diff --git a/.gitmodules b/.gitmodules
index 15041fcb15fa..635c564ca56b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -100,3 +100,11 @@
 [submodule "community-build/community-projects/scas"]
 	path = community-build/community-projects/scas
 	url = https://github.com/dotty-staging/scas.git
+[submodule "community-build/community-projects/cats-effect-2"]
+	path = community-build/community-projects/cats-effect-2
+	url = https://github.com/dotty-staging/cats-effect.git
+	branch = series/2.x
+[submodule "community-build/community-projects/cats-effect-3"]
+	path = community-build/community-projects/cats-effect-3
+	url = https://github.com/dotty-staging/cats-effect.git
+	branch = series/3.x
diff --git a/community-build/community-projects/cats-effect-2 b/community-build/community-projects/cats-effect-2
new file mode 160000
index 000000000000..e395f060413e
--- /dev/null
+++ b/community-build/community-projects/cats-effect-2
@@ -0,0 +1 @@
+Subproject commit e395f060413ea6cddbf7a8d1baee3c242a566e79
diff --git a/community-build/community-projects/cats-effect-3 b/community-build/community-projects/cats-effect-3
new file mode 160000
index 000000000000..e7b50ffe9dab
--- /dev/null
+++ b/community-build/community-projects/cats-effect-3
@@ -0,0 +1 @@
+Subproject commit e7b50ffe9dabdbe5af479f4e1c9fd447e71e07f4
diff --git a/community-build/test/scala/dotty/communitybuild/CommunityBuildTest.scala b/community-build/test/scala/dotty/communitybuild/CommunityBuildTest.scala
index e0c9b07bfd55..6e3f2681129b 100644
--- a/community-build/test/scala/dotty/communitybuild/CommunityBuildTest.scala
+++ b/community-build/test/scala/dotty/communitybuild/CommunityBuildTest.scala
@@ -300,6 +300,16 @@ object projects:
     sbtTestCommand = ";json-schemaJVM/compile;algebraJVM/compile;openapiJVM/compile;http4s-server/compile;http4s-client/compile;play-server/compile;play-client/compile;akka-http-server/compile;akka-http-client/compile"
   )
 
+  lazy val catsEffect2 = SbtCommunityProject(
+    project        = "cats-effect-2",
+    sbtTestCommand = "test"
+  )
+
+  lazy val catsEffect3 = SbtCommunityProject(
+    project        = "cats-effect-3",
+    sbtTestCommand = "testIfRelevant"
+  )
+
 end projects
 
 @Category(Array(classOf[TestCategory]))
@@ -363,6 +373,8 @@ class CommunityBuildTest:
 
   @Test def algebra = projects.algebra.run()
   @Test def betterfiles = projects.betterfiles.run()
+  @Test def catsEffect2 = projects.catsEffect2.run()
+  @Test def catsEffect3 = projects.catsEffect3.run()
   @Test def dottyCpsAsync = projects.dottyCpsAsync.run()
   @Test def effpi = projects.effpi.run()
   @Test def endpoints4s = projects.endpoints4s.run()
diff --git a/project/Build.scala b/project/Build.scala
index d92724fe1832..5f2d13a1b10a 100644
--- a/project/Build.scala
+++ b/project/Build.scala
@@ -1265,6 +1265,7 @@ object Build {
         (publishLocal in `dotty-compiler-bootstrapped`).value
         (publishLocal in `sbt-dotty`).value
         (publishLocal in `dotty-bootstrapped`).value
+        (publishLocal in `dotty-library-bootstrappedJS`).value
         // (publishLocal in `dotty-staging`).value
         val pluginText =
           s"""updateOptions in Global ~= (_.withLatestSnapshots(false))