diff --git a/ci/requirements-optional-conda.txt b/ci/requirements-optional-conda.txt
index e8cfcdf80f2e8..27b927489b649 100644
--- a/ci/requirements-optional-conda.txt
+++ b/ci/requirements-optional-conda.txt
@@ -18,7 +18,7 @@ pytables
 pytest-cov
 pytest-xdist
 s3fs
-scipy
+scipy==1.2.1
 seaborn
 sqlalchemy
 xarray
diff --git a/ci/requirements-optional-pip.txt b/ci/requirements-optional-pip.txt
index 877c52fa0b4fd..dd161e5dc447e 100644
--- a/ci/requirements-optional-pip.txt
+++ b/ci/requirements-optional-pip.txt
@@ -20,7 +20,7 @@ tables
 pytest-cov
 pytest-xdist
 s3fs
-scipy
+scipy==1.2.1
 seaborn
 sqlalchemy
 xarray