diff --git a/Dockerfile b/Dockerfile
index f2a58c12..f513ee51 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -60,7 +60,7 @@ RUN easy-add --var os=${TARGETOS} --var arch=${TARGETARCH}${TARGETVARIANT} \
  --var version=0.1.1 --var app=maven-metadata-release --file {{.app}} \
  --from https://github.com/itzg/{{.app}}/releases/download/{{.version}}/{{.app}}_{{.version}}_{{.os}}_{{.arch}}.tar.gz
 
-ARG MC_HELPER_VERSION=1.4.0
+ARG MC_HELPER_VERSION=1.5.2
 RUN curl -fsSL https://github.com/itzg/mc-image-helper/releases/download/v${MC_HELPER_VERSION}/mc-image-helper-${MC_HELPER_VERSION}.tgz \
     | tar -C /usr/share -zxf - \
     && ln -s /usr/share/mc-image-helper-${MC_HELPER_VERSION}/bin/mc-image-helper /usr/bin
diff --git a/start-deployFabric b/start-deployFabric
index 97fa7be0..5fce8d46 100755
--- a/start-deployFabric
+++ b/start-deployFabric
@@ -58,7 +58,7 @@ if [[ ! -e ${SERVER} ]]; then
     exit 10
   fi
 
-  mv fabric-server-launch.jar ${SERVER}
+  mv fabric-server-launch.jar "${SERVER}"
 fi
 
-exec ${SCRIPTS:-/}start-setupWorld $@
+exec ${SCRIPTS:-/}start-setupWorld "$@"
diff --git a/start-setupModpack b/start-setupModpack
index 92cb9811..56bea8ed 100755
--- a/start-setupModpack
+++ b/start-setupModpack
@@ -2,6 +2,7 @@
 
 set -e -o pipefail
 
+# shellcheck source=start-utils
 . ${SCRIPTS:-/}start-utils
 if isDebugging; then
   set -x
@@ -71,25 +72,11 @@ if [[ "$MODS" ]]; then
 
   for i in ${MODS//,/ }
   do
-    if isURL $i; then
+    if isURL "$i"; then
       log "Downloading mod/plugin $i ..."
-      if isValidFileURL jar "$i"; then
-        if ! curl -fsSL -o "${out_dir}/$(getFilenameFromUrl "${i}")" "${i}"; then
-          log "ERROR: failed to download from $i into $out_dir"
-          exit 2
-        fi
-      else
-        effective_url=$(resolveEffectiveUrl "$i")
-        if isValidFileURL jar "${effective_url}"; then
-          out_file=$(getFilenameFromUrl "${effective_url}")
-          if ! curl -fsSL -o "${out_dir}/$out_file" "${effective_url}"; then
-            log "ERROR: failed to download from $i into $out_dir"
-            exit 2
-          fi
-        else
-          log "ERROR: $effective_url resolved from $i is not a valid jar URL"
-          exit 2
-        fi
+      if ! get -o "${out_dir}" "$i"; then
+        log "ERROR: failed to download from $i into $out_dir"
+        exit 2
       fi
     elif [[ -f "$i" && "$i" =~ .*\.jar ]]; then
       log "Copying plugin located at $i ..."