diff --git a/DESCRIPTION b/DESCRIPTION
index c86bff43..eddfc6cf 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -30,10 +30,10 @@ Depends:
     R (>= 3.5)
 Imports: 
     ggplot2 (>= 3.4.0),
-    mirai (>= 0.12.0),
-    nanonext (>= 0.12.0),
+    mirai (>= 1.0.0),
+    nanonext (>= 1.0.0),
     RcppSimdJson (>= 0.1.9),
-    secretbase,
+    secretbase (>= 0.3.0),
     shiny (>= 1.4.0),
     xts,
     zoo
diff --git a/NAMESPACE b/NAMESPACE
index 1cd71785..1198b8d4 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -80,8 +80,7 @@ importFrom(ggplot2,theme)
 importFrom(ggplot2,theme_grey)
 importFrom(mirai,mirai)
 importFrom(nanonext,ncurl)
-importFrom(nanonext,strcat)
-importFrom(secretbase,sha3)
+importFrom(secretbase,sha256)
 importFrom(shiny,HTML)
 importFrom(shiny,checkboxInput)
 importFrom(shiny,column)
diff --git a/NEWS.md b/NEWS.md
index fe580556..34c43f87 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,7 @@
 # ichimoku 1.5.1.9000 (development)
 
+* `archive()` moves to SHA256 again (using the updated implementation in {secretbase}).
+
 # ichimoku 1.5.1
 
 * Fixes `oanda_studio()` so that the live chart no longer greys out when updating (with recent Shiny versions).
diff --git a/R/archive.R b/R/archive.R
index 18de462b..2c1b3646 100644
--- a/R/archive.R
+++ b/R/archive.R
@@ -45,11 +45,11 @@
 #'
 #' @section Data Verification:
 #'
-#'     A SHA3-256 hash of the original object is written to the archive. This
+#'     A SHA256 hash of the original object is written to the archive. This
 #'     allows the data integrity of the restored object to be verified when the
 #'     archive is read back.
 #'
-#'     For write operations: confirmation of the SHA3-256 hash written to file
+#'     For write operations: confirmation of the SHA256 hash written to file
 #'     is displayed.
 #'
 #'     For read operations: a 'data verified' message is issued if the SHA256
@@ -130,7 +130,7 @@ archive <- function(..., object, file) {
 
 #' Write Objects to Archive
 #'
-#' Internal function used to write objects, along with their SHA3-256 hash value,
+#' Internal function used to write objects, along with their SHA-256 hash value,
 #'     to archive files in the native RData format.
 #'
 #' @param object an object.
@@ -154,9 +154,9 @@ writeArchive <- function(object, file) {
     }
   }
 
-  x_archive_secure_hash <- sha3(object)
+  x_archive_secure_hash <- sha256(object)
   save(object, x_archive_secure_hash, file = file, compress = TRUE)
-  message(sprintf("Archive written to '%s'\nSHA3-256: %s", file, x_archive_secure_hash))
+  message(sprintf("Archive written to '%s'\nSHA256: %s", file, x_archive_secure_hash))
   invisible(file)
 
 }
@@ -164,7 +164,7 @@ writeArchive <- function(object, file) {
 #' Read Objects from Archive
 #'
 #' Internal function used to read objects from native RData files with stored
-#'     SHA3-256 hash values.
+#'     SHA256 hash values.
 #'
 #' @param file the name of the file or a connection where the object is saved to
 #'     or read from.
@@ -184,10 +184,10 @@ readArchive <- function(file) {
     stop("archive file was not created by archive()", call. = FALSE)
 
   message("Archive read from '", file, "'")
-  sha256 <- sha3(object)
+  sha256 <- sha256(object)
   if (identical(sha256, x_archive_secure_hash))
-    message("Data verified by SHA3-256: ", sha256) else
-      warning(sprintf("SHA3-256 of restored object:   %s\ndoes not match the original: %s", sha256, x_archive_secure_hash), call. = FALSE)
+    message("Data verified by SHA256: ", sha256) else
+      warning(sprintf("SHA256 of restored object:   %s\ndoes not match the original: %s", sha256, x_archive_secure_hash), call. = FALSE)
 
   object
 
diff --git a/R/data.R b/R/data.R
index 4bbd16a2..ed26d017 100644
--- a/R/data.R
+++ b/R/data.R
@@ -38,7 +38,7 @@
 
 .__global__ <- ".data"
 
-.user_agent <- strcat("r-ichimoku/", as.character(packageVersion("ichimoku")))
+.user_agent <- sprintf("r-ichimoku/%s", as.character(packageVersion("ichimoku")))
 
 .mlgrid_pairs <- {
   cols <- c("chikou", "close", "high", "low", "tenkan", "kijun", "senkouA", "senkouB", "cloudT", "cloudB")
diff --git a/R/ichimoku-package.R b/R/ichimoku-package.R
index f62c265d..7762f9b6 100644
--- a/R/ichimoku-package.R
+++ b/R/ichimoku-package.R
@@ -83,8 +83,8 @@
 #'     scale_x_continuous scale_y_continuous Stat StatIdentity theme theme_grey
 #'     %+replace%
 #' @importFrom mirai mirai
-#' @importFrom nanonext ncurl strcat
-#' @importFrom secretbase sha3
+#' @importFrom nanonext ncurl
+#' @importFrom secretbase sha256
 #' @importFrom RcppSimdJson is_valid_json
 #' @importFrom shiny checkboxInput column downloadButton downloadHandler HTML
 #'     fillPage fluidPage fluidRow hoverOpts invalidateLater isolate
diff --git a/R/oanda.R b/R/oanda.R
index 2acf1acf..dc85cc73 100644
--- a/R/oanda.R
+++ b/R/oanda.R
@@ -189,14 +189,14 @@ getPrices <- function(instrument, granularity, count = NULL, from = NULL,
   url <- sprintf(
     "https://api-fx%s.oanda.com/v3/instruments/%s/candles?granularity=%s&price=%s%s%s%s",
     switch(server, practice = "practice", live = "trade"), instrument, granularity, price,
-    if (length(count)) strcat("&count=", as.character(count)) else "",
-    if (length(from)) strcat("&from=", as.character(from)) else "",
-    if (length(to)) strcat("&to=", as.character(to)) else ""
+    if (length(count)) sprintf("&count=%s", as.character(count)) else "",
+    if (length(from)) sprintf("&from=%s", as.character(from)) else "",
+    if (length(to)) sprintf("&to=%s", as.character(to)) else ""
   )
   resp <- ncurl(url,
                 convert = FALSE,
                 follow = TRUE,
-                headers = c(Authorization = strcat("Bearer ", apikey),
+                headers = c(Authorization = sprintf("Bearer %s", apikey),
                             `Accept-Datetime-Format` = "UNIX",
                             `User-Agent` = .user_agent),
                 response = "date")
@@ -326,7 +326,7 @@ oanda_stream <- function(instrument, display = 8L, limit, server, apikey) {
   url <- paste0("https://stream-fx", switch(server, practice = "practice", live = "trade"),
                 ".oanda.com/v3/accounts/", do_$getAccount(server = server, apikey = apikey),
                 "/pricing/stream?instruments=", instrument)
-  headers <- c(Authorization = strcat("Bearer ", apikey),
+  headers <- c(Authorization = sprintf("Bearer %s", apikey),
                `Accept-Datetime-Format` = "UNIX",
                `User-Agent` = .user_agent)
 
@@ -1013,7 +1013,7 @@ oanda_positions <- function(instrument, time, server, apikey) {
                  switch(server, practice = "practice", live = "trade"), instrument,
                  if (missing(time)) "" else sprintf("?time=%.f", unclass(as.POSIXct(time))))
   resp <- ncurl(url, convert = FALSE, follow = TRUE,
-                headers = c(Authorization = strcat("Bearer ", apikey),
+                headers = c(Authorization = sprintf("Bearer %s", apikey),
                             `Accept-Datetime-Format` = "UNIX", `User-Agent` = .user_agent))
   resp[["status"]] == 200L ||
     stop("status code ", resp[["status"]], " - ",
@@ -1105,7 +1105,7 @@ oanda_orders <- function(instrument, time, server, apikey) {
                  switch(server, practice = "practice", live = "trade"), instrument,
                  if (missing(time)) "" else sprintf("?time=%.f", unclass(as.POSIXct(time))))
   resp <- ncurl(url, convert = FALSE, follow = TRUE,
-                headers = c(Authorization = strcat("Bearer ", apikey),
+                headers = c(Authorization = sprintf("Bearer %s", apikey),
                             `Accept-Datetime-Format` = "UNIX", `User-Agent` = .user_agent))
   resp[["status"]] == 200L ||
     stop("status code ", resp[["status"]], " - ",
diff --git a/R/switch.R b/R/switch.R
index a83d0f98..cdcdd1a7 100644
--- a/R/switch.R
+++ b/R/switch.R
@@ -121,7 +121,7 @@ do_ <- function() {
                       practice = "https://api-fxpractice.oanda.com/v3/accounts",
                       live = "https://api-fxtrade.oanda.com/v3/accounts")
         resp <- ncurl(url, convert = FALSE, follow = TRUE,
-                      headers = c("Authorization" = strcat("Bearer ", apikey),
+                      headers = c("Authorization" = sprintf("Bearer %s", apikey),
                                   "User-Agent" = .user_agent))
         resp[["status"]] == 200L ||
           stop("status code ", resp[["status"]], " - ", deserialize_json(resp[["data"]]), call. = FALSE)
@@ -140,7 +140,7 @@ do_ <- function() {
                        do_$getAccount(server = server, apikey = apikey))
         for (i in seq_len(2L)) {
           resp <- ncurl(url, convert = FALSE, follow = TRUE,
-                        headers = c("Authorization" = strcat("Bearer ", apikey),
+                        headers = c("Authorization" = sprintf("Bearer %s", apikey),
                                     "User-Agent" = .user_agent))
           resp[["status"]] == 200L && break
         }
diff --git a/man/archive.Rd b/man/archive.Rd
index 183ee3b5..a5c2fe1e 100644
--- a/man/archive.Rd
+++ b/man/archive.Rd
@@ -40,11 +40,11 @@ For read operations: specify only 'file', or alternatively if no
 \section{Data Verification}{
 
 
-    A SHA3-256 hash of the original object is written to the archive. This
+    A SHA256 hash of the original object is written to the archive. This
     allows the data integrity of the restored object to be verified when the
     archive is read back.
 
-    For write operations: confirmation of the SHA3-256 hash written to file
+    For write operations: confirmation of the SHA256 hash written to file
     is displayed.
 
     For read operations: a 'data verified' message is issued if the SHA256
diff --git a/vignettes/reference.Rmd b/vignettes/reference.Rmd
index 09d2dc02..ae924ef3 100644
--- a/vignettes/reference.Rmd
+++ b/vignettes/reference.Rmd
@@ -349,11 +349,11 @@ object <- archive()
 
 #### Data Integrity Verification
 
-Data integrity verification is performed by the SHA3-256 cryptographic hash algorithm from the 'secretbase' package.
+Data integrity verification is performed by the SHA256 cryptographic hash algorithm from the 'secretbase' package.
 
-When an archive is written, the serialised object is hashed and the hash is also stored in the archive. The SHA3-256 hash value is printed to the console as confirmation.
+When an archive is written, the serialised object is hashed and the hash is also stored in the archive. The SHA256 hash value is printed to the console as confirmation.
 
-When an archive is read back, the SHA3-256 hash of the restored object is checked against the hash of the original stored in the archive. If identical, a 'data verified' message is printed to the console along with the authenticated SHA3-256 hash.
+When an archive is read back, the SHA256 hash of the restored object is checked against the hash of the original stored in the archive. If identical, a 'data verified' message is printed to the console along with the authenticated SHA256 hash.
 
 ## Supplementary Information