diff --git a/sdk/cognitivelanguage/azure-ai-language-conversations/setup.py b/sdk/cognitivelanguage/azure-ai-language-conversations/setup.py
index <HASH>..<HASH> 100644
--- a/sdk/cognitivelanguage/azure-ai-language-conversations/setup.py
+++ b/sdk/cognitivelanguage/azure-ai-language-conversations/setup.py
@@ -74,6 +74,7 @@ setup(
     },
     install_requires=[
         "azure-core<2.0.0,>=1.24.0",
+        "isodate>=0.6.0",
     ],
     project_urls={
         'Bug Reports': 'https://github.com/Azure/azure-sdk-for-python/issues',
add dependency on isodate since we removed msrest (#<I>)