diff --git a/atlas b/atlas
index beefd14..db42d95 100755
--- a/atlas
+++ b/atlas
@@ -516,9 +516,13 @@ pull_translations() {
   # controlled by uploadpack.allowAnySHA1InWant and related configs. (GitHub
   # does allow this, though.)
   #
-  # The partialClone config override is needed for git 2.25 and possibly
-  # later versions (but not in 2.30 and later).
-  git -c extensions.partialClone=origin fetch \
+  # The `remote.<name>.promisor` config override is needed for git 2.25 and possibly
+  # later versions (but not in 2.30 and later). In some versions it might instead
+  # need to be written as `extensions.partialClone=origin` -- 2.25.1 mentions this
+  # in its output if a promisor is not set, but doesn't actually *use* that config.
+  # Probably extensions.partialClone is only used by earlier versions that we don't
+  # need to support. But it's harmless to set anyhow.
+  git -c remote.origin.promisor=true -c extensions.partialClone=origin fetch \
       $quiet --filter=blob:none --depth=1 origin "${pull_revision:-main}" || exit
 
   # finished "Creating a temporary Git repository to pull translations into <temp dir>..." step
diff --git a/spec/pull_spec.sh b/spec/pull_spec.sh
index c32129e..4c8a31f 100644
--- a/spec/pull_spec.sh
+++ b/spec/pull_spec.sh
@@ -89,7 +89,7 @@ Describe 'Pull with directory param'
 git init translations_TEMP
 cd translations_TEMP
 git remote add origin https://github.com/pull_repository.git
-git -c extensions.partialClone=origin fetch --filter=blob:none --depth=1 origin pull_revision
+git -c remote.origin.promisor=true -c extensions.partialClone=origin fetch --filter=blob:none --depth=1 origin pull_revision
 Done.
 Setting git sparse-checkout rules...
 git sparse-checkout set --no-cone !* pull_directory/** pull_dir2/** missing_pull_dir/**
@@ -162,7 +162,7 @@ Describe 'Pull filters'
     The output should equal 'git init translations_TEMP
 cd translations_TEMP
 git remote add origin https://github.com/pull_repository.git
-git -c extensions.partialClone=origin fetch --filter=blob:none --depth=1 origin pull_revision
+git -c remote.origin.promisor=true -c extensions.partialClone=origin fetch --filter=blob:none --depth=1 origin pull_revision
 git sparse-checkout set --no-cone !* pull_directory/**/ar/** pull_directory/**/ar.* pull_directory/**/es_419/** pull_directory/**/es_419.* pull_directory/**/fr_CA/** pull_directory/**/fr_CA.*
 git checkout FETCH_HEAD
 cd ..'