diff --git a/Project.toml b/Project.toml
index a3d9221a..4b0b5f90 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "Vlasiator"
 uuid = "7d2ba682-ad6e-4e20-80d9-3f2d4a610bb4"
 authors = ["Hongyang Zhou <hyzhou@umich.edu>"]
-version = "0.9.33"
+version = "0.9.34"
 
 [deps]
 Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
diff --git a/src/vlsv/vlsvreader.jl b/src/vlsv/vlsvreader.jl
index 8dc51d19..4ef0c282 100644
--- a/src/vlsv/vlsvreader.jl
+++ b/src/vlsv/vlsvreader.jl
@@ -257,8 +257,8 @@ function load(file::AbstractString)
       nodeblockid)
 
    cellid = getcellid(fid, n.var)
-
-   cellindex = sortperm(cellid)
+   #TODO: check the new sorting algorithms in Julia 1.9!
+   cellindex = sortperm(cellid, alg=MergeSort)
 
    ncells, block_size, coordmin, coordmax = readmesh(fid, footer)