diff --git a/docs/build_notebooks.jl b/docs/build_notebooks.jl
index 9c66247..2baed9d 100644
--- a/docs/build_notebooks.jl
+++ b/docs/build_notebooks.jl
@@ -10,7 +10,7 @@ for ipynb in readdir("tutorials")
     status = 1
     println("Running notebook tutorials/$ipynb")
     try
-        run(`runipy -o tutorials/$ipynb --kernel=julia-0.4 --port=0`)
+        run(`runipy -o tutorials/$ipynb --kernel=julia-0.4 --port=34211`)
         runtime = toc()
         status = 0
     catch
@@ -43,4 +43,4 @@ footer = """
 
 write_login_markdown(preamble, results, footer)
 
-end
\ No newline at end of file
+end