diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7a72cc6..0380a14 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,43 +28,32 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         scala: [2.12.15]
-        java: [temurin@11]
+        java: [temurin@8]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
-      - name: Setup Java (temurin@11)
-        if: matrix.java == 'temurin@11'
-        uses: actions/setup-java@v2
+      - name: Setup Java (temurin@8)
+        if: matrix.java == 'temurin@8'
+        uses: actions/setup-java@v3
         with:
           distribution: temurin
-          java-version: 11
-
-      - name: Cache sbt
-        uses: actions/cache@v2
-        with:
-          path: |
-            ~/.sbt
-            ~/.ivy2/cache
-            ~/.coursier/cache/v1
-            ~/.cache/coursier/v1
-            ~/AppData/Local/Coursier/Cache/v1
-            ~/Library/Caches/Coursier/v1
-          key: ${{ runner.os }}-sbt-cache-v2-${{ hashFiles('**/*.sbt') }}-${{ hashFiles('project/build.properties') }}
+          java-version: 8
+          cache: sbt
 
       - name: Check that workflows are up to date
-        run: sbt ++${{ matrix.scala }} githubWorkflowCheck
+        run: sbt '++ ${{ matrix.scala }}' githubWorkflowCheck
 
-      - run: sbt ++${{ matrix.scala }} scripted
+      - run: sbt '++ ${{ matrix.scala }}' scripted
 
       - name: Compress target directories
         run: tar cf targets.tar target project/target
 
       - name: Upload target directories
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: target-${{ matrix.os }}-${{ matrix.scala }}-${{ matrix.java }}
           path: targets.tar
@@ -77,35 +66,24 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         scala: [2.12.15]
-        java: [temurin@11]
+        java: [temurin@8]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
-      - name: Setup Java (temurin@11)
-        if: matrix.java == 'temurin@11'
-        uses: actions/setup-java@v2
+      - name: Setup Java (temurin@8)
+        if: matrix.java == 'temurin@8'
+        uses: actions/setup-java@v3
         with:
           distribution: temurin
-          java-version: 11
-
-      - name: Cache sbt
-        uses: actions/cache@v2
-        with:
-          path: |
-            ~/.sbt
-            ~/.ivy2/cache
-            ~/.coursier/cache/v1
-            ~/.cache/coursier/v1
-            ~/AppData/Local/Coursier/Cache/v1
-            ~/Library/Caches/Coursier/v1
-          key: ${{ runner.os }}-sbt-cache-v2-${{ hashFiles('**/*.sbt') }}-${{ hashFiles('project/build.properties') }}
+          java-version: 8
+          cache: sbt
 
       - name: Download target directories (2.12.15)
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v3
         with:
           name: target-${{ matrix.os }}-2.12.15-${{ matrix.java }}
 
@@ -114,4 +92,4 @@ jobs:
           tar xf targets.tar
           rm targets.tar
 
-      - run: sbt ++${{ matrix.scala }} ci-release
+      - run: sbt ci-release
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
diff --git a/project/plugins.sbt b/project/plugins.sbt
index fd10c7e..90259df 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1,3 +1,3 @@
 libraryDependencies += "org.scala-sbt" %% "scripted-plugin" % sbtVersion.value
-addSbtPlugin("com.codecommit" % "sbt-github-actions" % "0.14.2")
+addSbtPlugin("com.github.sbt" % "sbt-github-actions" % "0.18.0")
 addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.5.10")