diff --git a/DESCRIPTION b/DESCRIPTION
index 17ef0bbe3..111ff7f38 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -26,7 +26,6 @@ Depends:
     R (>= 3.2.0)
 Imports:
     arrow,
-    base64enc,
     crayon,
     digest,
     filelock,
@@ -44,20 +43,15 @@ Imports:
     yaml,
     zip
 Suggests:
-    callr,
-    covr,
-    data.table,
     datasets,
+    data.table,
     knitr,
     R.utils,
-    R6,
     rmarkdown,
     rsconnect,
     shiny,
-    stringi,
     testthat (>= 3.0.0),
-    tibble,
-    xml2
+    tibble
 VignetteBuilder: 
     knitr
 Config/testthat/edition: 3
diff --git a/R/board_azure.R b/R/board_azure.R
index a6dcb96b3..bec773d75 100644
--- a/R/board_azure.R
+++ b/R/board_azure.R
@@ -90,8 +90,8 @@ azure_headers <- function(board, verb, path, file) {
     sep = "\n"
   )
 
-  signature <- openssl::sha256(charToRaw(content), key = base64enc::base64decode(board$key)) %>%
-    base64enc::base64encode()
+  signature <- openssl::sha256(charToRaw(content), key = jsonlite::base64_dec(board$key)) %>%
+    jsonlite::base64_enc()
 
   headers <- httr::add_headers(
     `x-ms-date` = date,
diff --git a/R/board_dospaces.R b/R/board_dospaces.R
index 133c287e2..0543f714b 100644
--- a/R/board_dospaces.R
+++ b/R/board_dospaces.R
@@ -74,7 +74,7 @@ dospace_headers <- function(board, verb, path, file) {
   )
 
   signature <- openssl::sha1(charToRaw(content), key = board$secret) %>%
-    base64enc::base64encode()
+    jsonlite::base64_enc()
 
   headers <- httr::add_headers(
     Host = paste0(space, ".", board$datacenter, ".", board$host),
diff --git a/R/board_github.R b/R/board_github.R
index d5eb90c23..9d5ff298b 100644
--- a/R/board_github.R
+++ b/R/board_github.R
@@ -120,7 +120,7 @@ github_update_temp_index <- function(board, path, commit, operation, name = NULL
 
     # API returns contents when size < 1mb
     if (!is.null(content$content)) {
-      index <- board_manifest_load(rawToChar(base64enc::base64decode(content$content)))
+      index <- board_manifest_load(rawToChar(jsonlite::base64_dec(content$content)))
     }
     else {
       response <- httr::GET(content$download_url, github_headers(board))
@@ -169,7 +169,7 @@ github_update_index <- function(board, path, commit, operation, name = NULL, met
 
   file_url <- github_url(board, branch = branch, "/contents/", board$path, "data.txt")
 
-  base64 <- base64enc::base64encode(index_file)
+  base64 <- jsonlite::base64_enc(index_file)
   response <- httr::PUT(file_url,
     body = list(
       message = commit,
@@ -257,7 +257,7 @@ github_upload_content <- function(board, name, file, file_path, commit, sha, bra
   file_url <- github_url(board, branch = branch, "/contents/", board$path, name, "/", file)
   pin_log("uploading ", file_url)
 
-  base64 <- base64enc::base64encode(file_path)
+  base64 <- jsonlite::base64_enc(file_path)
   response <- httr::PUT(file_url,
     body = list(
       message = commit,
@@ -280,7 +280,7 @@ github_upload_blob <- function(board, file, file_path, commit) {
   blob_url <- github_url(board, branch = NULL, "/git/blobs")
   pin_log("uploading ", file)
 
-  base64 <- base64enc::base64encode(file_path)
+  base64 <- jsonlite::base64_enc(file_path)
   response <- httr::POST(blob_url,
     body = list(
       content = base64,
@@ -502,7 +502,7 @@ board_pin_find.pins_board_github <- function(board, text, ...) {
       content <- httr::content(result, encoding = "UTF-8")
     }
     else {
-      content <- rawToChar(base64enc::base64decode(content$content))
+      content <- rawToChar(jsonlite::base64_dec(content$content))
     }
 
     result <- board_manifest_load(content) %>%
diff --git a/R/board_s3.R b/R/board_s3.R
index 3417d52aa..96a9bc655 100644
--- a/R/board_s3.R
+++ b/R/board_s3.R
@@ -192,7 +192,7 @@ s3_headers <- function(board, verb, path, file) {
     )
 
     signature <- openssl::sha1(charToRaw(content), key = board$secret) %>%
-      base64enc::base64encode()
+      jsonlite::base64_enc()
 
     headers <- httr::add_headers(
       Host = paste0(bucket, ".", board$host),
diff --git a/tests/testthat/test-board-azure.R b/tests/testthat/test-board-azure.R
index 6fcb41ad4..41ba47c7c 100644
--- a/tests/testthat/test-board-azure.R
+++ b/tests/testthat/test-board-azure.R
@@ -1,5 +1,5 @@
 test_that("board contains proper azure headers", {
-  mock_board <- list(key = base64enc::base64encode(as.raw(1:3)), url = "https://foo.com")
+  mock_board <- list(key = jsonlite::base64_enc(as.raw(1:3)), url = "https://foo.com")
   headers <- names(azure_headers(mock_board, "PUT", "x", "files/hello.txt")$headers)
 
   expect_true("x-ms-date" %in% headers)
diff --git a/tests/testthat/test-pin_registry.R b/tests/testthat/test-pin_registry.R
index 9a7dc7fa7..18a79d8e0 100644
--- a/tests/testthat/test-pin_registry.R
+++ b/tests/testthat/test-pin_registry.R
@@ -30,41 +30,3 @@ test_that("can access entries", {
   pin_registry_update(board, "x", list(test = "x"))
   expect_equal(pin_registry_retrieve(board, "x"), list(test = "x", name = "x"))
 })
-
-test_that("can pin() concurrently", {
-  # BEWARE: this tests the INSTALLED versions of pins
-  skip_on_ci()
-  # This fails on CI in a way that I can not replicate locally, even when I
-  # make n_proc and n_pins substantially larger. I've skipped it because
-  # I don't think multi-process race conditions are likely to be a problem
-  # in real-life.
-
-  temp_path <- withr::local_tempdir()
-  board <- board_folder(temp_path)
-
-  n_proc <- 10
-  n_pins <- 10
-
-  pin_n <- function(path, proc, n_pins) {
-    board <- pins::board_folder(path)
-    data <- list(message = "concurrent test")
-    for (i in seq_len(n_pins)) {
-      pins::pin(data, name = as.character(proc * 100 + i), board = board)
-    }
-  }
-
-  processes <- list()
-  for (i in seq_len(n_proc)) {
-    processes[[i]] <- callr::r_bg(pin_n, list(
-      path = temp_path,
-      proc = i,
-      n_pins = n_pins
-    ))
-  }
-  for (i in seq_len(n_proc)) {
-    processes[[i]]$wait()
-  }
-
-  index <- pin_registry_read(board)
-  expect_equal(length(index), n_proc * n_pins)
-})