diff --git a/packages/cactus-plugin-ledger-connector-besu/src/main/json/openapi.json b/packages/cactus-plugin-ledger-connector-besu/src/main/json/openapi.json
index 706be9574a2..c675259cf81 100644
--- a/packages/cactus-plugin-ledger-connector-besu/src/main/json/openapi.json
+++ b/packages/cactus-plugin-ledger-connector-besu/src/main/json/openapi.json
@@ -369,6 +369,7 @@
                     "blockConfirmations": {
                         "type": "integer",
                         "minimum": 0,
+                        "maximum": 20000,
                         "description": "The number of blocks to wait to be confirmed in addition to the block containing the transaction in question. Note that if the receipt type is set to only wait for node transaction pool ACK and this parameter is set to anything, but zero then the API will not accept the request due to conflicting parameters."
                     }
                 }
diff --git a/packages/cactus-plugin-ledger-connector-xdai/src/main/json/openapi.json b/packages/cactus-plugin-ledger-connector-xdai/src/main/json/openapi.json
index 0b11c461e63..431087ec1b6 100644
--- a/packages/cactus-plugin-ledger-connector-xdai/src/main/json/openapi.json
+++ b/packages/cactus-plugin-ledger-connector-xdai/src/main/json/openapi.json
@@ -34,6 +34,7 @@
                     "blockConfirmations": {
                         "type": "integer",
                         "minimum": 0,
+                        "maximum": 20000,
                         "description": "The number of blocks to wait to be confirmed in addition to the block containing the transaction in question. Note that if the receipt type is set to only wait for node transaction pool ACK and this parameter is set to anything, but zero then the API will not accept the request due to conflicting parameters."
                     },
                     "pollIntervalMs" : {