diff --git a/.github/workflows/executables.yml b/.github/workflows/executables.yml
index d1fc5e11..8a7313d0 100644
--- a/.github/workflows/executables.yml
+++ b/.github/workflows/executables.yml
@@ -13,7 +13,7 @@ jobs:
         python-version: ["3.9"]
         architecture: ["x64"]
         include:
-        - os: "windows-2016"
+        - os: "windows-2019"
           python-version: "3.8"
           architecture: "x86"
 
diff --git a/gallery_dl/version.py b/gallery_dl/version.py
index 54c81aab..7bd89ecd 100644
--- a/gallery_dl/version.py
+++ b/gallery_dl/version.py
@@ -6,4 +6,4 @@
 # it under the terms of the GNU General Public License version 2 as
 # published by the Free Software Foundation.
 
-__version__ = "1.21.0"
+__version__ = "1.21.1-dev"