diff --git a/DESCRIPTION b/DESCRIPTION
index 7e60fe1e..1f530136 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,5 +1,5 @@
 Package: AMR
-Version: 1.8.1.9065
+Version: 1.8.1.9066
 Date: 2022-09-23
 Title: Antimicrobial Resistance Data Analysis
 Description: Functions to simplify and standardise antimicrobial resistance (AMR)
diff --git a/NEWS.md b/NEWS.md
index 891bbac2..554b4ea4 100755
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,4 +1,4 @@
-# AMR 1.8.1.9065
+# AMR 1.8.1.9066
 
 This version will eventually become v2.0! We're happy to reach a new major milestone soon!
 
diff --git a/inst/tinytest/test-mo.R b/inst/tinytest/test-mo.R
index 30ae419a..bf155894 100644
--- a/inst/tinytest/test-mo.R
+++ b/inst/tinytest/test-mo.R
@@ -307,8 +307,6 @@ expect_equal(
   rep("UNKNOWN", 3)
 )
 
-expect_null(mo_failures())
-
 expect_error(translate_allow_uncertain(5))
 
 # debug mode
diff --git a/tests/tinytest.R b/tests/tinytest.R
index c425a946..ac9fd997 100644
--- a/tests/tinytest.R
+++ b/tests/tinytest.R
@@ -38,11 +38,25 @@ if (identical(Sys.getenv("R_RUN_TINYTEST"), "true")) {
     set_AMR_locale("English")
     # get dir.exists(), trimws() and strrep() if on old R
     if (getRversion() < "3.2.0") {
+      anyNA <- AMR:::anyNA
       dir.exists <- AMR:::dir.exists
+      file.size <- AMR:::file.size
+      file.mtime <- AMR:::file.mtime
+      isNamespaceLoaded <- AMR:::isNamespaceLoaded
+      lengths <- AMR:::lengths
     }
     if (getRversion() < "3.3.0") {
-      trimws <- AMR:::trimws
       strrep <- AMR:::strrep
+      trimws <- AMR:::trimws
+    }
+    if (getRversion() < "3.4.2") {
+      isFALSE <- AMR:::isFALSE
+    }
+    if (getRversion() < "3.6.0") {
+      str2lang <- AMR:::str2lang
+    }
+    if (getRversion() < "4.0.0") {
+      deparse1 <- AMR:::deparse1
     }
     # start the unit tests
     out <- test_package("AMR",