diff --git a/devops/aws/cloudformation/single-instance.yml b/devops/aws/cloudformation/single-instance.yml
index 228cd16720..c9ab159775 100644
--- a/devops/aws/cloudformation/single-instance.yml
+++ b/devops/aws/cloudformation/single-instance.yml
@@ -44,6 +44,14 @@ Resources:
           FromPort: 30333
           ToPort: 30333
           CidrIp: 0.0.0.0/0
+        - IpProtocol: tcp
+          FromPort: 8081
+          ToPort: 8081
+          CidrIp: 0.0.0.0/0
+        - IpProtocol: tcp
+          FromPort: 4000
+          ToPort: 4000
+          CidrIp: 0.0.0.0/0
       Tags:
         - Key: Name
           Value: !Sub '${AWS::StackName}_substrate_node'
diff --git a/scripts/compute-runtime-blob-hash.sh b/scripts/compute-runtime-blob-hash.sh
index be47c1bfd1..8e3bf69fb4 100755
--- a/scripts/compute-runtime-blob-hash.sh
+++ b/scripts/compute-runtime-blob-hash.sh
@@ -6,7 +6,7 @@ set -e
 # for deterministic builds.
 # Assumes b2sum is already instally on the host machine.
 
-SCRIPT_PATH=`$(dirname "${BASH_SOURCE[0]}")`
+SCRIPT_PATH=`dirname "${BASH_SOURCE[0]}"`
 cd $SCRIPT_PATH
 
 CODE_SHASUM=`./runtime-code-shasum.sh`