diff --git a/hledger-web/package.yaml b/hledger-web/package.yaml
index d9ba5a218..4d325d0a3 100644
--- a/hledger-web/package.yaml
+++ b/hledger-web/package.yaml
@@ -94,7 +94,7 @@ library:
   - hledger-lib >=1.32.99 && <1.33
   - hledger >=1.32.99 && <1.33
   - aeson >=1 && <2.3
-  - base64
+  - base64 <1
   - blaze-html
   - blaze-markup
   - bytestring