diff --git a/CHECKSUM_SHA512 b/CHECKSUM_SHA512
index 601bf4f..175dc13 100644
--- a/CHECKSUM_SHA512
+++ b/CHECKSUM_SHA512
@@ -1 +1 @@
-5f756da4d2df59c69997925c69f651011def07bfbdbc582f492ecc19386eee7d79b9951732a792e6041da902d776052d6590cbd2d7004bc93c8406bcf9093fe6
+980dfab33f7ae1dfb2f9e77272d00919224b7d4267d5f9a298ba082779ef5cc10260926dd5ad75f6ff54c1b5f451bbe4ee3d0c3908db5b54b3546cb5e9ec49f6
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index 4600e3e..684aa8e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -32,11 +32,11 @@ RUN mkdir -p /data ${ELECTRUM_HOME} && \
 ENV ELECTRUM_CHECKSUM_SHA512 $CHECKSUM_SHA512
 
 RUN adduser -D $ELECTRUM_USER && \
-    apk --no-cache add --virtual build-dependencies gcc musl-dev libsecp256k1 && \
+    apk --no-cache add --virtual build-dependencies gcc musl-dev libsecp256k1 libsecp256k1-dev libressl-dev  && \
     wget https://download.electrum.org/${ELECTRUM_VERSION}/Electrum-${ELECTRUM_VERSION}.tar.gz && \
     [ "${ELECTRUM_CHECKSUM_SHA512}  Electrum-${ELECTRUM_VERSION}.tar.gz" = "$(sha512sum Electrum-${ELECTRUM_VERSION}.tar.gz)" ] && \
     echo -e "**************************\n SHA 512 Checksum OK\n**************************" && \
-    pip3 install pycryptodomex Electrum-${ELECTRUM_VERSION}.tar.gz && \
+    pip3 install cryptography==2.1.4 pycryptodomex Electrum-${ELECTRUM_VERSION}.tar.gz && \
     rm -f Electrum-${ELECTRUM_VERSION}.tar.gz && \
     apk del build-dependencies
 
diff --git a/Makefile b/Makefile
index 4c138a1..d500e30 100644
--- a/Makefile
+++ b/Makefile
@@ -13,6 +13,9 @@ release: docker_tag docker_push output
 
 default: docker_build output
 
+download:
+	@
+
 docker_build:
 	@docker build \
 		--build-arg BUILD_DATE=`date -u +"%Y-%m-%dT%H:%M:%SZ"` \
diff --git a/docker-compose.yml b/docker-compose.yml
index 0e0b518..ae33a70 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -6,9 +6,10 @@ services:
     ports:
       - 127.0.0.1:7000:7000
     environment:
-      ELECTRUM_USER: electrum
-      ELECTRUM_PASSWORD: changeme
-      TESTNET: False
+      - ELECTRUM_USER=electrum
+      - ELECTRUM_PASSWORD=changeme
+      - ELECTRUM_NETWORK=testnet
+      - ELECTRUM_VERSION=4.2.1
     container_name: electrum
     image:  osminogin/docker-electrum-daemon
     volumes:
diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index ae94804..c7f7c22 100755
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -2,7 +2,9 @@
 set -ex
 
 # Network switch
-if [ "$TESTNET" = true ] || [ "$ELECTRUM_NETWORK" = "testnet" ]; then
+if [ "$ELECTRUM_NETWORK" = "mainnet" ]; then
+  FLAGS='--mainnet'
+elif [ "$ELECTRUM_NETWORK" = "testnet" ]; then
   FLAGS='--testnet'
 elif [ "$ELECTRUM_NETWORK" = "regtest" ]; then
   FLAGS='--regtest'