diff --git a/DESCRIPTION b/DESCRIPTION
index a595f51..53b120b 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: proofr
 Title: Client for the PROOF API
-Version: 0.2.0.93
+Version: 0.2.0.94
 Authors@R: 
     person("Scott", "Chamberlain", , "sachamber@fredhutch.org", role = c("aut", "cre"),
            comment = c(ORCID = "0000-0003-1444-9135"))
diff --git a/R/utils.R b/R/utils.R
index 7824706..fc35650 100644
--- a/R/utils.R
+++ b/R/utils.R
@@ -1,6 +1,7 @@
-proof_base <- "https://proof-api.fredhutch.org"
 
 make_url <- function(...) {
+  proof_base <- Sys.getenv("PROOF_API_BASE_URL",
+    "https://proof-api.fredhutch.org")
   file.path(proof_base, ...)
 }