diff --git a/src/O4_DSF_Utils.py b/src/O4_DSF_Utils.py
index b0fdf003..c81f4ef6 100755
--- a/src/O4_DSF_Utils.py
+++ b/src/O4_DSF_Utils.py
@@ -1,21 +1,22 @@
+import array
+import hashlib
+import io
+import numpy
 import os
 import pickle
 import shutil
-import io
-from math import floor, ceil
-import array
-import numpy
-from PIL import Image, ImageDraw
-from collections import defaultdict
 import struct
-import hashlib
+from collections import defaultdict
+from math import ceil, floor
+from PIL import Image, ImageDraw
+import subprocess
+import O4_Bathymetry as BATHY
 import O4_File_Names as FNAMES
 import O4_Geo_Utils as GEO
 import O4_Mask_Utils as MASK
-import O4_UI_Utils as UI
-import O4_Overlay_Utils as OVL
 import O4_Mesh_Utils as MESH
-import O4_Bathymetry as BATHY
+import O4_Overlay_Utils as OVL
+import O4_UI_Utils as UI
 
 quad_init_level = 3
 quad_capacity_high = 50000
@@ -397,9 +398,7 @@ def extract_elevation_and_bathymetry_data(lat, lon):
     if dsfid == "7z":
         UI.vprint(2, "     The original DSF is a 7z archive, uncompressing...")
         os.replace(tmp_file, tmp_file + ".7z")
-        os.system(
-            OVL.unzip_cmd + " e -o" + FNAMES.Tmp_dir + ' "' + tmp_file + '.7z"'
-        )
+        subprocess.run([OVL.unzip_cmd, "e", f"-o{FNAMES.Tmp_dir}", f"{tmp_file}.7z"])
         os.remove(tmp_file + '.7z')
     file_len = os.path.getsize(tmp_file)
     f = open(tmp_file, "rb")
diff --git a/src/O4_OSM_Utils.py b/src/O4_OSM_Utils.py
index 8baee054..7aab5770 100755
--- a/src/O4_OSM_Utils.py
+++ b/src/O4_OSM_Utils.py
@@ -10,12 +10,12 @@
 import O4_File_Names as FNAMES
 
 overpass_servers = {
-    "DE": "http://overpass-api.de/api/interpreter",
-    "FR": "http://api.openstreetmap.fr/oapi/interpreter",
+    "DE": "https://overpass-api.de/api/interpreter",
     "KU": "https://overpass.kumi.systems/api/interpreter",
-    "RU": "http://overpass.osm.rambler.ru/cgi/interpreter",
+    "RU": "https://overpass.openstreetmap.ru/api/interpreter",
 }
-overpass_server_choice = "DE"
+# KU server does not rate limit as of 2024-07-08
+overpass_server_choice = "KU"
 max_osm_tentatives = 8
 
 ################################################################################
diff --git a/src/O4_Overlay_Utils.py b/src/O4_Overlay_Utils.py
index 345041fe..7eddcb6e 100644
--- a/src/O4_Overlay_Utils.py
+++ b/src/O4_Overlay_Utils.py
@@ -16,13 +16,13 @@
 custom_overlay_src_alternate = ""
 
 if "dar" in sys.platform:
-    unzip_cmd = "7z "
+    unzip_cmd = "7z"
     dsftool_cmd = os.path.join(FNAMES.Utils_dir, "mac", "DSFTool ")
 elif "win" in sys.platform:
-    unzip_cmd = os.path.join(FNAMES.Utils_dir, "win", "7z.exe ")
+    unzip_cmd = os.path.join(FNAMES.Utils_dir, "win", "7z.exe")
     dsftool_cmd = os.path.join(FNAMES.Utils_dir, "win", "DSFTool.exe ")
 else:
-    unzip_cmd = "7z "
+    unzip_cmd = "7z"
     dsftool_cmd = os.path.join(FNAMES.Utils_dir, "lin", "DSFTool ")
 
 ################################################################################
@@ -75,14 +75,7 @@ def build_overlay(lat, lon):
     if dsfid == "7z":
         UI.vprint(1, "-> The original DSF is a 7z archive, uncompressing...")
         os.replace(file_to_sniff_loc, file_to_sniff_loc + ".7z")
-        os.system(
-            unzip_cmd
-            + " e -o"
-            + FNAMES.Tmp_dir
-            + ' "'
-            + file_to_sniff_loc
-            + '.7z"'
-        )
+        subprocess.run([unzip_cmd, "e", f"-o{FNAMES.Tmp_dir}", f"{file_to_sniff_loc}.7z"])
         os.remove(file_to_sniff_loc + ".7z")
     UI.vprint(1, "-> Converting the copy to text format")
     dsfconvertcmd = [
diff --git a/src/O4_Version.py b/src/O4_Version.py
index d27e057f..dbed5974 100755
--- a/src/O4_Version.py
+++ b/src/O4_Version.py
@@ -1 +1 @@
-version='1.40.06'
+version='1.40.07'