diff --git a/.Rbuildignore b/.Rbuildignore
index 4ef4e99..8ec4dba 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -6,3 +6,5 @@
 ^paper$
 .github
 ^_pkgdown\.yaml$
+^doc$
+^Meta$
diff --git a/.gitignore b/.gitignore
index fb8ad83..812dc62 100644
--- a/.gitignore
+++ b/.gitignore
@@ -47,3 +47,5 @@ Thumbs.db
 ~
 .Rproj.user
 .Rhistory
+/doc/
+/Meta/
diff --git a/DESCRIPTION b/DESCRIPTION
index 298128f..a048f88 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: simpleCache
-Version: 0.4.1
-Date: 2019-02-26
+Version: 0.4.2
+Date: 2021-04-16
 Title: Simply Caching R Objects
 Description: Provides intuitive functions for caching R objects, encouraging
     reproducible, restartable, and distributed R analysis. The user selects a
@@ -15,11 +15,12 @@ Authors@R: c(person("VP", "Nagraj", email = "vpnagraj@virginia.edu", role =
     role = c("aut", "cre")))
 Suggests:
     knitr,
+    rmarkdown,
     testthat
 Enhances: batchtools
 VignetteBuilder: knitr
 License: BSD_2_clause + file LICENSE
 Encoding: UTF-8
-URL: https://www.github.com/databio/simpleCache
-BugReports: https://www.github.com/databio/simpleCache
-RoxygenNote: 6.1.1
+URL: https://github.com/databio/simpleCache
+BugReports: https://github.com/databio/simpleCache
+RoxygenNote: 7.1.1
diff --git a/NEWS.md b/NEWS.md
index 6fd7f24..018f25e 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,6 +1,10 @@
 # Change log
 All notable changes to this project will be documented in this file.
 
+## simpleCache [0.4.2] -- 2021-04-16
+
+	- updates to accommodate latest knitr for vignettes
+
 ## simpleCache [0.4.1] -- 2019-02-26
 
 	- fixes unit tests on windows
diff --git a/R/utility.R b/R/utility.R
index e3b1992..2e19d48 100644
--- a/R/utility.R
+++ b/R/utility.R
@@ -51,24 +51,26 @@ secToTime = function(timeInSec) {
 	sprintf("%02.01f", signif(sec, 3)), "s"))
 }
 
+ticTocEnv = new.env()
+
 #' Start a timer
 #' @param gcFirst Garbage Collect before starting the timer?
 #' @param type Type of time to return, 
 #' can be 'elapsed', 'user.self', or 'sys.self'
 tic = function(gcFirst = TRUE, type=c("elapsed", "user.self", "sys.self")) {
 	type <- match.arg(type)
-	assign(".type_simpleCache", type, envir=baseenv())
+	assign(".type_simpleCache", type, envir=ticTocEnv)
 	if(gcFirst) gc(FALSE)
 	tic <- proc.time()[type]         
-	assign(".tic_simpleCache", tic, envir=baseenv())
+	assign(".tic_simpleCache", tic, envir=ticTocEnv)
 	invisible(tic)
 }
 
 #' Check the time since the current timer was started with tic()
 toc = function() {
-	type <- get(".type_simpleCache", envir=baseenv())
+	type <- get(".type_simpleCache", envir=ticTocEnv)
 	toc <- proc.time()[type]
-	tic <- get(".tic_simpleCache", envir=baseenv())
+	tic <- get(".tic_simpleCache", envir=ticTocEnv)
 	timeInSec = as.numeric(toc-tic);
 	message("<", secToTime(timeInSec), ">", appendLF=FALSE)
 	invisible(toc)
diff --git a/man/simpleCache-package.Rd b/man/simpleCache-package.Rd
index 5d34032..edd24d0 100644
--- a/man/simpleCache-package.Rd
+++ b/man/simpleCache-package.Rd
@@ -22,8 +22,8 @@ Provides intuitive functions for caching R objects, encouraging
 \seealso{
 Useful links:
 \itemize{
-  \item \url{https://www.github.com/databio/simpleCache}
-  \item Report bugs at \url{https://www.github.com/databio/simpleCache}
+  \item \url{https://github.com/databio/simpleCache}
+  \item Report bugs at \url{https://github.com/databio/simpleCache}
 }
 
 }
diff --git a/man/simpleCache.Rd b/man/simpleCache.Rd
index b4d2ce9..d231db1 100644
--- a/man/simpleCache.Rd
+++ b/man/simpleCache.Rd
@@ -4,14 +4,27 @@
 \alias{simpleCache}
 \title{Create a new cache or load a previously created cache.}
 \usage{
-simpleCache(cacheName, instruction = NULL, buildEnvir = NULL,
-  reload = FALSE, recreate = FALSE, noload = FALSE,
-  cacheDir = getCacheDir(), cacheSubDir = NULL, timer = FALSE,
-  buildDir = getOption("RBUILD.DIR"), assignToVariable = NULL,
+simpleCache(
+  cacheName,
+  instruction = NULL,
+  buildEnvir = NULL,
+  reload = FALSE,
+  recreate = FALSE,
+  noload = FALSE,
+  cacheDir = getCacheDir(),
+  cacheSubDir = NULL,
+  timer = FALSE,
+  buildDir = getOption("RBUILD.DIR"),
+  assignToVariable = NULL,
   loadEnvir = parent.frame(),
-  searchEnvir = getOption("SIMPLECACHE.ENV"), nofail = FALSE,
-  batchRegistry = NULL, batchResources = NULL, pepSettings = NULL,
-  ignoreLock = FALSE, lifespan = NULL)
+  searchEnvir = getOption("SIMPLECACHE.ENV"),
+  nofail = FALSE,
+  batchRegistry = NULL,
+  batchResources = NULL,
+  pepSettings = NULL,
+  ignoreLock = FALSE,
+  lifespan = NULL
+)
 }
 \arguments{
 \item{cacheName}{A character vector for a unique name for the cache. Be careful.}
diff --git a/man/storeCache.Rd b/man/storeCache.Rd
index 3f5bfe3..0d2a773 100644
--- a/man/storeCache.Rd
+++ b/man/storeCache.Rd
@@ -4,8 +4,12 @@
 \alias{storeCache}
 \title{Stores as a cache an already-produced R object}
 \usage{
-storeCache(cacheName, cacheDir = getCacheDir(), cacheSubDir = NULL,
-  recreate = FALSE)
+storeCache(
+  cacheName,
+  cacheDir = getCacheDir(),
+  cacheSubDir = NULL,
+  recreate = FALSE
+)
 }
 \arguments{
 \item{cacheName}{Unique name for the cache (and R object to be cached).}