diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index e11b29e..745ff68 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -119,6 +119,7 @@ jobs:
             mingw-w64-x86_64-make
             mingw-w64-x86_64-gmp
             mingw-w64-x86_64-gc
+            mingw-w64-x86_64-flex
 
       - name: Build Project
         run: |