diff --git a/ModuleUpdate.py b/ModuleUpdate.py
index 3c2cc987..2a578aab 100644
--- a/ModuleUpdate.py
+++ b/ModuleUpdate.py
@@ -3,12 +3,20 @@ import sys
 import subprocess
 import pkg_resources
 
-requirements_files = ['requirements.txt']
+requirements_files = {'requirements.txt'}
+
 if sys.version_info < (3, 8, 6):
     raise RuntimeError("Incompatible Python Version. 3.8.7+ is supported.")
 
 update_ran = getattr(sys, "frozen", False)  # don't run update if environment is frozen/compiled
 
+if not update_ran:
+    for entry in os.scandir("worlds"):
+        if entry.is_dir():
+            req_file = os.path.join(entry.path, "requirements.txt")
+            if os.path.exists(req_file):
+                requirements_files.add(req_file)
+
 
 def update_command():
     for file in requirements_files:
diff --git a/WebHost.py b/WebHost.py
index 50022b0b..a3a25947 100644
--- a/WebHost.py
+++ b/WebHost.py
@@ -3,7 +3,7 @@ import multiprocessing
 import logging
 
 import ModuleUpdate
-ModuleUpdate.requirements_files.append(os.path.join("WebHostLib", "requirements.txt"))
+ModuleUpdate.requirements_files.add(os.path.join("WebHostLib", "requirements.txt"))
 ModuleUpdate.update()
 
 from WebHostLib import app as raw_app
diff --git a/requirements.txt b/requirements.txt
index 946f89ff..5b7e32d0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,10 +2,6 @@ colorama>=0.4.4
 websockets>=9.1
 PyYAML>=5.4.1
 fuzzywuzzy>=0.18.0
-bsdiff4>=1.2.1
 prompt_toolkit>=3.0.18
 appdirs>=1.4.4
-maseya-z3pr>=1.0.0rc1
-xxtea>=2.0.0.post0
-factorio-rcon-py>=1.2.1
 jinja2>=3.0.1
\ No newline at end of file
diff --git a/worlds/alttp/requirements.txt b/worlds/alttp/requirements.txt
new file mode 100644
index 00000000..83e890ae
--- /dev/null
+++ b/worlds/alttp/requirements.txt
@@ -0,0 +1,3 @@
+bsdiff4>=1.2.1
+maseya-z3pr>=1.0.0rc1
+xxtea>=2.0.0.post0
\ No newline at end of file
diff --git a/worlds/factorio/requirements.txt b/worlds/factorio/requirements.txt
new file mode 100644
index 00000000..0fe5b405
--- /dev/null
+++ b/worlds/factorio/requirements.txt
@@ -0,0 +1,2 @@
+kivy>=2.0.0
+factorio-rcon-py>=1.2.1
\ No newline at end of file