diff --git a/collect/cleanup/remove_envs.py b/collect/cleanup/remove_envs.py
index 3fd130a6..d19ea8de 100644
--- a/collect/cleanup/remove_envs.py
+++ b/collect/cleanup/remove_envs.py
@@ -69,7 +69,7 @@ def remove_environment(env_name, prefix):
     args = parser.parse_args()
 
     # Remove conda environments with a specific prefix
-    conda_source = "source " + os.path.join(args.conda_path, "etc/profile.d/conda.sh")
+    conda_source = ". " + os.path.join(args.conda_path, "etc/profile.d/conda.sh")
     check_env = conda_source + " && " + "conda env list"
     try:
         conda_envs = subprocess.run(check_env.split(" "), check=True, capture_output=True)
diff --git a/harness/context_manager.py b/harness/context_manager.py
index 923c98e9..b42847ee 100644
--- a/harness/context_manager.py
+++ b/harness/context_manager.py
@@ -281,7 +281,7 @@ def __enter__(self):
 
                     # Install dependencies
                     path_to_reqs = get_requirements(setup_ref_instance, self.testbed)
-                    cmd = f"source {path_activate} {env_name} && echo 'activate successful' && pip install -r {path_to_reqs}"
+                    cmd = f". {path_activate} {env_name} && echo 'activate successful' && pip install -r {path_to_reqs}"
                     logger_testbed.info(
                         f"[Testbed] Installing dependencies for {env_name}; Command: {cmd}"
                     )
@@ -326,7 +326,7 @@ def __enter__(self):
 
                 # Install additional packages if specified
                 if "pip_packages" in install:
-                    cmd = f"source {path_activate} {env_name} && pip install {install['pip_packages']}"
+                    cmd = f". {path_activate} {env_name} && pip install {install['pip_packages']}"
                     logger_testbed.info(
                         f"[Testbed] Installing pip packages for {env_name}; Command: {cmd}"
                     )
@@ -436,10 +436,7 @@ def __init__(
             )
         self.log_file = os.path.join(log_dir, log_file_name)
 
-        self.cmd_activate = (
-            f"source {os.path.join(self.conda_path, 'bin', 'activate')} "
-            + f"{self.venv} && echo 'activate successful'"
-        )
+        self.cmd_activate = f". {os.path.join(self.conda_path, 'bin', 'activate')} {self.venv} && echo 'activate successful'"
         self.timeout = timeout
 
         shellenv = os.environ.copy()
diff --git a/versioning/get_versions.py b/versioning/get_versions.py
index f10d6d78..24ba2906 100644
--- a/versioning/get_versions.py
+++ b/versioning/get_versions.py
@@ -140,8 +140,8 @@ def get_versions_from_build(data: Dict):
         data["save_path"],
     )
     # Activate conda environment and set installation command
-    cmd_activate = f"source {os.path.join(path_conda, 'bin/activate')}"
-    cmd_source = f"source {os.path.join(path_conda, 'etc/profile.d/conda.sh')}"
+    cmd_activate = f". {os.path.join(path_conda, 'bin/activate')}"
+    cmd_source = f". {os.path.join(path_conda, 'etc/profile.d/conda.sh')}"
     cmd_install = INSTALL_CMD[data_tasks[0]["repo"]]
 
     # Change directory to repo testbed