diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index bfb2575d..e4cf8512 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -22,7 +22,7 @@ jobs:
           arguments: "-c .scalafmt.conf --test core akka examples"
       - uses: jodersky/setup-mill@v0.3.0
         with:
-          mill-version: 0.11.12
+          mill-version: 0.12.2
       - name: Compile
         run: mill '_._[_].compile'
       - name: Test
diff --git a/.github/workflows/publish_snapshot.yml b/.github/workflows/publish_snapshot.yml
index d959d430..02802c3c 100644
--- a/.github/workflows/publish_snapshot.yml
+++ b/.github/workflows/publish_snapshot.yml
@@ -15,7 +15,7 @@ jobs:
         uses: actions/checkout@v2
       - uses: jodersky/setup-mill@v0.3.0
         with:
-          mill-version: 0.11.12
+          mill-version: 0.12.2
       - name: Import GPG key
         id: import_gpg
         uses: crazy-max/ghaction-import-gpg@v3
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 18dc9e33..a96577d7 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -11,7 +11,7 @@ jobs:
         uses: actions/checkout@v2
       - uses: jodersky/setup-mill@v0.3.0
         with:
-          mill-version: 0.11.12
+          mill-version: 0.12.2
       - name: Import GPG key
         id: import_gpg
         uses: crazy-max/ghaction-import-gpg@v3
diff --git a/.mill-version b/.mill-version
index bd0119f9..26acbf08 100644
--- a/.mill-version
+++ b/.mill-version
@@ -1 +1 @@
-0.11.12
+0.12.2
diff --git a/build.sc b/build.sc
index 353470b9..a652c67b 100644
--- a/build.sc
+++ b/build.sc
@@ -2,7 +2,7 @@ import mill._
 import mill.scalalib._
 import mill.scalalib.publish._
 
-val ScalaVersions = Seq("2.12.20", "2.13.14")
+val ScalaVersions = Seq("2.12.20", "2.13.15")
 
 object library {