diff --git a/dev-python/pyFFTW/pyFFTW-0.13.1.ebuild b/dev-python/pyFFTW/pyFFTW-0.13.1.ebuild
index 0c4c2093e..c838a75f2 100644
--- a/dev-python/pyFFTW/pyFFTW-0.13.1.ebuild
+++ b/dev-python/pyFFTW/pyFFTW-0.13.1.ebuild
@@ -29,7 +29,7 @@ RDEPEND="
 	${DEPEND}
 "
 BDEPEND="
-	>=dev-python/cython-0.29.18[${PYTHON_USEDEP}]
+	>=dev-python/cython-0.29.18[${PYTHON_USEDEP}] <dev-python/cython-3.0.0
 	test? (
 		>=dev-python/dask-1.0[${PYTHON_USEDEP}]
 		>=dev-python/scipy-1.8.0[${PYTHON_USEDEP}]
diff --git a/dev-python/pyFFTW/pyFFTW-9999.ebuild b/dev-python/pyFFTW/pyFFTW-9999.ebuild
index da38b0d77..219469532 100644
--- a/dev-python/pyFFTW/pyFFTW-9999.ebuild
+++ b/dev-python/pyFFTW/pyFFTW-9999.ebuild
@@ -25,7 +25,7 @@ RDEPEND="
 	${DEPEND}
 "
 BDEPEND="
-	>=dev-python/cython-0.29.18[${PYTHON_USEDEP}]
+	>=dev-python/cython-0.29.18[${PYTHON_USEDEP}] <dev-python/cython-3.0.0
 	test? (
 		>=dev-python/dask-1.0[${PYTHON_USEDEP}]
 		>=dev-python/scipy-1.8.0[${PYTHON_USEDEP}]