diff --git a/setup.py b/setup.py
index 1917e201b..dd725aeb6 100644
--- a/setup.py
+++ b/setup.py
@@ -276,7 +276,7 @@ setup(name="tahoe-lafs", # also set in __init__.py
               "tox",
               "foolscap[tor] >= 0.12.5",
               "txtorcon >= 0.17.0", # in case pip's resolver doesn't work
-              "foolscap[i2p]",
+              "foolscap[i2p] >= 0.12.6",
               "txi2p >= 0.3.1", # in case pip's resolver doesn't work
               "pytest",
               "pytest-twisted",
@@ -286,7 +286,7 @@ setup(name="tahoe-lafs", # also set in __init__.py
               "txtorcon >= 0.17.0", # in case pip's resolver doesn't work
           ],
           "i2p": [
-              "foolscap[i2p]",
+              "foolscap[i2p] >= 0.12.6",
               "txi2p >= 0.3.1", # in case pip's resolver doesn't work
           ],
       },