diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
index 8d3eb8d6..cb66c1df 100644
--- a/.github/workflows/pull-request.yml
+++ b/.github/workflows/pull-request.yml
@@ -41,7 +41,7 @@ jobs:
           SKIP_TESTS: true
       - id: published-version
         run: echo "::set-output name=version::$(cat lerna.json | jq -r '.version')"
-      - uses: kyranjamie/pull-request-fixed-header@v1.0.1
+      - uses: janniks/pull-request-fixed-header@v1.0.1
         with:
           header: "> This PR was published to npm with the version `${{ steps.published-version.outputs.version }}`\n> e.g. `npm install @stacks/common@${{ steps.published-version.outputs.version }} --save-exact`"
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/packages/common/src/buffer.ts b/packages/common/src/buffer.ts
index ede4d62f..67b5869a 100644
--- a/packages/common/src/buffer.ts
+++ b/packages/common/src/buffer.ts
@@ -1,5 +1,3 @@
-import { isEnum } from './enum';
-
 /** @ignore */
 export function equals(a: Uint8Array, b: Uint8Array) {
   if (a.byteLength !== b.byteLength) return false;
@@ -21,20 +19,6 @@ export function alloc(length: number, value: number) {
   return a;
 }
 
-/** @ignore */
-export function readUInt8Enum<T extends string, TEnumValue extends number>(
-  source: Uint8Array,
-  offset: number,
-  enumVariable: { [key in T]: TEnumValue },
-  invalidEnumErrorFormatter: (val: number) => Error
-): TEnumValue {
-  const num = readUInt8(source, offset);
-  if (isEnum(enumVariable, num)) {
-    return num;
-  }
-  throw invalidEnumErrorFormatter(num);
-}
-
 /** @ignore */
 export function readUInt16BE(source: Uint8Array, offset: number): number {
   return ((source[offset + 0] << 8) | source[offset + 1]) >>> 0;
diff --git a/packages/common/src/enum.ts b/packages/common/src/enum.ts
deleted file mode 100644
index 5c0aa106..00000000
--- a/packages/common/src/enum.ts
+++ /dev/null
@@ -1,40 +0,0 @@
-function createEnumChecker<T extends string, TEnumValue extends number>(enumVariable: {
-  [key in T]: TEnumValue;
-}): (value: number) => value is TEnumValue {
-  // Create a set of valid enum number values.
-  const enumValues = Object.values<number>(enumVariable).filter(v => typeof v === 'number');
-  const enumValueSet = new Set<number>(enumValues);
-  return (value: number): value is TEnumValue => enumValueSet.has(value);
-}
-
-const enumCheckFunctions = new Map<object, (value: number) => boolean>();
-
-/**
- * Type guard to check if a given value is a valid enum value.
- * @param enumVariable - Literal `enum` type.
- * @param value - A value to check against the enum's values.
- * @example
- * ```ts
- * enum Color {
- *   Purple = 3,
- *   Orange = 5
- * }
- * const val: number = 3;
- * if (isEnum(Color, val)) {
- *   // `val` is known as enum type `Color`, e.g.:
- *   const colorVal: Color = val;
- * }
- * ```
- */
-export function isEnum<T extends string, TEnumValue extends number>(
-  enumVariable: { [key in T]: TEnumValue },
-  value: number
-): value is TEnumValue {
-  const checker = enumCheckFunctions.get(enumVariable);
-  if (checker !== undefined) {
-    return checker(value);
-  }
-  const newChecker = createEnumChecker(enumVariable);
-  enumCheckFunctions.set(enumVariable, newChecker);
-  return isEnum(enumVariable, value);
-}
diff --git a/packages/common/src/index.ts b/packages/common/src/index.ts
index 4883c8a4..d4e02759 100644
--- a/packages/common/src/index.ts
+++ b/packages/common/src/index.ts
@@ -6,4 +6,3 @@ export * from './constants';
 export * from './signatures';
 export * from './keys';
 export * from './buffer';
-export * from './enum';