diff --git a/go.mod b/go.mod
index 292b559..bec3cf0 100644
--- a/go.mod
+++ b/go.mod
@@ -1,13 +1,17 @@
 module code.icb4dc0.de/buildr/common
 
-go 1.21
+go 1.23
 
-toolchain go1.21.0
+toolchain go1.23.1
 
 require (
 	code.icb4dc0.de/buildr/api v0.0.0-20230912160519-4b705a6732bc
-	connectrpc.com/connect v1.11.1
-	github.com/tetratelabs/wazero v1.5.0
+	connectrpc.com/connect v1.17.0
+	github.com/tetratelabs/wazero v1.8.0
 )
 
-require google.golang.org/protobuf v1.31.0 // indirect
+require (
+	github.com/google/go-cmp v0.6.0 // indirect
+	golang.org/x/net v0.29.0 // indirect
+	google.golang.org/protobuf v1.34.2 // indirect
+)
diff --git a/go.sum b/go.sum
index 2f0f6a8..8b2373b 100644
--- a/go.sum
+++ b/go.sum
@@ -1,16 +1,11 @@
-code.icb4dc0.de/buildr/api v0.0.0-20230905195458-e4d230e5c7fd h1:N4WkVoqphjFXfFwfKpLcEtS5lBCfd9NVytUutiszQ90=
-code.icb4dc0.de/buildr/api v0.0.0-20230905195458-e4d230e5c7fd/go.mod h1:eWSjeX25XbbNGKlxVoOf2a8V6xOCIaQh5W65T7nNcL8=
 code.icb4dc0.de/buildr/api v0.0.0-20230912160519-4b705a6732bc h1:NpOz5K0Oo/WFWBRsBKf92MTX9iW+sqaImwMuU33z6/s=
 code.icb4dc0.de/buildr/api v0.0.0-20230912160519-4b705a6732bc/go.mod h1:eWSjeX25XbbNGKlxVoOf2a8V6xOCIaQh5W65T7nNcL8=
-connectrpc.com/connect v1.11.1 h1:dqRwblixqkVh+OFBOOL1yIf1jS/yP0MSJLijRj29bFg=
-connectrpc.com/connect v1.11.1/go.mod h1:3AGaO6RRGMx5IKFfqbe3hvK1NqLosFNP2BxDYTPmNPo=
-github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
-github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
-github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-github.com/tetratelabs/wazero v1.5.0 h1:Yz3fZHivfDiZFUXnWMPUoiW7s8tC1sjdBtlJn08qYa0=
-github.com/tetratelabs/wazero v1.5.0/go.mod h1:0U0G41+ochRKoPKCJlh0jMg1CHkyfK8kDqiirMmKY8A=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
-google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+connectrpc.com/connect v1.17.0 h1:W0ZqMhtVzn9Zhn2yATuUokDLO5N+gIuBWMOnsQrfmZk=
+connectrpc.com/connect v1.17.0/go.mod h1:0292hj1rnx8oFrStN7cB4jjVBeqs+Yx5yDIC2prWDO8=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/tetratelabs/wazero v1.8.0 h1:iEKu0d4c2Pd+QSRieYbnQC9yiFlMS9D+Jr0LsRmcF4g=
+github.com/tetratelabs/wazero v1.8.0/go.mod h1:yAI0XTsMBhREkM/YDAK/zNou3GoiAce1P6+rp/wQhjs=
+golang.org/x/net v0.29.0 h1:5ORfpBpCs4HzDYoodCDBbwHzdR5UrLBZ3sOnUJmFoHo=
+golang.org/x/text v0.18.0 h1:XvMDiNzPAl0jr17s6W9lcaIhGUfUORdGCNsuLmPG224=
+google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
+google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=
diff --git a/wasirpc/host2module.go b/wasirpc/host2module.go
index 9a4bc6d..263969d 100644
--- a/wasirpc/host2module.go
+++ b/wasirpc/host2module.go
@@ -85,6 +85,9 @@ func (h *hostToModuleClient) Do(request *http.Request) (resp *http.Response, err
 		Status:     "200 OK",
 		StatusCode: http.StatusOK,
 		Request:    request,
+		Header: map[string][]string{
+			"Content-Type": {"application/proto"},
+		},
 	}
 
 	if len(results) == 0 {