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 a3d46bb9..94a0c73c 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -7,7 +7,7 @@ addSbtPlugin("com.github.sbt"                    % "sbt-ghpages"              %
 addSbtPlugin("com.thoughtworks.sbt-api-mappings" % "sbt-api-mappings"         % "3.0.2")
 addSbtPlugin("com.github.sbt"                    % "sbt-site-paradox"         % "1.5.0")
 addSbtPlugin("com.github.sbt"                    % "sbt-native-packager"      % "1.9.16")
-addSbtPlugin("com.github.sbt"                    % "sbt-github-actions"       % "0.17.0")
+addSbtPlugin("com.github.sbt"                    % "sbt-github-actions"       % "0.18.0")
 addSbtPlugin("com.github.sbt"                    % "sbt-pgp"                  % "2.2.1")
 addSbtPlugin("com.github.sbt"                    % "sbt-release"              % "1.1.0")
 addSbtPlugin("ch.epfl.scala"                     % "sbt-scalafix"             % "0.11.1")