diff --git a/example_isort_formatting_plugin/pyproject.toml b/example_isort_formatting_plugin/pyproject.toml
index 25ce01747..1b0e68324 100644
--- a/example_isort_formatting_plugin/pyproject.toml
+++ b/example_isort_formatting_plugin/pyproject.toml
@@ -17,4 +17,4 @@ black = ">20.08b1"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]
-build-backend = "poetry.masonry.api"
+build-backend = "poetry.core.masonry.api"
diff --git a/example_isort_sorting_plugin/pyproject.toml b/example_isort_sorting_plugin/pyproject.toml
index cafcfcaaa..d82d1aa74 100644
--- a/example_isort_sorting_plugin/pyproject.toml
+++ b/example_isort_sorting_plugin/pyproject.toml
@@ -16,4 +16,4 @@ natsort = ">=7.1.1"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]
-build-backend = "poetry.masonry.api"
+build-backend = "poetry.core.masonry.api"
diff --git a/example_shared_isort_profile/pyproject.toml b/example_shared_isort_profile/pyproject.toml
index 48fa50850..cee710d69 100644
--- a/example_shared_isort_profile/pyproject.toml
+++ b/example_shared_isort_profile/pyproject.toml
@@ -15,4 +15,4 @@ python = ">=3.6"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]
-build-backend = "poetry.masonry.api"
+build-backend = "poetry.core.masonry.api"