diff --git a/.github/workflows/test_mupdf-release-branch.yml b/.github/workflows/test_mupdf-release-branch.yml
index 8c9cb788a..ab0b29337 100644
--- a/.github/workflows/test_mupdf-release-branch.yml
+++ b/.github/workflows/test_mupdf-release-branch.yml
@@ -27,7 +27,7 @@ jobs:
 
       - name: test_mupdf-release-branch
         env:
-            inputs_PYMUPDF_SETUP_MUPDF_BUILD: "git:--recursive --depth 1 --shallow-submodules --branch 1.25.x https://github.com/ArtifexSoftware/mupdf.git"
+            inputs_PYMUPDF_SETUP_MUPDF_BUILD: "git:--recursive --depth 1 --shallow-submodules --branch 1.26.x https://github.com/ArtifexSoftware/mupdf.git"
             inputs_flavours: "0"
             inputs_sdist: "0"
             inputs_wheels_cps: "cp312*"