diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a70eef4..a5efe6c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,23 +23,26 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        scala: [2.12.18, 2.13.11]
-        java: [temurin@11]
+        scala: [3.3.3]
+        java: [temurin@17]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
-      - name: Setup Java (temurin@11)
-        if: matrix.java == 'temurin@11'
-        uses: actions/setup-java@v3
+      - name: Setup Java (temurin@17)
+        if: matrix.java == 'temurin@17'
+        uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: 11
+          java-version: 17
           cache: sbt
 
+      - name: Setup sbt
+        uses: sbt/setup-sbt@v1
+
       - name: Check that workflows are up to date
         run: sbt '++ ${{ matrix.scala }}' githubWorkflowCheck
 
@@ -50,7 +53,7 @@ jobs:
         run: tar cf targets.tar target project/target
 
       - name: Upload target directories
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: target-${{ matrix.os }}-${{ matrix.scala }}-${{ matrix.java }}
           path: targets.tar
@@ -62,39 +65,32 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        scala: [2.13.11]
-        java: [temurin@11]
+        scala: [3.3.3]
+        java: [temurin@17]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
-      - name: Setup Java (temurin@11)
-        if: matrix.java == 'temurin@11'
-        uses: actions/setup-java@v3
+      - name: Setup Java (temurin@17)
+        if: matrix.java == 'temurin@17'
+        uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: 11
+          java-version: 17
           cache: sbt
 
-      - name: Download target directories (2.12.18)
-        uses: actions/download-artifact@v3
-        with:
-          name: target-${{ matrix.os }}-2.12.18-${{ matrix.java }}
-
-      - name: Inflate target directories (2.12.18)
-        run: |
-          tar xf targets.tar
-          rm targets.tar
+      - name: Setup sbt
+        uses: sbt/setup-sbt@v1
 
-      - name: Download target directories (2.13.11)
-        uses: actions/download-artifact@v3
+      - name: Download target directories (3.3.3)
+        uses: actions/download-artifact@v4
         with:
-          name: target-${{ matrix.os }}-2.13.11-${{ matrix.java }}
+          name: target-${{ matrix.os }}-3.3.3-${{ matrix.java }}
 
-      - name: Inflate target directories (2.13.11)
+      - name: Inflate target directories (3.3.3)
         run: |
           tar xf targets.tar
           rm targets.tar
diff --git a/.github/workflows/clean.yml b/.github/workflows/clean.yml
index 547aaa4..bfc865d 100644
--- a/.github/workflows/clean.yml
+++ b/.github/workflows/clean.yml
@@ -17,6 +17,7 @@ jobs:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     steps:
       - name: Delete artifacts
+        shell: bash {0}
         run: |
           # Customize those three lines with your repository and credentials:
           REPO=${GITHUB_API_URL}/repos/${{ github.repository }}
@@ -25,7 +26,7 @@ jobs:
           ghapi() { curl --silent --location --user _:$GITHUB_TOKEN "$@"; }
 
           # A temporary file which receives HTTP response headers.
-          TMPFILE=/tmp/tmp.$$
+          TMPFILE=$(mktemp)
 
           # An associative array, key: artifact name, value: number of artifacts of that name.
           declare -A ARTCOUNT