diff --git a/zshrc b/zshrc
index e70e2dd..ef8fdb6 100644
--- a/zshrc
+++ b/zshrc
@@ -68,7 +68,7 @@ alias gd='g diff'
 alias glog='g log --graph --oneline'
 alias gst='g status --short --branch'
 # update all repositories within the current directory
-alias update_repositories='find . -name ".git" -type d | xargs -P8 -I{} git --git-dir={} pull'
+alias update_repositories='find . -name ".git" -type d | xargs -P4 -I{} git --git-dir={} --work-tree={} pull'
 
 # Suppresses line numbers in less
 alias less='less --line-numbers'