diff --git a/go.mod b/go.mod
index c652f977e..1485a6081 100644
--- a/go.mod
+++ b/go.mod
@@ -527,3 +527,19 @@ replace github.com/apache/thrift => github.com/apache/thrift v0.23.1-0.202604291
 // through rclone's internxt backend, which calls IsMnemonicValid and NewSeed.
 // cosmos/go-bip39 is a maintained, API-compatible fork.
 replace github.com/tyler-smith/go-bip39 => github.com/cosmos/go-bip39 v1.0.0
+
+// grpc-go v1.82.1 started counting registerStream/cleanupStream toward the
+// control-buffer throttle limit. Those are per-RPC bookkeeping items that emit
+// no wire traffic, so a connection carrying enough concurrent RPCs latches
+// throttling in both directions at once and deadlocks for good: both peers stop
+// reading, both loopyWriters block writing to a full socket.
+//
+// It triggers whenever the socket send buffer is too small to absorb the burst
+// loopyWriter emits for the in-flight streams, so it is about buffer size, not
+// transport: TCP forced to a 64KB buffer deadlocks, a Unix socket with a 2MB
+// buffer does not. Local gRPC rides Unix sockets, whose buffers are small and
+// fixed (208KB on Linux, 8KB on macOS), which is why weed mini wedges under
+// concurrent S3 writes; a remote filer over TCP is exposed too wherever
+// send buffers are constrained. Pin to the last unaffected release until
+// grpc/grpc-go#9330 is fixed.
+replace google.golang.org/grpc => google.golang.org/grpc v1.82.0
diff --git a/go.sum b/go.sum
index 83731e42a..7fd559443 100644
--- a/go.sum
+++ b/go.sum
@@ -2838,6 +2838,8 @@ google.golang.org/grpc v1.51.0/go.mod h1:wgNDFcnuBGmxLKI/qn4T+m5BtEBYXJPvibbUPsA
 google.golang.org/grpc v1.52.0/go.mod h1:pu6fVzoFb+NBYNAvQL08ic+lvB2IojljRYuun5vorUY=
 google.golang.org/grpc v1.53.0/go.mod h1:OnIrk0ipVdj4N5d9IUoFUx72/VlD7+jUsHwZgwSMQpw=
 google.golang.org/grpc v1.55.0/go.mod h1:iYEXKGkEBhg1PjZQvoYEVPTDkHo1/bjTnfwTeGONTY8=
+google.golang.org/grpc v1.82.0 h1:vguDnZUPjE26w09A63VoxZPnvPjB5Riyc0mkXPFmAIU=
+google.golang.org/grpc v1.82.0/go.mod h1:yzTZ1TB1Z3SG+LIYaI+WiE8D5+PZ3ArnrSp8zF3+/ZA=
 google.golang.org/grpc v1.84.0-dev.0.20260723093437-b6eac429d7b6 h1:HfjjkdGIa8u9sP9EW5WCygy0kQDuTI/Tax4j//t24Fo=
 google.golang.org/grpc v1.84.0-dev.0.20260723093437-b6eac429d7b6/go.mod h1:ljCht0DrxQrXBDRTZp52Qxh3Ffk8CdYm2sj4O2QN2C0=
 google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0/go.mod h1:6Kw0yEErY5E/yWrBtf03jp27GLLJujG4z/JK95pnjjw=