diff --git a/ct/stirling-pdf.sh b/ct/stirling-pdf.sh
index 91aa7bae9..fd89aba99 100644
--- a/ct/stirling-pdf.sh
+++ b/ct/stirling-pdf.sh
@@ -39,6 +39,7 @@ function update_script() {
   cd Stirling-PDF-$RELEASE
   chmod +x ./gradlew
   $STD ./gradlew build
+  rm -rf /opt/Stirling-PDF/Stirling-PDF-*.jar
   cp -r ./build/libs/Stirling-PDF-*.jar /opt/Stirling-PDF/
   cp -r scripts /opt/Stirling-PDF/
   cd ~