diff --git a/src/charm.py b/src/charm.py
index 9f96a35..e6f12c3 100755
--- a/src/charm.py
+++ b/src/charm.py
@@ -13,7 +13,6 @@
 """
 
 import logging
-import os
 import socket
 from pathlib import Path
 
@@ -258,13 +257,13 @@ def _refresh_git_ubuntu_source(self) -> bool:
 
         if https_proxy != "":
             logger.info("Using https proxy %s for git-ubuntu source refresh.", https_proxy)
-            os.environ["https_proxy"] = https_proxy
 
         # Run clone or pull of git-ubuntu source.
         if not usr.refresh_git_ubuntu_source(
             GIT_UBUNTU_SYSTEM_USER_USERNAME,
             GIT_UBUNTU_USER_HOME_DIR,
             GIT_UBUNTU_SOURCE_URL,
+            https_proxy,
         ):
             self.unit.status = ops.BlockedStatus("Failed to refresh git-ubuntu source.")
             return False
diff --git a/src/user_management.py b/src/user_management.py
index 89d4acc..4887e84 100644
--- a/src/user_management.py
+++ b/src/user_management.py
@@ -93,13 +93,16 @@ def setup_git_ubuntu_user_services_dir(user: str, home_dir: str) -> bool:
     return _mkdir_for_user_with_error_checking(services_dir, user)
 
 
-def refresh_git_ubuntu_source(user: str, home_dir: str, source_url: str) -> bool:
+def refresh_git_ubuntu_source(
+    user: str, home_dir: str, source_url: str, https_proxy: str = ""
+) -> bool:
     """Clone or update the git-ubuntu git repo in the home directory.
 
     Args:
         user: The user to run git clone as.
         home_dir: The home directory for the user.
         source_url: git-ubuntu's git repo url.
+        https_proxy: The https proxy URL if required.
 
     Returns:
         True if the clone succeeded, False otherwise.
@@ -122,15 +125,23 @@ def refresh_git_ubuntu_source(user: str, home_dir: str, source_url: str) -> bool
             return False
 
         # Run git pull to get up to date
-        if not _run_command_as_user(user, f"git -C {clone_dir.as_posix()} pull"):
+        pull_command = f"git -C {clone_dir.as_posix()} pull"
+        if https_proxy != "":
+            pull_command = f"https_proxy={https_proxy} {pull_command}"
+
+        if not _run_command_as_user(user, pull_command):
             logger.error("Failed to update existing git-ubuntu source.")
             return False
 
         return True
 
     # Clone the repository
+    clone_command = f"git clone {source_url} {clone_dir.as_posix()}"
+    if https_proxy != "":
+        clone_command = f"https_proxy={https_proxy} {clone_command}"
+
     logger.info("Cloning git-ubuntu source to %s", clone_dir.as_posix())
-    if not _run_command_as_user(user, f"git clone {source_url} {clone_dir.as_posix()}"):
+    if not _run_command_as_user(user, clone_command):
         logger.error("Failed to clone git-ubuntu source.")
         return False
 
diff --git a/tests/integration/test_charm.py b/tests/integration/test_charm.py
index b78fcfc..8689810 100644
--- a/tests/integration/test_charm.py
+++ b/tests/integration/test_charm.py
@@ -24,7 +24,7 @@ def test_service_status(app: str, juju: jubilant.Juju):
     """
     # Wait until machine is ready, then wait an extra 60 seconds for services to fully activate.
     juju.wait(jubilant.all_active)
-    sleep(60)
+    sleep(90)
 
     def get_services_dict(unit_name: str, juju: jubilant.Juju) -> dict[str, dict[str, bool | str]]:
         """Get a dictionary of running systemd services on the app's unit.