diff --git a/CHANGELOG b/CHANGELOG
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,8 @@
 # Changelog
 
+- 0.4.1 (2025-12-28)
+  * Bumps the ppad-fixed lower-bound version and tests with GHC 9.10.3.
+
 - 0.4.0 (2025-12-27)
   * Switches from variable-size 'Integer' to fixed-width words and
     constant-time primitives supplied by ppad-fixed. The implementation now
diff --git a/ppad-poly1305.cabal b/ppad-poly1305.cabal
--- a/ppad-poly1305.cabal
+++ b/ppad-poly1305.cabal
@@ -1,6 +1,6 @@
 cabal-version:      3.0
 name:               ppad-poly1305
-version:            0.4.0
+version:            0.4.1
 synopsis:           A pure Poly1305 MAC
 license:            MIT
 license-file:       LICENSE
@@ -8,7 +8,7 @@
 maintainer:         jared@ppad.tech
 category:           Cryptography
 build-type:         Simple
-tested-with:        GHC == 9.8.1
+tested-with:        GHC == 9.10.3
 extra-doc-files:    CHANGELOG
 description:
   A pure Poly1305 message authentication code, per
@@ -35,7 +35,7 @@
   build-depends:
       base >= 4.9 && < 5
     , bytestring >= 0.9 && < 0.13
-    , ppad-fixed >= 0.1 && < 0.2
+    , ppad-fixed >= 0.1.3 && < 0.2
 
 test-suite poly1305-tests
   type:                exitcode-stdio-1.0