diff --git a/Cargo.toml b/Cargo.toml
index 58c5040..c139b19 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,6 @@
 [workspace]
+exclude = ["keccak"] # TODO(tarcieri): add back to `members` when MSRV >= 1.56
 members = [
     "ascon",
-    "keccak",
+    #"keccak",
 ]
diff --git a/keccak/Cargo.lock b/keccak/Cargo.lock
index e99a5d2..4b3e05d 100644
--- a/keccak/Cargo.lock
+++ b/keccak/Cargo.lock
@@ -13,7 +13,7 @@ dependencies = [
 
 [[package]]
 name = "keccak"
-version = "0.1.2"
+version = "0.1.3"
 dependencies = [
  "cpufeatures",
 ]