diff --git a/build/Dockerfile.alpine b/build/Dockerfile.alpine
index cd50c5c..57caa70 100644
--- a/build/Dockerfile.alpine
+++ b/build/Dockerfile.alpine
@@ -23,7 +23,7 @@ RUN printf '%s\n' 'https://dl-cdn.alpinelinux.org/alpine/edge/main/' \
     && apk update \
     && apk upgrade \
     && apk add --no-cache \
-        bash bash-completion ncurses \
+        bash bash-completion ncurses at \
         nginx \
         mariadb mariadb-client \
         ca-certificates acl \
diff --git a/build/run/docker-entrypoint/init.d/50-cron.sh b/build/run/docker-entrypoint/init.d/50-cron.sh
index 0ed133e..ac2af1f 100755
--- a/build/run/docker-entrypoint/init.d/50-cron.sh
+++ b/build/run/docker-entrypoint/init.d/50-cron.sh
@@ -1,24 +1,24 @@
 #!/usr/bin/env bash
 
+# Start at daemon
+atd
+
+# Roundcube cleanup (daily)
+while true
+do
+    at midnight -f /usr/share/webapps/roundcube/bin/cleandb.sh
+done &
+
 # Update Postscreen Whitelists (daily)
 while true
 do
-    sleep 1d
-    /usr/local/bin/postwhite/postwhite
+    at midnight -f /usr/local/bin/postwhite/postwhite
 done &
 
 # Update Yahoo! IPs for Postscreen Whitelists (weekly)
 while true
 do
-    sleep 7d
-    /usr/local/bin/postwhite/scrape_yahoo
-done &
-
-# Roundcube cleanup (daily)
-while true
-do
-    sleep 1d
-    /usr/share/webapps/roundcube/bin/cleandb.sh
+    at midnight sunday -f /usr/local/bin/postwhite/scrape_yahoo
 done &
 
 # # Refresh ssl keys daily