diff --git a/.github/workflows/clean.yml b/.github/workflows/clean.yml
index 547aaa43..bfc865d5 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 01158000..332930b9 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -18,7 +18,7 @@ addSbtPlugin("org.scalameta"         % "sbt-scalafmt"                       % "2
 addSbtPlugin("de.heikoseeberger"     % "sbt-header"                         % "5.10.0")
 addSbtPlugin("com.lightbend.paradox" % "sbt-paradox"                        % "0.10.5")
 addSbtPlugin("com.lightbend.paradox" % "sbt-paradox-lightbend-project-info" % "2.0.0")
-addSbtPlugin("com.github.sbt"        % "sbt-github-actions"                 % "0.16.0")
+addSbtPlugin("com.github.sbt"        % "sbt-github-actions"                 % "0.18.0")
 addSbtPlugin("com.github.sbt"        % "sbt-ci-release"                     % "1.5.12")
 
 libraryDependencies += "org.scala-sbt" %% "scripted-plugin" % sbtVersion.value