diff --git a/.changeset/bitter-items-battle.md b/.changeset/bitter-items-battle.md
new file mode 100644
index 0000000..a6c2be1
--- /dev/null
+++ b/.changeset/bitter-items-battle.md
@@ -0,0 +1,5 @@
+---
+"@labdigital/federated-token": patch
+---
+
+Resolved encoding issue for token data with special encoded characters
diff --git a/packages/core/src/token.ts b/packages/core/src/token.ts
index b4016be..c648dc3 100644
--- a/packages/core/src/token.ts
+++ b/packages/core/src/token.ts
@@ -141,7 +141,7 @@ export class FederatedToken {
 	// as received from downstream services
 	deserializeAccessToken(at: string, trackModified = false) {
 		const token: FederatedTokenValue = JSON.parse(
-			Buffer.from(at, "base64").toString("ascii"),
+			Buffer.from(at, "base64").toString(),
 		);
 
 		if (trackModified) {
@@ -174,7 +174,7 @@ export class FederatedToken {
 
 	loadRefreshToken(value: string, trackModified = false) {
 		const refreshTokens: Record<string, string> = JSON.parse(
-			Buffer.from(value, "base64").toString("ascii"),
+			Buffer.from(value, "base64").toString(),
 		);
 
 		// TODO: Validate json