diff --git a/pyproject.toml b/pyproject.toml
index 2a4e203..6f22b81 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,8 @@ dependencies = [
   "charset-normalizer",
   "openai",
   "azure-ai-documentintelligence",
-  "azure-identity"
+  "azure-identity",
+  "boto3>=1.36.6",
 ]
 
 [project.urls]
diff --git a/src/markitdown/_markitdown.py b/src/markitdown/_markitdown.py
index c6ab542..d130ffe 100644
--- a/src/markitdown/_markitdown.py
+++ b/src/markitdown/_markitdown.py
@@ -853,7 +853,9 @@ def convert(self, local_path, **kwargs) -> Union[None, DocumentConverterResult]:
 
                     if not llm_description:
                         try:
-                            alt_text = shape._element._nvXxPr.cNvPr.attrib.get("descr", "")
+                            alt_text = shape._element._nvXxPr.cNvPr.attrib.get(
+                                "descr", ""
+                            )
                         except Exception:
                             # Unable to get alt text
                             pass