diff --git a/prowler/lib/outputs/html.py b/prowler/lib/outputs/html.py
index 820681b0..72ea3dd8 100644
--- a/prowler/lib/outputs/html.py
+++ b/prowler/lib/outputs/html.py
@@ -407,7 +407,7 @@ def get_azure_html_assessment_summary(audit_info):
         if isinstance(audit_info, Azure_Audit_Info):
             printed_subscriptions = []
             for key, value in audit_info.identity.subscriptions.items():
-                intermediate = key + " : " + value
+                intermediate = f"{key} : {value}"
                 printed_subscriptions.append(intermediate)
 
             # check if identity is str(coming from SP) or dict(coming from browser or)
diff --git a/prowler/lib/outputs/slack.py b/prowler/lib/outputs/slack.py
index 1c8a8ad6..55720f86 100644
--- a/prowler/lib/outputs/slack.py
+++ b/prowler/lib/outputs/slack.py
@@ -13,7 +13,7 @@ def send_slack_message(token, channel, stats, provider, audit_info):
         response = client.chat_postMessage(
             username="Prowler",
             icon_url=square_logo_img,
-            channel="#" + channel,
+            channel=f"#{channel}",
             blocks=create_message_blocks(identity, logo, stats),
         )
         return response
@@ -35,7 +35,7 @@ def create_message_identity(provider, audit_info):
         elif provider == "azure":
             printed_subscriptions = []
             for key, value in audit_info.identity.subscriptions.items():
-                intermediate = "- *" + key + ": " + value + "*\n"
+                intermediate = f"- *{key}: {value}*\n"
                 printed_subscriptions.append(intermediate)
             identity = f"Azure Subscriptions:\n{''.join(printed_subscriptions)}"
             logo = azure_logo
diff --git a/prowler/providers/aws/services/apigateway/apigateway_restapi_authorizers_enabled/apigateway_restapi_authorizers_enabled.py b/prowler/providers/aws/services/apigateway/apigateway_restapi_authorizers_enabled/apigateway_restapi_authorizers_enabled.py
index b1b1fd05..70cabcd3 100644
--- a/prowler/providers/aws/services/apigateway/apigateway_restapi_authorizers_enabled/apigateway_restapi_authorizers_enabled.py
+++ b/prowler/providers/aws/services/apigateway/apigateway_restapi_authorizers_enabled/apigateway_restapi_authorizers_enabled.py
@@ -35,7 +35,7 @@ class apigateway_restapi_authorizers_enabled(Check):
                             if authorization_method == "NONE":
                                 all_methods_authorized = False
                                 unauthorized_method = (
-                                    resource.path + " -> " + http_method
+                                    f"{resource.path} -> {http_method}"
                                 )
                                 resource_paths_with_unathorized_methods.append(
                                     unauthorized_method
diff --git a/prowler/providers/common/audit_info.py b/prowler/providers/common/audit_info.py
index 39a7f0ce..421ab272 100644
--- a/prowler/providers/common/audit_info.py
+++ b/prowler/providers/common/audit_info.py
@@ -63,7 +63,7 @@ GCP Account: {Fore.YELLOW}[{profile}]{Style.RESET_ALL}  GCP Project IDs: {Fore.Y
     def print_azure_credentials(self, audit_info: Azure_Audit_Info):
         printed_subscriptions = []
         for key, value in audit_info.identity.subscriptions.items():
-            intermediate = key + " : " + value
+            intermediate = f"{key} : {value}"
             printed_subscriptions.append(intermediate)
         report = f"""
 This report is being generated using the identity below:
diff --git a/tests/providers/common/common_outputs_test.py b/tests/providers/common/common_outputs_test.py
index d2d033b6..f0ccd388 100644
--- a/tests/providers/common/common_outputs_test.py
+++ b/tests/providers/common/common_outputs_test.py
@@ -281,7 +281,7 @@ class Test_Common_Output_Options:
         }
         printed_subscriptions = []
         for key, value in audit_info.identity.subscriptions.items():
-            intermediate = key + " : " + value
+            intermediate = f"{key} : {value}"
             printed_subscriptions.append(intermediate)
         assert (
             get_assessment_summary(audit_info)