diff --git a/pom.xml b/pom.xml
index c4bc871..2b64538 100644
--- a/pom.xml
+++ b/pom.xml
@@ -318,7 +318,7 @@
     <dependency>
       <groupId>org.apache.pdfbox</groupId>
       <artifactId>pdfbox</artifactId>
-      <version>3.0.2</version>
+      <version>3.0.3</version>
     </dependency>
     <dependency>
       <groupId>com.github.jai-imageio</groupId>
diff --git a/project.clj b/project.clj
index 85ed2d5..75d41be 100644
--- a/project.clj
+++ b/project.clj
@@ -17,7 +17,7 @@
                          [io.netty/netty-codec-http "4.1.60.Final"] ; fixes CVE-2021-21295
                          [com.typesafe.akka/akka-actor_2.12 "2.5.16"]
                          [io.undertow/undertow-core "2.3.5.Final"]
-                         [org.apache.pdfbox/pdfbox "3.0.2"]]
+                         [org.apache.pdfbox/pdfbox "3.0.3"]]
 
   :dependencies [[org.clojure/clojure "1.11.2"]
                  [com.amazonaws/aws-java-sdk-s3 "1.12.740"]
diff --git a/src/liiteri/preview/preview_generator.clj b/src/liiteri/preview/preview_generator.clj
index 376fdba..08ae1f3 100644
--- a/src/liiteri/preview/preview_generator.clj
+++ b/src/liiteri/preview/preview_generator.clj
@@ -6,7 +6,7 @@
             [liiteri.files.file-store :as file-store]
             [liiteri.preview.interface :as interface]
             [liiteri.preview.pdf :as pdf])
-  (:import (java.util.concurrent Executors TimeUnit ScheduledFuture FutureTask)))
+  (:import (java.util.concurrent Executors TimeUnit ScheduledFuture)))
 
 (def content-types-to-process (concat pdf/content-types))
 
@@ -24,19 +24,7 @@
                                 (count data-as-byte-array)
                                 conn))
 
-(defn with-timeout
-  ([f ms]
-   (let [task (FutureTask. f)
-         thread (Thread. task)]
-     (try
-       (.start thread)
-       (.get task ms TimeUnit/MILLISECONDS)
-       (catch Exception e
-         (.cancel task true)
-         (.stop thread)
-         (throw e))))))
-
-(defn generate-file-previews [config conn storage-engine file]
+(defn generate-file-previews [config conn storage-engine file timeout-scheduler]
   (let [start-time (System/currentTimeMillis)
         {file-key :key
          filename :filename
@@ -45,10 +33,14 @@
       (log/info (format "Generating previews for '%s' with key '%s', uploaded on %s ..." filename file-key uploaded))
       (with-open [input-stream (file-store/get-file storage-engine file-key)]
         (let [preview-timeout-ms    (get-in config [:preview-generator :preview-timeout-ms] 45000)
-              [page-count previews] (with-timeout #(interface/generate-previews-for-file storage-engine
+              [page-count previews] (.invokeAny timeout-scheduler [#(try
+                                                                      (interface/generate-previews-for-file storage-engine
                                                                           file
                                                                           input-stream
-                                                                          config) preview-timeout-ms)]
+                                                                          config)
+                                                                      (catch Throwable t
+                                                                        (log/error t "Error in generating previews task")
+                                                                        (throw t)))] preview-timeout-ms TimeUnit/MILLISECONDS)]
           (doseq [[page-index preview-as-byte-array] (map-indexed vector previews)]
             (let [preview-key      (str file-key "." page-index)
                   preview-filename preview-key]
@@ -80,14 +72,14 @@
         (metadata-store/set-file-page-count-and-preview-status! file-key nil "error" conn)
         false))))
 
-(defn- generate-next-preview [config db storage-engine]
+(defn- generate-next-preview [config db storage-engine timeout-scheduler]
   (try
     (jdbc/with-db-transaction [tx db]
       (let [conn {:connection tx}]
         (if-let [file (metadata-store/get-file-without-preview conn content-types-to-process)]
           (do
             (reset! were-unprocessed-files-found-on-last-run true)
-            (generate-file-previews config conn storage-engine file))
+            (generate-file-previews config conn storage-engine file timeout-scheduler))
           (do
             (when @were-unprocessed-files-found-on-last-run
               (log/info "Preview generation seems to be finished (or errored)."))
@@ -97,12 +89,12 @@
       (log/error e "Failed to generate preview for the next file")
       false)))
 
-(defn- generate-previews [config db storage-engine]
+(defn- generate-previews [config db storage-engine timeout-scheduler]
   (try (loop []
-         (when (generate-next-preview config db storage-engine)
+         (when (generate-next-preview config db storage-engine timeout-scheduler)
            (recur)))
        (catch Throwable t
-         (println "Unexpected throwable!")
+         (log/error t "Unexpected throwable!")
          (.printStackTrace t))))
 
 (defprotocol Generator
@@ -115,7 +107,8 @@
     (log/info "Starting document preview generation process...")
     (let [poll-interval            (get-in config [:preview-generator :poll-interval-seconds])
           scheduler                (Executors/newScheduledThreadPool 1)
-          preview-generator        #(generate-previews config db storage-engine)
+          timeout-scheduler        (Executors/newCachedThreadPool)
+          preview-generator        #(generate-previews config db storage-engine timeout-scheduler)
           time-unit                TimeUnit/SECONDS
           preview-generator-future (.scheduleAtFixedRate scheduler preview-generator 0 poll-interval time-unit)]
       (log/info (str "Started document preview generation process, restarting at " poll-interval " " time-unit " intervals."))
diff --git a/src/liiteri/virus_scan.clj b/src/liiteri/virus_scan.clj
index 17832ba..22349b3 100644
--- a/src/liiteri/virus_scan.clj
+++ b/src/liiteri/virus_scan.clj
@@ -1,17 +1,14 @@
 (ns liiteri.virus-scan
-  (:require [chime :as c]
-            [clojure.core.async :as a]
-            [clojure.java.jdbc :as jdbc]
+  (:require [clojure.java.jdbc :as jdbc]
             [clojure.string :as string]
-            [clj-time.core :as t]
-            [clj-time.periodic :as p]
             [com.stuartsierra.component :as component]
             [liiteri.db.file-metadata-store :as metadata-store]
             [liiteri.files.file-store :as file-store]
             [liiteri.sqs-client :refer [get-sqs-client]]
             [taoensso.timbre :as log]
             [cheshire.core :as json])
-  (:import [com.amazonaws.services.sqs.model ReceiveMessageRequest]))
+  (:import [com.amazonaws.services.sqs.model ReceiveMessageRequest]
+           [java.util.concurrent Executors TimeUnit ScheduledFuture]))
 
 (defn- log-virus-scan-result [file-key filename content-type status elapsed-time]
   (let [status-str (string/upper-case (name status))]
@@ -28,6 +25,7 @@
      (let [messages (-> (.receiveMessage sqs-client (-> (ReceiveMessageRequest. result-queue-url)
                                                         (.withWaitTimeSeconds (int 1)))) ; wait time of 1 second is to enable long polling which means we get answers from all sqs servers
                         (.getMessages))]
+       (log/info (str "Received " (.size messages) " virus scan results"))
        (doseq [message messages]
          (try
            (let [message (json/parse-string (.getBody message) true)
@@ -77,24 +75,23 @@
           result-queue-url (-> (.getQueueUrl sqs-poll-results-client result-queue-name)
                                 (.getQueueUrl))
           poll-interval (get-in config [:bucketav :poll-interval-seconds])
-          times         (c/chime-ch (p/periodic-seq (t/now) (t/seconds poll-interval))
-                                    {:ch (a/chan (a/sliding-buffer 1))})
-          s3-bucket (get-in config [:file-store :s3 :bucket])]
-      (log/info "Starting virus scan results polling")
-      (a/go-loop []
-        (when-let [_ (a/<! times)]
-          (while (< 0 (poll-scan-results sqs-poll-results-client result-queue-url db storage-engine config)))
-          (recur)))
-      (assoc this :chan times
+          s3-bucket (get-in config [:file-store :s3 :bucket])
+
+          scheduler (Executors/newScheduledThreadPool 1)
+          virus-scan #(while (< 0 (poll-scan-results sqs-poll-results-client result-queue-url db storage-engine config)))
+          time-unit TimeUnit/SECONDS
+          virus-scan-future (.scheduleAtFixedRate scheduler virus-scan 0 poll-interval time-unit)]
+      (log/info (str "Started virus scan results polling process, restarting at " poll-interval " " time-unit " intervals."))
+      (assoc this :virus-scan-future virus-scan-future
                   :request-queue-url request-queue-url
                   :sqs-request-scan-client sqs-request-scan-client
                   :s3-bucket s3-bucket)))
 
   (stop [this]
-    (when-let [chan (:chan this)]
-      (a/close! chan))
+    (when-let [^ScheduledFuture virus-scan-future (:virus-scan-future this)]
+      (.cancel virus-scan-future true))
     (log/info "Stopped virus scan results polling")
-    (assoc this :chan nil
+    (assoc this :virus-scan-future nil
                 :request-queue-url nil
                 :sqs-request-scan-client nil
                 :s3-bucket nil))
diff --git a/test/liiteri/preview/preview_generator_test.clj b/test/liiteri/preview/preview_generator_test.clj
index 4a5ccfe..3be8236 100644
--- a/test/liiteri/preview/preview_generator_test.clj
+++ b/test/liiteri/preview/preview_generator_test.clj
@@ -8,8 +8,10 @@
             [liiteri.test-utils :as u]
             [liiteri.preview.preview-generator :as preview-generator]
             [com.stuartsierra.component :as component]
-            [clj-time.core :as t])
-  (:import [java.sql Timestamp]))
+            [clj-time.core :as t]
+            [taoensso.timbre :as log])
+  (:import [java.sql Timestamp]
+           (java.util.concurrent Executors)))
 
 (def system (atom (system/new-system {})))
 
@@ -65,7 +67,7 @@
         (file-store/create-file store file-object filename)
         (metadata-store/set-virus-scan-status! filename "done" conn)
         (metadata-store/finalize-files [filename] origin-system origin-reference conn)
-        (preview-generator/generate-file-previews (:config @system) conn store file-spec)
+        (preview-generator/generate-file-previews (:config @system) conn store file-spec (Executors/newCachedThreadPool))
 
         (let [file-metadata-after-preview (first (metadata-store/get-normalized-metadata! [filename] conn))
               generated-previews          (vec (metadata-store/get-previews filename conn))]
@@ -93,7 +95,7 @@
         (file-store/create-file store file-object filename)
         (metadata-store/set-virus-scan-status! filename "done" conn)
         (metadata-store/finalize-files [filename] origin-system origin-reference conn)
-        (preview-generator/generate-file-previews (:config @system) conn store file-spec)
+        (preview-generator/generate-file-previews (:config @system) conn store file-spec (Executors/newCachedThreadPool))
 
         (let [file-metadata-after-preview (first (metadata-store/get-normalized-metadata! [filename] conn))
               generated-previews          (vec (metadata-store/get-previews filename conn))]
@@ -119,7 +121,7 @@
         (file-store/create-file store file-object filename)
         (metadata-store/set-virus-scan-status! filename "done" conn)
         (metadata-store/finalize-files [filename] origin-system origin-reference conn)
-        (preview-generator/generate-file-previews (:config @system) conn store file-spec)
+        (preview-generator/generate-file-previews (:config @system) conn store file-spec (Executors/newCachedThreadPool))
 
         (file-store/delete-file-and-metadata (:key file-spec) "preview-generator-test" store conn false)