diff --git a/cabal.project.ghc-head b/cabal.project.ghc-head
index 8e9f80a0..79cfe64c 100644
--- a/cabal.project.ghc-head
+++ b/cabal.project.ghc-head
@@ -24,6 +24,12 @@ active-repositories: hackage.haskell.org, head.hackage.ghc.haskell.org:override
 source-repository-package
   type: git
   location: https://github.com/composewell/fusion-plugin
-  tag: 25aa89c97aaaf83209d4282638ef774780061366
+  tag: 3c6535a7027d60d88c37b9a601cb180b805e7431
+
+source-repository-package
+  type: git
+  location: https://github.com/rrnewton/haskell-lockfree
+  tag: 00a70cfe74994b41eb3627c752170d1e82118a8e
+  subdir: lockfree-queue
 
 allow-newer: all
diff --git a/stack.yaml b/stack.yaml
index 62fec35b..0c77f3fb 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -8,6 +8,7 @@ packages:
 extra-deps:
   - unicode-data-0.2.0
   - tasty-bench-0.3.1
+  - lockfree-queue-0.2.4
 
 #allow-newer: true
 rebuild-ghc-options: true