diff --git a/R/testing.R b/R/testing.R
index 5a306839a..d5f1d2b90 100644
--- a/R/testing.R
+++ b/R/testing.R
@@ -196,6 +196,17 @@ testthat_file <- function(...) {
   file.path(rprojroot::find_testthat_root_file(), ...)
 }
 
+#' Convert a serialized R object to a certaion verion.
+#'
+#' Needed to make [testthat::exect_known_value()] work on R < 3.6.
+#' @param path A path to an rds file.
+#' @param version The target version.
+rds_to_version <- function(path, version = 2) {
+  readRDS(path) %>%
+    saveRDS(path, version = version)
+}
+
+
 
 #' Copy a file to a temporary directory
 #'
diff --git a/man/rds_to_version.Rd b/man/rds_to_version.Rd
new file mode 100644
index 000000000..044ea4e70
--- /dev/null
+++ b/man/rds_to_version.Rd
@@ -0,0 +1,16 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/testing.R
+\name{rds_to_version}
+\alias{rds_to_version}
+\title{Convert a serialized R object to a certaion verion.}
+\usage{
+rds_to_version(path, version = 2)
+}
+\arguments{
+\item{path}{A path to an rds file.}
+
+\item{version}{The target version.}
+}
+\description{
+Needed to make \code{\link[testthat:exect_known_value]{testthat::exect_known_value()}} work on R < 3.6.
+}
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