diff --git a/go.mod b/go.mod
index a2f3e77105ccadd3b4d0c8717cdc7ba65c2ca494..bf2823b149336f5cec98b9fb94b40e2ed6ff4a04 100644
--- a/go.mod
+++ b/go.mod
@@ -23,7 +23,7 @@ require (
 	github.com/google/go-cmp v0.6.0
 	github.com/google/uuid v1.6.0
 	github.com/grpc-ecosystem/go-grpc-middleware v1.4.0
-	github.com/grpc-ecosystem/go-grpc-middleware/v2 v2.2.0
+	github.com/grpc-ecosystem/go-grpc-middleware/v2 v2.1.0
 	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0
 	github.com/hashicorp/golang-lru/v2 v2.0.7
 	github.com/hashicorp/yamux v0.1.2-0.20220728231024-8f49b6f63f18
@@ -53,7 +53,10 @@ require (
 	golang.org/x/text v0.21.0
 	golang.org/x/time v0.7.0
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20240930140551-af27646dc61f
-	google.golang.org/grpc v1.68.1
+	// Please upgrade grpc-go with caution. Newer grpc-go versions contain some known issues:
+	// - https://gitlab.com/gitlab-com/request-for-help/-/issues/2127
+	// - https://gitlab.com/gitlab-org/gitaly/-/issues/6385
+	google.golang.org/grpc v1.66.3
 	google.golang.org/protobuf v1.35.2
 )
 
diff --git a/go.sum b/go.sum
index 150a5a7248a16351e16fb48bc7f5b59b74a2f37b..51029e3ccc068cebf70a15112d73d2167f678030 100644
--- a/go.sum
+++ b/go.sum
@@ -417,8 +417,8 @@ github.com/gorilla/sessions v1.2.1 h1:DHd3rPN5lE3Ts3D8rKkQ8x/0kqfeNmBAaiSi+o7Fsg
 github.com/gorilla/sessions v1.2.1/go.mod h1:dk2InVEVJ0sfLlnXv9EAgkf6ecYs/i80K/zI+bUmuGM=
 github.com/grpc-ecosystem/go-grpc-middleware v1.4.0 h1:UH//fgunKIs4JdUbpDl1VZCDaL56wXCB/5+wF6uHfaI=
 github.com/grpc-ecosystem/go-grpc-middleware v1.4.0/go.mod h1:g5qyo/la0ALbONm6Vbp88Yd8NsDy6rZz+RcrMPxvld8=
-github.com/grpc-ecosystem/go-grpc-middleware/v2 v2.2.0 h1:kQ0NI7W1B3HwiN5gAYtY+XFItDPbLBwYRxAqbFTyDes=
-github.com/grpc-ecosystem/go-grpc-middleware/v2 v2.2.0/go.mod h1:zrT2dxOAjNFPRGjTUe2Xmb4q4YdUwVvQFV6xiCSf+z0=
+github.com/grpc-ecosystem/go-grpc-middleware/v2 v2.1.0 h1:pRhl55Yx1eC7BZ1N+BBWwnKaMyD8uC+34TLdndZMAKk=
+github.com/grpc-ecosystem/go-grpc-middleware/v2 v2.1.0/go.mod h1:XKMd7iuf/RGPSMJ/U4HP0zS2Z9Fh8Ps9a+6X26m/tmI=
 github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0 h1:Ovs26xHkKqVztRpIrF/92BcuyuQ/YW4NSIpoGtfXNho=
 github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0/go.mod h1:8NvIoxWQoOIhqOTXgfV/d3M/q6VIi02HzZEHgUlZvzk=
 github.com/grpc-ecosystem/grpc-gateway v1.16.0/go.mod h1:BDjrQk3hbvj6Nolgz8mAMFbcEtjT1g+wF4CSlocrBnw=
@@ -1139,8 +1139,8 @@ google.golang.org/grpc v1.37.1/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQ
 google.golang.org/grpc v1.38.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
 google.golang.org/grpc v1.39.0/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnDzfrE=
 google.golang.org/grpc v1.39.1/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnDzfrE=
-google.golang.org/grpc v1.68.1 h1:oI5oTa11+ng8r8XMMN7jAOmWfPZWbYpCFaMUTACxkM0=
-google.golang.org/grpc v1.68.1/go.mod h1:+q1XYFJjShcqn0QZHvCyeR4CXPA+llXIeUIfIe00waw=
+google.golang.org/grpc v1.66.3 h1:TWlsh8Mv0QI/1sIbs1W36lqRclxrmF+eFJ4DbI0fuhA=
+google.golang.org/grpc v1.66.3/go.mod h1:s3/l6xSSCURdVfAnL+TqCNMyTDAGN6+lZeVxnZR128Y=
 google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0/go.mod h1:6Kw0yEErY5E/yWrBtf03jp27GLLJujG4z/JK95pnjjw=
 google.golang.org/grpc/stats/opentelemetry v0.0.0-20240907200651-3ffb98b2c93a h1:UIpYSuWdWHSzjwcAFRLjKcPXFZVVLXGEM23W+NWqipw=
 google.golang.org/grpc/stats/opentelemetry v0.0.0-20240907200651-3ffb98b2c93a/go.mod h1:9i1T9n4ZinTUZGgzENMi8MDDgbGC5mqTS75JAv6xN3A=