diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e72b79fef2..0791454a7a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,7 +28,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-22.04]
-        scala: [2.13, 2.12]
+        scala: [3, 2.12]
         java: [corretto@17, corretto@21, corretto@25]
         exclude:
           - scala: 2.12
@@ -189,12 +189,12 @@ jobs:
         if: matrix.java == 'corretto@25' && steps.setup-java-corretto-25.outputs.cache-hit == 'false'
         run: sbt +update
 
-      - name: Download target directories (2.13)
+      - name: Download target directories (3)
         uses: actions/download-artifact@v6
         with:
-          name: target-${{ matrix.os }}-${{ matrix.java }}-2.13
+          name: target-${{ matrix.os }}-${{ matrix.java }}-3
 
-      - name: Inflate target directories (2.13)
+      - name: Inflate target directories (3)
         run: |
           tar xf targets.tar
           rm targets.tar
@@ -301,7 +301,7 @@ jobs:
       - name: Submit Dependencies
         uses: scalacenter/sbt-dependency-submission@v2
         with:
-          modules-ignore: scio_2.13 scio_2.12 scio-examples_2.13 scio-examples_2.12 integration_2.13 integration_2.12 scio-jmh_2.13 scio-jmh_2.12 socco-plugin_2.13 socco-plugin_2.12
+          modules-ignore: scio_3 scio_2.12 scio-examples_3 scio-examples_2.12 integration_3 integration_2.12 scio-jmh_3 scio-jmh_2.12 socco-plugin_3 socco-plugin_2.12
           configs-ignore: test scala-tool scala-doc-tool test-internal
 
   validate-steward:
@@ -334,7 +334,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-22.04]
-        scala: [2.13]
+        scala: [3]
         java: [corretto@17]
     runs-on: ${{ matrix.os }}
     steps:
@@ -373,7 +373,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-22.04]
-        scala: [2.13]
+        scala: [3]
         java: [corretto@17]
     runs-on: ${{ matrix.os }}
     steps:
@@ -406,7 +406,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-22.04]
-        scala: [2.13]
+        scala: [3]
         java: [corretto@17]
     runs-on: ${{ matrix.os }}
     steps:
@@ -456,7 +456,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-22.04]
-        scala: [2.13]
+        scala: [3]
         java: [corretto@17]
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/build.sbt b/build.sbt
index c3f0f96168..73648cde97 100644
--- a/build.sbt
+++ b/build.sbt
@@ -145,7 +145,7 @@ ThisBuild / startYear := Some(2016)
 ThisBuild / licenses := Seq(License.Apache2)
 
 // scala versions
-val scala213 = "2.13.18"
+val scala213 = "3.8.3"
 val scala212 = "2.12.21"
 val scalaDefault = scala213