diff --git a/tox.ini b/tox.ini
index 3745e8a..a1b2a4c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -15,6 +15,7 @@ deps =
     cocotb-test == 0.2.6
     cocotbext-axi == 0.1.24
     cocotbext-eth == 0.1.22
+    cocotbext-i2c == 0.1.0
     cocotbext-pcie == 0.2.14
     cocotbext-uart == 0.1.2
     scapy == 2.6.1