diff --git a/src/main/python/ddadevops/infrastructure/infrastructure.py b/src/main/python/ddadevops/infrastructure/infrastructure.py
index ed80da0..fda7c90 100644
--- a/src/main/python/ddadevops/infrastructure/infrastructure.py
+++ b/src/main/python/ddadevops/infrastructure/infrastructure.py
@@ -248,15 +248,15 @@ class ArtifactDeploymentApi:
         )
 
     def calculate_sha256(self, path: Path):
-        sum = f"{path}.sha256"
-        self.execution_api(
-            f"sha256sum {path} > {sum}",
+        shasum = f"{path}.sha256"
+        self.execution_api.execute(
+            f"sha256sum {path} > {shasum}",
         )
-        return sum
+        return shasum
 
     def calculate_sha512(self, path: Path):
-        sum = f"{path}.sha512"
-        self.execution_api(
-            f"sha512sum {path} > {sum}",
+        shasum = f"{path}.sha512"
+        self.execution_api.execute(
+            f"sha512sum {path} > {shasum}",
         )
-        return sum
+        return shasum