucuma/core/math/WavelengthDitherSuite.scala
index 4b1ee7e91..db110e84b 100644
--- a/modules/tests/shared/src/test/scala/lucuma/core/math/WavelengthDitherSuite.scala
+++ b/modules/tests/shared/src/test/scala/lucuma/core/math/WavelengthDitherSuite.scala
@@ -3,7 +3,6 @@
 
 package lucuma.core.math
 
-import cats.Eq
 import cats.syntax.all.*
 import coulomb.*
 import coulomb.ops.algebra.cats.quantity.given