diff --git a/repo2docker/buildpacks/r.py b/repo2docker/buildpacks/r.py
index b1bfcdef..d2489778 100644
--- a/repo2docker/buildpacks/r.py
+++ b/repo2docker/buildpacks/r.py
@@ -75,7 +75,7 @@ class RBuildPack(PythonBuildPack):
             "3.5.3": "3.5.3-1bionic",
             "3.6": "3.6.3-1bionic",
             "3.6.0": "3.6.0-2bionic",
-            "3.6.1": "3.6.1-1bionic",
+            "3.6.1": "3.6.1-3bionic",
             "4.0": "4.0.5-1.1804.0",
             "4.0.2": "4.0.2-1.1804.0",
             "4.1": "4.1.2-1.1804.0",