diff --git a/.devcontainer/configuration/configuration.py b/.devcontainer/configuration/configuration.py
index 9b44ed3e..0a415308 100644
--- a/.devcontainer/configuration/configuration.py
+++ b/.devcontainer/configuration/configuration.py
@@ -7,7 +7,7 @@
 # Read secret from file
 def _read_secret(secret_name, default=None):
     try:
-        f = open("/run/secrets/" + secret_name, encoding="utf-8")
+        f = open(f"/run/secrets/{secret_name}", encoding="utf-8")
     except OSError:
         return default
     else:
diff --git a/configuration/configuration.py b/configuration/configuration.py
index 8327db38..2cf46684 100644
--- a/configuration/configuration.py
+++ b/configuration/configuration.py
@@ -14,7 +14,7 @@
 # Read secret from file
 def _read_secret(secret_name, default=None):
     try:
-        f = open("/run/secrets/" + secret_name, encoding="utf-8")
+        f = open(f"/run/secrets/{secret_name}", encoding="utf-8")
     except OSError:
         return default
     else: