diff --git a/haskell/repositories.bzl b/haskell/repositories.bzl
index 39d7e1363..12edf7b4f 100644
--- a/haskell/repositories.bzl
+++ b/haskell/repositories.bzl
@@ -121,10 +121,10 @@ def rules_haskell_dependencies():
     maybe(
         http_archive,
         name = "com_google_protobuf",
-        sha256 = "22fdaf641b31655d4b2297f9981fa5203b2866f8332d3c6333f6b0107bb320de",
-        strip_prefix = "protobuf-21.12",
+        sha256 = "c3a0a9ece8932e31c3b736e2db18b1c42e7070cd9b881388b26d01aa71e24ca2",
+        strip_prefix = "protobuf-31.1",
         urls = [
-            "https://github.com/protocolbuffers/protobuf/archive/refs/tags/v21.12.tar.gz",
+            "https://github.com/protocolbuffers/protobuf/archive/refs/tags/v31.1.tar.gz",
         ],
     )
 
diff --git a/rules_haskell_tests/MODULE.bazel b/rules_haskell_tests/MODULE.bazel
index 23244ce0b..96abba2fb 100644
--- a/rules_haskell_tests/MODULE.bazel
+++ b/rules_haskell_tests/MODULE.bazel
@@ -81,7 +81,7 @@ bazel_dep(
 )
 bazel_dep(
     name = "protobuf",
-    version = "21.7",
+    version = "31.1",
     repo_name = "com_google_protobuf",
 )
 bazel_dep(