diff --git a/cas_wrapper.py b/cas_wrapper.py
index f58f303..8533dc9 100644
--- a/cas_wrapper.py
+++ b/cas_wrapper.py
@@ -54,7 +54,11 @@ class CasWrapper:
                     '-a',
                     f'{key}={value}',
                 ]
-        result_of_execution = command()
+        with local.env(
+                CAS_API_KEY=self._cas_api_key,
+                SIGNER_ID=self._cas_signer_id
+        ):
+            result_of_execution = command()
         return json.loads(result_of_execution)['hash']
 
     def authenticate(
@@ -76,8 +80,16 @@ class CasWrapper:
             'json',
         ]
         try:
-            result_of_execution = command()
+            with local.env(
+                    CAS_API_KEY=self._cas_api_key,
+                    SIGNER_ID=self._cas_signer_id
+            ):
+                result_of_execution = command()
         except ProcessExecutionError:
-            # in case if commit is untrusted
-            result_of_execution = command(retcode=1)
+            with local.env(
+                    CAS_API_KEY=self._cas_api_key,
+                    SIGNER_ID=self._cas_signer_id
+            ):
+                # in case if commit is untrusted
+                result_of_execution = command(retcode=1)
         return not bool(json.loads(result_of_execution)['status'])