diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 92b9d43..4484605 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -5,7 +5,7 @@ on:
 
 jobs:
   build:
-    runs-on: windows-latest
+    runs-on: windows-2016
 
     steps:
     - uses: actions/checkout@v2
diff --git a/requirements.txt b/requirements.txt
index 4bf1d56..49379e0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,3 @@
-numpy==1.9.3
 pyirsdk
 stomper
 websocket