diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ab5c5c841..2fa3a98d0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -80,11 +80,11 @@ jobs:
 
       - name: Make target directories
         if: github.event_name != 'pull_request' && (startsWith(github.ref, 'refs/tags/v') || github.ref == 'refs/heads/scala3')
-        run: mkdir -p runtime/.js/target spire/.js/target spire/.jvm/target testkit/.native/target units/.jvm/target runtime/.native/target testkit/.js/target parser/.jvm/target unidocs/target parser/.js/target core/.native/target pureconfig/.jvm/target spire/.native/target parser/.native/target core/.js/target units/.native/target runtime/.jvm/target core/.jvm/target refined/.native/target refined/.js/target refined/.jvm/target units/.js/target testkit/.jvm/target project/target
+        run: mkdir -p runtime/.js/target spire/.js/target spire/.jvm/target testkit/.native/target units/.jvm/target runtime/.native/target testkit/.js/target parser/.jvm/target unidocs/target parser/.js/target core/.native/target ciris/.js/target pureconfig/.jvm/target spire/.native/target parser/.native/target core/.js/target ciris/.jvm/target units/.native/target runtime/.jvm/target core/.jvm/target refined/.native/target refined/.js/target ciris/.native/target refined/.jvm/target units/.js/target testkit/.jvm/target project/target
 
       - name: Compress target directories
         if: github.event_name != 'pull_request' && (startsWith(github.ref, 'refs/tags/v') || github.ref == 'refs/heads/scala3')
-        run: tar cf targets.tar runtime/.js/target spire/.js/target spire/.jvm/target testkit/.native/target units/.jvm/target runtime/.native/target testkit/.js/target parser/.jvm/target unidocs/target parser/.js/target core/.native/target pureconfig/.jvm/target spire/.native/target parser/.native/target core/.js/target units/.native/target runtime/.jvm/target core/.jvm/target refined/.native/target refined/.js/target refined/.jvm/target units/.js/target testkit/.jvm/target project/target
+        run: tar cf targets.tar runtime/.js/target spire/.js/target spire/.jvm/target testkit/.native/target units/.jvm/target runtime/.native/target testkit/.js/target parser/.jvm/target unidocs/target parser/.js/target core/.native/target ciris/.js/target pureconfig/.jvm/target spire/.native/target parser/.native/target core/.js/target ciris/.jvm/target units/.native/target runtime/.jvm/target core/.jvm/target refined/.native/target refined/.js/target ciris/.native/target refined/.jvm/target units/.js/target testkit/.jvm/target project/target
 
       - name: Upload target directories
         if: github.event_name != 'pull_request' && (startsWith(github.ref, 'refs/tags/v') || github.ref == 'refs/heads/scala3')
diff --git a/build.sbt b/build.sbt
index c4251f9d5..60bc32e93 100644
--- a/build.sbt
+++ b/build.sbt
@@ -46,6 +46,7 @@ lazy val root = tlCrossRootProject
         runtime,
         parser,
         pureconfig,
+        ciris,
         spire,
         refined,
         testkit,
@@ -135,6 +136,28 @@ lazy val pureconfig = crossProject(
         libraryDependencies += "com.github.pureconfig" %%% "pureconfig-core" % "0.17.4"
     )
 
+lazy val ciris = crossProject(
+    JVMPlatform,
+    JSPlatform,
+    NativePlatform
+)
+    .crossType(CrossType.Pure)
+    .in(file("ciris"))
+    .settings(name := "coulomb-ciris")
+    .dependsOn(
+        core % "compile->compile;test->test",
+        runtime,
+        parser,
+        units % Test
+    )
+    .settings(
+        tlVersionIntroduced := Map("3" -> "0.8.1")
+    )
+    .settings(commonSettings: _*)
+    .settings(
+        libraryDependencies += "is.cir" %%% "ciris" % "3.3.0"
+    )
+
 lazy val spire = crossProject(JVMPlatform, JSPlatform, NativePlatform)
     .crossType(CrossType.Pure)
     .in(file("spire"))
@@ -180,6 +203,7 @@ lazy val all = project
         runtime.jvm,
         parser.jvm,
         pureconfig.jvm,
+        ciris.jvm,
         spire.jvm,
         refined.jvm
     ) // scala repl only needs JVMPlatform subproj builds
@@ -210,6 +234,7 @@ lazy val docs = project
         runtime.jvm,
         parser.jvm,
         pureconfig.jvm,
+        ciris.jvm,
         spire.jvm,
         refined.jvm
     )
diff --git a/ciris/src/main/scala/coulomb/ciris.scala b/ciris/src/main/scala/coulomb/ciris.scala
new file mode 100644
index 000000000..b9a09d76f
--- /dev/null
+++ b/ciris/src/main/scala/coulomb/ciris.scala
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2022 Erik Erlandson
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package coulomb.ciris
+
+object test:
+    val stub = 0