diff --git a/python/requirements-optional.txt b/python/requirements-optional.txt
index cd93c7675..21a4f9367 100644
--- a/python/requirements-optional.txt
+++ b/python/requirements-optional.txt
@@ -2,4 +2,4 @@ hidapi >= 0.7.99.post20
 rlp >= 1.1.0
 web3 >= 4.8
 Pillow
-stellar-sdk>=4.0.0,<5.0.0
+stellar-sdk>=4.0.0,<6.0.0
diff --git a/python/setup.py b/python/setup.py
index 3c49b9ada..425310240 100755
--- a/python/setup.py
+++ b/python/setup.py
@@ -22,7 +22,7 @@ extras_require = {
     "ethereum": ["rlp>=1.1.0", "web3>=4.8"],
     "qt-widgets": ["PyQt5"],
     "extra": ["Pillow"],
-    "stellar": ["stellar-sdk>=4.0.0,<5.0.0"],
+    "stellar": ["stellar-sdk>=4.0.0,<6.0.0"],
 }
 
 extras_require["full"] = sum(extras_require.values(), [])
diff --git a/python/src/trezorlib/stellar.py b/python/src/trezorlib/stellar.py
index 3b86413a7..d6c4ad156 100644
--- a/python/src/trezorlib/stellar.py
+++ b/python/src/trezorlib/stellar.py
@@ -271,7 +271,7 @@ def _read_amount(amount: str) -> int:
 
 
 def _read_price(price: Union["Price", str, Decimal]) -> "Price":
-    # In the coming stellar-sdk 5.x, the type of price must be Price,
+    # In the coming stellar-sdk 6.x, the type of price must be Price,
     # at that time we can remove this function
     if isinstance(price, Price):
         return price