diff --git a/NAMESPACE b/NAMESPACE
index 2d04018..6ff735e 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -73,6 +73,9 @@ export(warningp)
 export(zipit)
 exportPattern("^[[:alpha:]]+")
 importFrom(Rcpp,evalCpp)
+importFrom(assertthat,assert_that)
+importFrom(assertthat,is.flag)
+importFrom(assertthat,is.string)
 importFrom(dplyr,"%>%")
 importFrom(methods,is)
 importFrom(rlang,"!!")
diff --git a/R/FastUtils-package.R b/R/FastUtils-package.R
index e049764..5888ad7 100644
--- a/R/FastUtils-package.R
+++ b/R/FastUtils-package.R
@@ -8,6 +8,7 @@
 #' @importFrom rlang !!
 #' @importFrom methods is
 #' @importFrom Rcpp evalCpp
+#' @importFrom assertthat assert_that is.flag is.string
 #' @useDynLib FastUtils, .registration = TRUE
 ## usethis namespace: end
 NULL
diff --git a/R/character.R b/R/character.R
index b3fb910..8eac5b9 100644
--- a/R/character.R
+++ b/R/character.R
@@ -20,9 +20,9 @@
 #' substrEnd("12345", 2, 3)
 #'
 substrEnd <- function(x, start, endDiff) {
-    assertthat::assert_that(is.character(x))
-    assertthat::assert_that(is.numeric(start))
-    assertthat::assert_that(is.numeric(endDiff))
+    assert_that(is.character(x))
+    assert_that(is.numeric(start))
+    assert_that(is.numeric(endDiff))
     substr(x, start, nchar(x) - endDiff)
 }
 
@@ -41,9 +41,9 @@ substrEnd <- function(x, start, endDiff) {
 #' @examples
 #' enclose("text", "[", "]") # returns "[text]"
 enclose <- function(x, left, right) {
-    assertthat::assert_that(is.character(x))
-    assertthat::assert_that(is.character(left))
-    assertthat::assert_that(is.character(right))
+    assert_that(is.character(x))
+    assert_that(is.character(left))
+    assert_that(is.character(right))
     paste0(left, x, right)
 }
 
@@ -59,7 +59,7 @@ enclose <- function(x, left, right) {
 #' @examples
 #' encloseBr("text") # returns "(text)"
 encloseBr <- function(x) {
-    assertthat::assert_that(is.character(x))
+    assert_that(is.character(x))
     enclose(x, "(", ")")
 }
 
@@ -81,8 +81,8 @@ encloseBr <- function(x) {
 #' getChar("hello", 2)
 getChar <- function(x, index) {
 
-    assertthat::assert_that(is.character(x))
-    assertthat::assert_that(
+    assert_that(is.character(x))
+    assert_that(
         is.numeric(index) && (length(index) == length(x) || length(index) == 1)
     )
 
diff --git a/R/dataInitialization.R b/R/dataInitialization.R
index aa165b1..5a87806 100644
--- a/R/dataInitialization.R
+++ b/R/dataInitialization.R
@@ -132,7 +132,7 @@ tableToNumeric <- function(x) {
 #' vec <- c(a = 1, b = 2, c = 3)
 #' namedNumericToTable(vec)
 namedNumericToTable <- function(x) {
-    assertthat::assert_that(is.numeric(x) && !is.null(names(x)))
+    assert_that(is.numeric(x) && !is.null(names(x)))
     output <- as.integer(x)
     names(output) <- names(x)
     output <- as.table(output)
@@ -159,8 +159,8 @@ namedNumericToTable <- function(x) {
 createHash <- function(keys, initVals = NULL) {
 
     if (missing(keys)) return(hash::hash())
-    assertthat::assert_that(is.character(keys))
-    assertthat::assert_that(is.null(initVals) || length(initVals) == 1)
+    assert_that(is.character(keys))
+    assert_that(is.null(initVals) || length(initVals) == 1)
 
     keys <- unique(keys)
     numkeys <- length(keys)
diff --git a/R/fileSystem.R b/R/fileSystem.R
index e8a9332..4fad54f 100644
--- a/R/fileSystem.R
+++ b/R/fileSystem.R
@@ -22,7 +22,7 @@
 #'
 listFiles <- function(dirPath, ...) {
 
-    assertthat::assert_that(assertthat::is.string(dirPath))
+    assert_that(is.string(dirPath))
 
     filesAndDirs <- base::do.call(
         list.files,
diff --git a/R/ggplot.R b/R/ggplot.R
index e5759a7..d9dbecf 100644
--- a/R/ggplot.R
+++ b/R/ggplot.R
@@ -17,7 +17,7 @@
 #' getPlotDims(ggplot(mtcars) + geom_point(aes(mpg, cyl)))
 #'
 getPlotDims <- function(plt) {
-    assertthat::assert_that(ggplot2::is.ggplot(plt))
+    assert_that(ggplot2::is.ggplot(plt))
     builtPlotLayout <- ggplot2::ggplot_build(plt)$layout
     list(
         xr = builtPlotLayout$panel_scales_x[[1]]$range$range,
diff --git a/R/higherOrderFunctions.R b/R/higherOrderFunctions.R
index b8230a8..1444975 100644
--- a/R/higherOrderFunctions.R
+++ b/R/higherOrderFunctions.R
@@ -21,7 +21,7 @@
 #'
 createMutator <- function(binaryOperator) {
 
-    assertthat::assert_that(
+    assert_that(
         is.function(binaryOperator) && length(formals(binaryOperator)) >= 2
     )
 
diff --git a/R/math.R b/R/math.R
index fe13a1d..a3a8f34 100644
--- a/R/math.R
+++ b/R/math.R
@@ -46,13 +46,13 @@ isBound <- function(num, lowerbound, upperbound) {
 }
 
 .assertNumAndBoundsAreValid <- function(num, lowerbound, upperbound) {
-    assertthat::assert_that(is.numeric(num))
-    assertthat::assert_that(is.numeric(lowerbound))
-    assertthat::assert_that(
+    assert_that(is.numeric(num))
+    assert_that(is.numeric(lowerbound))
+    assert_that(
         length(lowerbound) == 1 || length(lowerbound) == length(num)
     )
-    assertthat::assert_that(is.numeric(upperbound))
-    assertthat::assert_that(
+    assert_that(is.numeric(upperbound))
+    assert_that(
         length(upperbound) == 1 || length(upperbound) == length(num)
     )
 }
diff --git a/R/packageDevelopment.R b/R/packageDevelopment.R
index bab1423..dfdd8b5 100644
--- a/R/packageDevelopment.R
+++ b/R/packageDevelopment.R
@@ -27,8 +27,8 @@
 #'
 getPkgKeywords <- function(pkg = ".", asDistribution = FALSE) {
 
-    assertthat::assert_that(assertthat::is.string(pkg))
-    assertthat::assert_that(assertthat::is.flag(asDistribution))
+    assert_that(is.string(pkg))
+    assert_that(is.flag(asDistribution))
 
     if (!dir.exists(pkg)) {
         warning("the package path does not exist")
@@ -107,9 +107,9 @@ findMissingRdSections <- function(
     .ignore = "-package$" # are these used?
 ) {
 
-    assertthat::assert_that(is.character(sectionName))
-    assertthat::assert_that(assertthat::is.string(pkg))
-    assertthat::assert_that(is.null(ignore) || is.character(ignore))
+    assert_that(is.character(sectionName))
+    assert_that(is.string(pkg))
+    assert_that(is.null(ignore) || is.character(ignore))
 
     paste("\\", sectionName, "{", sep = "") %>%
         greplDir(file.path(pkg, "man")) %>%
@@ -150,9 +150,9 @@ removeVdiffrNewSnapShots <- function(
     verbose = TRUE
 ) {
 
-    assertthat::assert_that(assertthat::is.string(pkg))
-    assertthat::assert_that(assertthat::is.string(snapDir))
-    assertthat::assert_that(assertthat::is.flag(verbose))
+    assert_that(is.string(pkg))
+    assert_that(is.string(snapDir))
+    assert_that(is.flag(verbose))
 
     if (!dir.exists(snapDir)) return(invisible())
 
diff --git a/R/regex.R b/R/regex.R
index bca4c04..5428a1a 100644
--- a/R/regex.R
+++ b/R/regex.R
@@ -41,7 +41,7 @@ joinRegex <- function(...) {
 #'
 rmByName <- function(x, pattern, silent = FALSE) {
 
-    assertthat::assert_that(is.character(pattern))
+    assert_that(is.character(pattern))
 
     if (length(x) == 0) return(x)
 
diff --git a/R/spelling.R b/R/spelling.R
index efb2071..4e1a717 100644
--- a/R/spelling.R
+++ b/R/spelling.R
@@ -36,12 +36,12 @@ trySplitWords <- function(
 ) {
 
     x <- unlist(list(...), use.names = FALSE)
-    assertthat::assert_that(is.character(x))
+    assert_that(is.character(x))
 
     # could allow vectorize for all these...
-    assertthat::assert_that(assertthat::is.flag(conseq))
-    assertthat::assert_that(assertthat::is.flag(strictSnake))
-    assertthat::assert_that(assertthat::is.flag(uncase))
+    assert_that(is.flag(conseq))
+    assert_that(is.flag(strictSnake))
+    assert_that(is.flag(uncase))
 
     lapply(x, function(y) {
         if (isCamelCase(y) || isPascalCase(y)) {
@@ -85,7 +85,7 @@ trySplitWords <- function(
 
 splitCamel <- function(x, conseq = TRUE) {
 
-    assertthat::assert_that(is.character(x))
+    assert_that(is.character(x))
 
     # could vectorize conseq
     if (isTRUE(conseq)) {
@@ -120,7 +120,7 @@ splitPascal <- splitCamel
 #' splitSnake("another_example_here")
 #'
 splitSnake <- function(x) {
-    assertthat::assert_that(is.character(x))
+    assert_that(is.character(x))
     strsplit(x, "_", fixed = TRUE)
 }
 
@@ -141,7 +141,7 @@ splitSnake <- function(x) {
 #' isCamelCase("camelcase")   # returns TRUE
 #'
 isCamelCase <- function(x) {
-    assertthat::assert_that(is.character(x))
+    assert_that(is.character(x))
     grepl("^[a-z]+[A-Z]?([A-Za-z]*?)$", x)
 }
 
@@ -161,7 +161,7 @@ isCamelCase <- function(x) {
 #' isPascalCase("pascalCase") # returns FALSE
 #' isPascalCase("Pascalcase") # returns TRUE
 isPascalCase <- function(x) {
-    assertthat::assert_that(is.character(x))
+    assert_that(is.character(x))
     grepl("^[A-Z]+[a-z]?([A-Za-z]*?)$", x)
 }
 
@@ -189,8 +189,8 @@ isPascalCase <- function(x) {
 #'
 isSnakeCase <- function(x, strict = TRUE) {
 
-    assertthat::assert_that(is.character(x))
-    assertthat::assert_that(assertthat::is.flag(strict))
+    assert_that(is.character(x))
+    assert_that(is.flag(strict))
 
     grepl(
         ifelse(
@@ -217,7 +217,7 @@ isSnakeCase <- function(x, strict = TRUE) {
 #' # Check if 'b' is a vowel
 #' isVowel("b")
 isVowel <- function(x) {
-    assertthat::assert_that(is.character(x))
+    assert_that(is.character(x))
     tolower(x) %in% c("a", "e", "i", "o", "u")
 }
 
@@ -236,7 +236,7 @@ isVowel <- function(x) {
 #' # Check if "banana" starts with a vowel
 #' startsWithVowel("banana")
 startsWithVowel <- function(x) {
-    assertthat::assert_that(is.character(x))
+    assert_that(is.character(x))
     isVowel(getChar(x, 1))
 }
 
@@ -256,7 +256,7 @@ startsWithVowel <- function(x) {
 #' # Prepend an indefinite article to "banana"
 #' prependIndefArticle("banana")
 prependIndefArticle <- function(x) {
-    assertthat::assert_that(is.character(x))
+    assert_that(is.character(x))
     paste0("a", ifelse(startsWithVowel(x), "n", ""), " ", x)
 }
 
@@ -277,7 +277,7 @@ pia <- prependIndefArticle
 #' # Remove spaces from "hello world"
 #' stripSpaces("hello world")
 stripSpaces <- function(x) {
-    assertthat::assert_that(is.character(x))
+    assert_that(is.character(x))
     gsub(" ", "", x)
 }
 
@@ -299,9 +299,9 @@ stripSpaces <- function(x) {
 #' closestWord("hello", c("hallo", "hullo", "hey"))
 closestWord <- function(s, strset, distFunc = utils::adist) {
 
-    assertthat::assert_that(is.character(s))
-    assertthat::assert_that(is.character(strset))
-    assertthat::assert_that(
+    assert_that(is.character(s))
+    assert_that(is.character(strset))
+    assert_that(
         is.function(distFunc) && (length(formals(distFunc)) >= 2)
     )
 
diff --git a/R/testing.R b/R/testing.R
index 4a01f0d..ccb90f8 100644
--- a/R/testing.R
+++ b/R/testing.R
@@ -39,8 +39,8 @@ initTestthat <- function(
     ignore = NULL
 ) {
 
-    assertthat::assert_that(is.character(rDir) && is.character(testDir))
-    assertthat::assert_that(is.null(ignore) || is.character(ignore))
+    assert_that(is.character(rDir) && is.character(testDir))
+    assert_that(is.null(ignore) || is.character(ignore))
 
     if (!dir.exists(testDir)) usethis::use_testthat()
     ignoreRegex <- encloseBr(paste(append(.ignore, ignore), collapse = ")|("))
diff --git a/R/validation.R b/R/validation.R
index 480db16..c497b06 100644
--- a/R/validation.R
+++ b/R/validation.R
@@ -5,7 +5,7 @@
 #' function is intended to slightly simplify cases where a long list of
 #' complex and convoluted predetermined checks are needed. For simpler cases
 #' like type checking, it is recommended to use [stopifnot()] or
-#' [assertthat::assert_that()].
+#' [assert_that()].
 #'
 #' @param obj The object to validate.
 #' @param checks A single function or list of functions, each taking the object
diff --git a/R/wrangling.R b/R/wrangling.R
index c29d34c..18d91f6 100644
--- a/R/wrangling.R
+++ b/R/wrangling.R
@@ -151,7 +151,7 @@ setRownames <- function(object, newRownames) {
 #' x %setNames% c("D", "E", "F")
 #'
 setNames <- function(object, newNames) {
-    assertthat::assert_that(
+    assert_that(
         length(newNames) == 1 || length(newNames) == length(object)
     )
     names(object) <- if (length(newNames) == length(object)) {
@@ -212,8 +212,8 @@ fixColnames <- function(
     unique = FALSE
 ) {
 
-    assertthat::assert_that(assertthat::is.string(invalidRegex))
-    assertthat::assert_that(assertthat::is.string(spacing))
+    assert_that(is.string(invalidRegex))
+    assert_that(is.string(spacing))
 
     subMap <- append(subMap, .subMap)
 
diff --git a/man/validateObject.Rd b/man/validateObject.Rd
index 05b2ce0..721655c 100644
--- a/man/validateObject.Rd
+++ b/man/validateObject.Rd
@@ -28,7 +28,7 @@ fails, an error handler is called and a default value is returned. This
 function is intended to slightly simplify cases where a long list of
 complex and convoluted predetermined checks are needed. For simpler cases
 like type checking, it is recommended to use \code{\link[=stopifnot]{stopifnot()}} or
-\code{\link[assertthat:assert_that]{assertthat::assert_that()}}.
+\code{\link[=assert_that]{assert_that()}}.
 }
 \examples{
 # Define some checks