diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index 884cf18..da10564 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -31,6 +31,7 @@ jobs:
         - pyinstrument
         - PyYAML
         - shapely
+        - tornado
         - yappi
         - zope.interface
 
diff --git a/packages.toml b/packages.toml
index 66cad7d..da79d2d 100644
--- a/packages.toml
+++ b/packages.toml
@@ -97,6 +97,8 @@ pre_script = "scripts/build_geos.sh"
 [packages.shapely.environment]
 GEOS_CONFIG = "/usr/local/arm-nilrt-linux-gnueabi/sysroot/usr/bin/geos-config"
 
+[packages.tornado]
+version = "6.4.2"
 
 [packages."zope.interface"]
 version = "7.1.0"