diff --git a/pyproject.toml b/pyproject.toml
index 0e2d9ab..0575425 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,13 +4,13 @@ build-backend = "hatchling.build"
 
 [project]
 name = "synapse-invite-checker"
-description = 'Synapse module to handle TIM contact management and invite permissions'
+description = 'Synapse module to invite permissions'
 readme = "README.md"
 requires-python = ">=3.11"
 license = "AGPL-3.0-only"
 keywords = []
 authors = [
-  { name = "Nicolas Werner", email = "n.werner@famedly.com" },
+  { name = "Nils Büchner", email = "n.buechner@ubuntu.com" },
 ]
 classifiers = [
   "Development Status :: 4 - Beta",
@@ -21,9 +21,7 @@ classifiers = [
   "Programming Language :: Python :: Implementation :: PyPy",
 ]
 dependencies = [
-  "twisted",
-  "cachetools",
-  "asyncache",
+  "matrix-synapase"
 ]
 version = "0.2.0"
 
@@ -31,49 +29,3 @@ version = "0.2.0"
 Documentation = "https://github.com/famedly/synapse-invite-checker#synapse-invite-checker"
 Issues = "https://github.com/famedly/synapse-invite-checker/-/issues"
 Source = "https://github.com/famedly/synapse-invite-checker/"
-
-[tool.hatch.envs.default]
-dependencies = [
-  "black",
-  "pytest",
-  "pytest-cov",
-  "mock",
-  "matrix-synapse" # we don't depend on synapse directly to prevent pip from pulling the wrong synapse, when we just want to install the module
-]
-[tool.hatch.envs.default.scripts]
-cov = "pytest --cov-report=term-missing --cov-config=pyproject.toml --cov=synapse_invite_checker --cov=tests"
-format = "black ."
-# For CI use
-head-cov = "pytest --cov-report=lcov:../head.lcov --cov-config=pyproject.toml --cov=synapse_invite_checker --cov=tests"
-base-cov = "pytest --cov-report=lcov:../base.lcov --cov-config=pyproject.toml --cov=synapse_invite_checker --cov=tests"
-
-[tool.hatch.envs.ci.scripts]
-format = "black --check ."
-
-[tool.coverage.run]
-branch = true
-parallel = true
-omit = ["tests/*"]
-
-[tool.ruff]
-target-version = "py311"
-
-[tool.ruff.lint]
-ignore = [
-  "FBT001",
-  "FBT002",
-  "TRY002",
-  "TRY003",
-  "PLW0603",
-  "N802"
-]
-
-[tool.ruff.per-file-ignores]
-"tests/*" = ["RUF012", "S101", "PLR2004", "N803", "SLF001", "S105"]
-
-[tool.coverage.report]
-exclude_lines = [
-  "no cov",
-  "if __name__ == .__main__.:",
-  "if TYPE_CHECKING:",
-]
diff --git a/synapse_invite_checker/invite_checker.py b/synapse_invite_checker/invite_checker.py
index be8b69c..27eacbd 100644
--- a/synapse_invite_checker/invite_checker.py
+++ b/synapse_invite_checker/invite_checker.py
@@ -1,7 +1,7 @@
 import treq
 import json
+import time
 from twisted.internet.defer import inlineCallbacks, returnValue
-from cachetools import TTLCache
 from synapse.module_api import ModuleApi, errors
 from synapse.types import UserID
 import logging
@@ -28,9 +28,9 @@ class InviteChecker:
         self.use_allowlist = self.config.use_allowlist
         self.use_blocklist = self.config.use_blocklist
 
-        # Cache for allowlist/blocklist (TTL = 60 seconds)
-        self.cache = TTLCache(maxsize=1, ttl=60)
-
+        # Cache for allowlist/blocklist
+        self.cache_expiry_time = 60  # Cache expiry in seconds
+        self.cache_timestamp = 0  # Timestamp of when the cache was last updated
         self.blocklist = set()
         self.allowlist = set()
         self.allow_all_invites_on_error = False  # Flag to allow all invites if the JSON fetch fails
@@ -62,7 +62,6 @@ class InviteChecker:
             logger.error(f"Error while fetching JSON: {str(e)}")
             returnValue(None)
 
-
     @inlineCallbacks
     def update_blocklist_allowlist(self):
         """Fetch and update the blocklist and allowlist from the URLs."""
@@ -77,8 +76,8 @@ class InviteChecker:
             self.blocklist = set(json_data.get('blocklist', []))
             self.allowlist = set(json_data.get('allowlist', []))
 
-            # Cache the data
-            self.cache['blocklist_allowlist'] = (self.blocklist, self.allowlist)
+            # Update cache timestamp
+            self.cache_timestamp = time.time()
             logger.info(f"Updated allowlist: {self.allowlist}")
             logger.info(f"Updated blocklist: {self.blocklist}")
         else:
@@ -89,15 +88,17 @@ class InviteChecker:
     @inlineCallbacks
     def get_blocklist_allowlist(self):
         """Return cached blocklist/allowlist or fetch new data if cache is expired."""
+        current_time = time.time()
+        
+        # Check if cache is expired
+        if current_time - self.cache_timestamp > self.cache_expiry_time:
+            yield self.update_blocklist_allowlist()
+
         if self.allow_all_invites_on_error:
             logger.info("Skipping allowlist/blocklist checks because of previous JSON fetch failure.")
             returnValue((set(), set()))  # Return empty sets to indicate no checks should be applied
 
-        try:
-            returnValue(self.cache['blocklist_allowlist'])
-        except KeyError:
-            yield self.update_blocklist_allowlist()
-            returnValue(self.cache['blocklist_allowlist'])
+        returnValue((self.blocklist, self.allowlist))
 
     @inlineCallbacks
     def user_may_invite(self, inviter: str, invitee: str, room_id: str):
@@ -115,14 +116,14 @@ class InviteChecker:
 
         # allowlist check (if enabled)
         if self.use_allowlist:
-            logger.info(f"allowlist enabled. Checking domain: {inviter_domain}")
+            logger.info(f"Allowlist enabled. Checking domain: {inviter_domain}")
             if inviter_domain in allowlist:
                 logger.info(f"Invite allowed: {inviter_domain} is in the allowlist")
                 returnValue("NOT_SPAM")  # Allow if the domain is in the allowlist
 
         # blocklist check (if enabled)
         if self.use_blocklist:
-            logger.info(f"blocklist enabled. Checking domain: {inviter_domain}")
+            logger.info(f"Blocklist enabled. Checking domain: {inviter_domain}")
             if inviter_domain in blocklist:
                 logger.info(f"Invite blocked: {inviter_domain} is in the blocklist")
                 returnValue(errors.Codes.FORBIDDEN)  # Deny if the domain is in the blocklist