diff --git a/pyproject.toml b/pyproject.toml
index 5359b01..70cca01 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,7 +35,7 @@ repair-wheel-command = "delvewheel repair --add-path lib/windows {wheel} -w {des
 
 [tool.cibuildwheel.linux]
 before-all = """
-pip install conan<2.0.0
+pip install "conan<2.0.0"
 conan profile new default --detect
 conan config set storage.path={package}/conan_data
 conan install --install-folder {package}/conan_build --remote conancenter {package}/conanfile.txt