diff --git a/cabal.project b/cabal.project
index c68efc4..4e660a5 100644
--- a/cabal.project
+++ b/cabal.project
@@ -1,6 +1,6 @@
 index-state:
   -- Bump this if you need newer packages from Hackage
-  , hackage.haskell.org 2024-10-02T00:00:00Z
+  , hackage.haskell.org 2024-12-09T15:45:06Z
 
 packages:
   fs-api
diff --git a/fs-sim/CHANGELOG.md b/fs-sim/CHANGELOG.md
index c0d4697..6991adc 100644
--- a/fs-sim/CHANGELOG.md
+++ b/fs-sim/CHANGELOG.md
@@ -1,11 +1,16 @@
 # Revision history for fs-sim
 
-## Next version -- ????-??-??
+## 0.3.1.0 -- 2024-12-10
 
 ### Non-breaking
 
 * Expose `openHandles` for testing.
 
+### Patch
+
+* Make `genInfinite` generate truly infinite streams.
+* The shrinker for `Errors` now truly shrinks towards empty errors.
+
 ## 0.3.0.1 -- 2024-10-02
 
 ### Patch
diff --git a/fs-sim/fs-sim.cabal b/fs-sim/fs-sim.cabal
index aa8c36d..c17eca5 100644
--- a/fs-sim/fs-sim.cabal
+++ b/fs-sim/fs-sim.cabal
@@ -1,6 +1,6 @@
 cabal-version:   3.0
 name:            fs-sim
-version:         0.3.0.1
+version:         0.3.1.0
 synopsis:        Simulated file systems
 description:     Simulated file systems.
 license:         Apache-2.0