diff --git a/Dockerfile b/Dockerfile
index 1666a08..4dc107f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,6 +6,7 @@ ENV RUSTUP_HOME=/usr/local/rustup \
     PATH=/usr/local/cargo/bin:$PATH \
     RUST_VERSION=1.76.0
 
+ARG DEBIAN_FRONTEND=noninteractive
 RUN <<EOF
 set -e
 apt update
@@ -16,7 +17,7 @@ apt install -y --no-install-recommends \
     wget=1.21.2-2ubuntu1 \
     libclang-dev
 EOF
-# libclang-dev is required to build and link the rust-rocksdb crate for riscv64
+# libclang needed to build rocksdb. Can remove once this is no longer needed.
 
 RUN set -eux; \
     dpkgArch="$(dpkg --print-architecture)"; \
@@ -54,21 +55,30 @@ FROM base as builder
 COPY --from=planner /opt/cartesi/cartezcash/recipe.json recipe.json
 RUN cargo chef cook --release --recipe-path recipe.json  --target riscv64gc-unknown-linux-gnu
 COPY . .
-RUN cargo build --release  --target riscv64gc-unknown-linux-gnu
+RUN cargo build --release --target riscv64gc-unknown-linux-gnu
 
 ### final image is the dapp itself
 
 FROM --platform=linux/riscv64 riscv64/ubuntu:22.04
 
-LABEL io.sunodo.sdk_version=0.3.0
-LABEL io.cartesi.rollups.ram_size=128Mi
-
-ARG MACHINE_EMULATOR_TOOLS_VERSION=0.12.0
-
+ARG MACHINE_EMULATOR_TOOLS_VERSION=0.14.1
 ADD https://github.com/cartesi/machine-emulator-tools/releases/download/v${MACHINE_EMULATOR_TOOLS_VERSION}/machine-emulator-tools-v${MACHINE_EMULATOR_TOOLS_VERSION}.deb /
 RUN dpkg -i /machine-emulator-tools-v${MACHINE_EMULATOR_TOOLS_VERSION}.deb \
     && rm /machine-emulator-tools-v${MACHINE_EMULATOR_TOOLS_VERSION}.deb
 
+LABEL io.sunodo.sdk_version=0.4.0
+LABEL io.cartesi.rollups.ram_size=256Mi
+
+ARG DEBIAN_FRONTEND=noninteractive
+RUN <<EOF
+set -e
+apt-get update
+apt-get install -y --no-install-recommends \
+    busybox-static=1:1.30.1-7ubuntu3
+rm -rf /var/lib/apt/lists/* /var/log/* /var/cache/*
+useradd --create-home --user-group dapp
+EOF
+
 ENV PATH="/opt/cartesi/bin:/opt/cartesi/cartezcash:${PATH}"
 
 WORKDIR /opt/cartesi/cartezcash
diff --git a/tower-cartesi/src/lib.rs b/tower-cartesi/src/lib.rs
index e9f791a..2d9ee46 100644
--- a/tower-cartesi/src/lib.rs
+++ b/tower-cartesi/src/lib.rs
@@ -35,9 +35,7 @@ where
     let mut response = Response::empty_accept();
     loop {
         // set the finish message and get the new request
-        let finish_http_request = response
-            .finish_message()
-            .build_http_request(host_uri.try_into()?);
+        let finish_http_request = response.finish_message().build_http_request(host_uri);
         let resp = client.request(finish_http_request).await?;
         if resp.status() == hyper::StatusCode::ACCEPTED {
             tracing::info!("No pending rollup request, trying again");
@@ -53,9 +51,7 @@ where
         // handle the additional calls as required by the dApp outputs
         for output in response.outputs.iter() {
             tracing::info!("Sending output {:?}", output);
-            let resp = client
-                .request(output.build_http_request(host_uri.try_into()?))
-                .await?;
+            let resp = client.request(output.build_http_request(host_uri)).await?;
             tracing::info!("Output response: {:?}", resp.status());
         }
     }
diff --git a/tower-cartesi/src/messages.rs b/tower-cartesi/src/messages.rs
index b59c556..47688d2 100644
--- a/tower-cartesi/src/messages.rs
+++ b/tower-cartesi/src/messages.rs
@@ -1,4 +1,3 @@
-use hyper::Uri;
 use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Serialize)]
@@ -26,7 +25,7 @@ impl Finish {
         }
     }
 
-    pub fn build_http_request(&self, host_uri: Uri) -> hyper::Request<hyper::Body> {
+    pub fn build_http_request(&self, host_uri: &str) -> hyper::Request<hyper::Body> {
         let finish_uri = format!("{}/finish", host_uri);
 
         hyper::Request::builder()
@@ -91,7 +90,7 @@ where
 }
 
 impl Output {
-    pub fn build_http_request(&self, host_uri: Uri) -> hyper::Request<hyper::Body> {
+    pub fn build_http_request(&self, host_uri: &str) -> hyper::Request<hyper::Body> {
         let uri = match self {
             Self::Notice { .. } => format!("{}/notice", host_uri),
             Self::Report { .. } => format!("{}/report", host_uri),