diff --git a/bower.json b/bower.json
index 303c984b..7f510fa3 100644
--- a/bower.json
+++ b/bower.json
@@ -23,7 +23,7 @@
   ],
   "dependencies": {
     "sanctuary-def": "0.20.0",
-    "sanctuary-either": "1.1.0",
+    "sanctuary-either": "1.2.0",
     "sanctuary-maybe": "1.1.0",
     "sanctuary-pair": "1.2.0",
     "sanctuary-show": "1.0.0",
diff --git a/package.json b/package.json
index 57bbc0ba..2fbf17b5 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
   },
   "dependencies": {
     "sanctuary-def": "0.20.0",
-    "sanctuary-either": "1.1.0",
+    "sanctuary-either": "1.2.0",
     "sanctuary-maybe": "1.1.0",
     "sanctuary-pair": "1.2.0",
     "sanctuary-show": "1.0.0",