diff --git a/backend/address2UPRN/handler/Dockerfile b/backend/address2UPRN/handler/Dockerfile
index 3f7567d3..5ccb5590 100644
--- a/backend/address2UPRN/handler/Dockerfile
+++ b/backend/address2UPRN/handler/Dockerfile
@@ -1,4 +1,5 @@
-FROM public.ecr.aws/lambda/python:3.10
+# FROM public.ecr.aws/lambda/python:3.10
+# FROM python:3.11.10-bullseye
 
 # This is not going to be permenant - but until we solve for env variables in live prod
 ENV EPC_AUTH_TOKEN=a2Nvbm5rb3dsZXNzYXJAZ21haWwuY29tOjY5MGJiMWM0NmIyOGI5ZDUxYzAxMzQzYzNiZGNlZGJjZDNmODQwMzAg
@@ -11,6 +12,7 @@ WORKDIR /var/task
 # -----------------------------
 COPY backend/address2UPRN/handler/requirements.txt .
 
+
 # Install dependencies into Lambda runtime
 RUN pip install --no-cache-dir -r requirements.txt
 
diff --git a/backend/address2UPRN/handler/requirements.txt b/backend/address2UPRN/handler/requirements.txt
index bc753841..eba2c846 100644
--- a/backend/address2UPRN/handler/requirements.txt
+++ b/backend/address2UPRN/handler/requirements.txt
@@ -1,3 +1,6 @@
-epc-api-python==1.0.2
+pandas==2.2.2
+numpy<2.0
+requests
 tqdm
-pandas
\ No newline at end of file
+openpyxl
+epc-api-python==1.0.2
diff --git a/backend/postcode_splitter/handler/Dockerfile b/backend/postcode_splitter/handler/Dockerfile
index 3f77f38f..f8196297 100644
--- a/backend/postcode_splitter/handler/Dockerfile
+++ b/backend/postcode_splitter/handler/Dockerfile
@@ -1,4 +1,4 @@
-FROM public.ecr.aws/lambda/python:3.10
+FROM public.ecr.aws/lambda/python:3.11
 
 # Set working directory (Lambda task root)
 WORKDIR /var/task
@@ -9,7 +9,7 @@ RUN pip install --no-cache-dir -r requirements.txt
 
 COPY utils/ utils/
 COPY backend/postcode_splitter/main.py .
-# -----------------------------
-# Lambda handler
-# -----------------------------
+# # -----------------------------
+# # Lambda handler
+# # -----------------------------
 CMD ["main.handler"]
diff --git a/backend/postcode_splitter/handler/requirements.txt b/backend/postcode_splitter/handler/requirements.txt
index f6618d2b..8adea4e7 100644
--- a/backend/postcode_splitter/handler/requirements.txt
+++ b/backend/postcode_splitter/handler/requirements.txt
@@ -1,5 +1,6 @@
-pandas>=1.3.0
-requests>=2.28.0
-tqdm>=4.64.0
-epc-api>=0.1.0
-openpyxl>=3.8.0
+pandas==2.2.2
+numpy<2.0
+requests
+tqdm
+openpyxl
+epc-api-python==1.0.2
\ No newline at end of file