diff --git a/kubeflow/core/tests/util_test.jsonnet b/kubeflow/core/tests/util_test.jsonnet
index 8fc7f6b3a69..6509d063245 100644
--- a/kubeflow/core/tests/util_test.jsonnet
+++ b/kubeflow/core/tests/util_test.jsonnet
@@ -1,9 +1,5 @@
 local util = import "../util.libsonnet";
 
-std.assertEqual(util.upper("True"), "TRUE") &&
-std.assertEqual(util.upper("TrUe"), "TRUE") &&
-std.assertEqual(util.upper("true"), "TRUE") &&
-std.assertEqual(util.upper("TRUE"), "TRUE") &&
 std.assertEqual(util.lower("aTruez"), "atruez") &&
 std.assertEqual(util.lower("ATrUez"), "atruez") &&
 std.assertEqual(util.lower("atruez"), "atruez") &&
@@ -25,8 +21,6 @@ std.assertEqual(util.toArray("ca, or,fl, mo"), ["ca", "or", "fl", "mo"]) &&
 std.assertEqual(std.length(util.toArray(2)), 0) &&
 std.assertEqual(std.length(util.toArray("hello world")), 1) &&
 std.assertEqual(std.length(util.toArray([1, 2, 3, 4])), 0) &&
-std.assertEqual(util.isUpper(std.substr("Hi", 0, 1)), true) &&
-std.assertEqual(util.isUpper(std.substr("lo", 0, 1)), false) &&
 std.assertEqual(util.sort(["Craydad", "CCall", "crayon"]), ["CCall", "Craydad", "crayon"]) &&
 std.assertEqual(
   {
diff --git a/kubeflow/core/util.libsonnet b/kubeflow/core/util.libsonnet
index a41fa9b04ba..0ecb872345f 100644
--- a/kubeflow/core/util.libsonnet
+++ b/kubeflow/core/util.libsonnet
@@ -3,26 +3,6 @@
   local k = import "k.libsonnet",
   local util = self,
 
-  // Is the character upper case?
-  isUpper:: function(c) {
-    local cp = std.codepoint,
-    local value = if cp(c) >= 65 && cp(c) < 91 then
-      true
-    else
-      false,
-    result:: value,
-  }.result,
-
-  // TODO(https://github.com/kubeflow/kubeflow/issues/1826): Replace with std.asciiUpper once supported by required version of jsonnet
-  // Convert a string to upper case.
-  upper:: function(x) {
-    local cp(c) = std.codepoint(c),
-    local upperLetter(c) = if cp(c) >= 97 && cp(c) < 123 then
-      std.char(cp(c) - 32)
-    else c,
-    result:: std.join("", std.map(upperLetter, std.stringChars(x))),
-  }.result,
-
   // Convert a string to lower case.
   lower:: function(x) {
     local cp(c) = std.codepoint(c),
@@ -39,7 +19,7 @@
       if std.type(x) == "boolean" then
         x
       else if std.type(x) == "string" then
-        $.upper(x) == "TRUE"
+        std.asciiUpper(x) == "TRUE"
       else if std.type(x) == "number" then
         x != 0
       else
diff --git a/kubeflow/openmpi/util.libsonnet b/kubeflow/openmpi/util.libsonnet
index a597e8468a9..2f1cd7527a7 100644
--- a/kubeflow/openmpi/util.libsonnet
+++ b/kubeflow/openmpi/util.libsonnet
@@ -15,16 +15,6 @@
       for keyValue in $.toArray(str)
     } else {},
 
-  // TODO(https://github.com/kubeflow/kubeflow/issues/1826): Replace with std.asciiUpper once supported by required version of jsonnet
-  // Convert a string to upper case.
-  upper:: function(x) {
-    local cp(c) = std.codepoint(c),
-    local upLetter(c) = if cp(c) >= 97 && cp(c) < 123 then
-      std.char(cp(c) - 32)
-    else c,
-    result:: std.join("", std.map(upLetter, std.stringChars(x))),
-  }.result,
-
   // Convert non-boolean types like string,number to a boolean.
   // This is primarily intended for dealing with parameters that should be booleans.
   toBool:: function(x) {
@@ -32,7 +22,7 @@
       if std.type(x) == "boolean" then
         x
       else if std.type(x) == "string" then
-        $.upper(x) == "TRUE"
+        std.asciiUpper(x) == "TRUE"
       else if std.type(x) == "number" then
         x != 0
       else
diff --git a/kubeflow/weaveflux/util.libsonnet b/kubeflow/weaveflux/util.libsonnet
index c3b07c3aa04..c523be33ae3 100644
--- a/kubeflow/weaveflux/util.libsonnet
+++ b/kubeflow/weaveflux/util.libsonnet
@@ -1,15 +1,5 @@
 // Some useful routines.
 {
-  // TODO(https://github.com/kubeflow/kubeflow/issues/1826): Replace with std.asciiUpper once supported by required version of jsonnet
-  // Convert a string to upper case.
-  upper:: function(x) {
-    local cp(c) = std.codepoint(c),
-    local upLetter(c) = if cp(c) >= 97 && cp(c) < 123 then
-      std.char(cp(c) - 32)
-    else c,
-    result:: std.join("", std.map(upLetter, std.stringChars(x))),
-  }.result,
-
   // Convert non-boolean types like string,number to a boolean.
   // This is primarily intended for dealing with parameters that should be booleans.
   toBool:: function(x) {
@@ -17,7 +7,7 @@
       if std.type(x) == "boolean" then
         x
       else if std.type(x) == "string" then
-        $.upper(x) == "TRUE"
+        std.asciiUpper(x) == "TRUE"
       else if std.type(x) == "number" then
         x != 0
       else
diff --git a/testing/workflows/components/workflows.libsonnet b/testing/workflows/components/workflows.libsonnet
index 54b02287db3..bd82dcd97da 100644
--- a/testing/workflows/components/workflows.libsonnet
+++ b/testing/workflows/components/workflows.libsonnet
@@ -23,7 +23,7 @@
       if std.type(x) == "boolean" then
         x
       else if std.type(x) == "string" then
-        $.upper(x) == "TRUE"
+        std.asciiUpper(x) == "TRUE"
       else if std.type(x) == "number" then
         x != 0
       else