diff --git a/DESCRIPTION b/DESCRIPTION
index 85aed29..64b028f 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: ottr
 Title: An R Autograding Extension for Otter-Grader
-Version: 1.3.0
+Version: 1.3.1
 Authors@R: c(
     person(given = "Christopher",
            family = "Pyles",
@@ -16,7 +16,7 @@ Description:
 License: BSD_3_clause + file LICENSE
 Encoding: UTF-8
 Roxygen: list(markdown = TRUE)
-RoxygenNote: 7.2.1
+RoxygenNote: 7.2.3
 Depends:
     R (>= 4.0.0)
 Imports:
diff --git a/NAMESPACE b/NAMESPACE
index a6cee70..df94e02 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -5,3 +5,5 @@ export(check)
 export(export)
 export(run_autograder)
 export(valid_syntax)
+importFrom(R6,R6Class)
+importFrom(jsonlite,toJSON)
diff --git a/R/GradingResults.R b/R/GradingResults.R
index f870ab7..d1a50d9 100644
--- a/R/GradingResults.R
+++ b/R/GradingResults.R
@@ -44,6 +44,8 @@ GradingResults <- R6::R6Class(
 
     #' @description Export these results to a JSON string.
     #'
+    #' @importFrom jsonlite toJSON
+    #'
     #' @return The JSON string
     to_json = function() {
       return(jsonlite::toJSON(self$to_list(), auto_unbox = TRUE, pretty = TRUE, null = "null"))
diff --git a/R/TestCase.R b/R/TestCase.R
index e332b6f..f27bc68 100644
--- a/R/TestCase.R
+++ b/R/TestCase.R
@@ -9,6 +9,8 @@
 #' @field success_message A message to show to students if the test passes
 #' @field failure_message A message to show to students if the test fails
 #'
+#' @importFrom R6 R6Class
+#'
 #' @export
 #'
 #' @examples