diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 4733356..c6cebe4 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -18,7 +18,7 @@ jobs:
         include:
           - os: windows-latest
             omc-version: stable
-            msysEnvironment: --msysEnvironment=mingw64
+            msysEnvironment: --msysEnvironment=ucrt64
       fail-fast: false
     runs-on: ${{ matrix.os }}
     timeout-minutes: 60
diff --git a/requirements.txt b/requirements.txt
index c48dcc0..7c5e0e0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,6 +4,6 @@ juliacall
 matplotlib
 monotonic
 natsort
-ompython
+ompython==3.6
 psutil
 simplejson