diff --git a/.github/workflows/nightly_hartknott.yml b/.github/workflows/nightly_hartknott.yml
index 4e302bd9da..fc4ef112f3 100644
--- a/.github/workflows/nightly_hartknott.yml
+++ b/.github/workflows/nightly_hartknott.yml
@@ -17,7 +17,7 @@ jobs:
       SCM_BRANCH: hardknott
       SCM_BRANCH_META_CLANG: hardknott
       SCM_BRANCH_META_OE: hardknott
-      SCM_BRANCH_RUBYGEMS: master
+      SCM_BRANCH_RUBYGEMS: hardknott
       BUILD_GLIBC: 1
       BUILD_KERNEL: 1
       BUILD_MAXRUNTIME: 21000
diff --git a/.github/workflows/nightly_honister.yml b/.github/workflows/nightly_honister.yml
index 8d0eee334f..b017caa80b 100644
--- a/.github/workflows/nightly_honister.yml
+++ b/.github/workflows/nightly_honister.yml
@@ -17,7 +17,7 @@ jobs:
       SCM_BRANCH: honister
       SCM_BRANCH_META_CLANG: honister
       SCM_BRANCH_META_OE: honister
-      SCM_BRANCH_RUBYGEMS: master
+      SCM_BRANCH_RUBYGEMS: hardknott
       BUILD_GLIBC: 1
       BUILD_KERNEL: 1
       BUILD_MAXRUNTIME: 21000