diff --git a/.github/workflows/build-main.yml b/.github/workflows/build-main.yml
index 02bb037..f632fe7 100644
--- a/.github/workflows/build-main.yml
+++ b/.github/workflows/build-main.yml
@@ -19,26 +19,31 @@ jobs:
             folder: build/latest
             file: Dockerfile.mono
             platforms: linux/amd64,linux/arm64
+            sha1: 584966ef6029f21dc842a7f55f6f117b3a0b0321
           - tag: "0.9.2.1"
             version: "0.9.2.1"
             folder: build/latest
             file: Dockerfile.mono
             platforms: linux/amd64,linux/arm64
+            sha1: c5d2e690a7739fa9c0651845b31d912f88d6fa22
           - tag: "0.9.2.2"
             version: "0.9.2.2"
             folder: build/latest
             file: Dockerfile.mono
             platforms: linux/amd64,linux/arm64
+            sha1: b280d109cf04755a02db1c729af5a5e4160d1ce6
           - tag: "0.9.3.0"
             version: "0.9.3.0"
             folder: build/latest
             file: Dockerfile
             platforms: linux/amd64,linux/arm64
+            sha1: a4bcd861626195af80cc1f962d3a2f4528859ad2
           - tag: "latest"
             version: "0.9.3.0"
             folder: build/latest
             file: Dockerfile
             platforms: linux/amd64,linux/arm64
+            sha1: a4bcd861626195af80cc1f962d3a2f4528859ad2
 
     steps:
       - name: Checkout Codebase
@@ -76,5 +81,6 @@ jobs:
           file: "${{ matrix.file }}"
           build-args: |
             OPENSIM_VERSION=${{ matrix.version }}
+            OPENSIM_SHA1=${{ matrix.sha1 }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
diff --git a/build/latest/Dockerfile b/build/latest/Dockerfile
index 56d4838..02a6aaf 100644
--- a/build/latest/Dockerfile
+++ b/build/latest/Dockerfile
@@ -6,13 +6,16 @@ LABEL org.opencontainers.image.source="https://github.com/soup-bowl/opensimulato
 LABEL org.opencontainers.image.licenses="MIT"
 
 ARG OPENSIM_VERSION=0.9.3.0
+ARG OPENSIM_SHA1="a4bcd861626195af80cc1f962d3a2f4528859ad2"
 
 RUN apt-get update \
     && apt-get install -y apt-utils curl libc6-dev libgdiplus libsqlite3-dev screen uuid-runtime \
     && apt-get clean
 
 RUN mkdir /opt/opensim-tmp \
-    && curl "http://opensimulator.org/dist/opensim-${OPENSIM_VERSION}.tar.gz" | tar xzf - -C /opt/opensim-tmp \
+    && curl -o /opt/opensim-tmp/opensim.tar.gz "http://opensimulator.org/dist/opensim-${OPENSIM_VERSION}.tar.gz" \
+    && echo "${OPENSIM_SHA1}  /opt/opensim-tmp/opensim.tar.gz" | sha1sum -c - \
+    && tar xzf /opt/opensim-tmp/opensim.tar.gz -C /opt/opensim-tmp \
     && rm /opt/opensim-tmp/opensim*/bin/OpenSim.ini \
     && rm /opt/opensim-tmp/opensim*/bin/config-include/StandaloneCommon.ini \
     && rm /opt/opensim-tmp/opensim*/bin/config-include/storage/SQLiteStandalone.ini \
diff --git a/build/latest/Dockerfile.mono b/build/latest/Dockerfile.mono
index e0e1b45..471b29a 100644
--- a/build/latest/Dockerfile.mono
+++ b/build/latest/Dockerfile.mono
@@ -6,13 +6,16 @@ LABEL org.opencontainers.image.source="https://github.com/soup-bowl/opensimulato
 LABEL org.opencontainers.image.licenses="MIT"
 
 ARG OPENSIM_VERSION=0.9.2.2
+ARG OPENSIM_SHA1="b280d109cf04755a02db1c729af5a5e4160d1ce6"
 
 RUN apt-get update \
     && apt-get install -y curl screen uuid-runtime \
     && apt-get clean
 
 RUN mkdir /opt/opensim-tmp \
-    && curl "http://opensimulator.org/dist/opensim-${OPENSIM_VERSION}.tar.gz" | tar xzf - -C /opt/opensim-tmp \
+    && curl -o /opt/opensim-tmp/opensim.tar.gz "http://opensimulator.org/dist/opensim-${OPENSIM_VERSION}.tar.gz" \
+    && echo "${OPENSIM_SHA1}  /opt/opensim-tmp/opensim.tar.gz" | sha1sum -c - \
+    && tar xzf /opt/opensim-tmp/opensim.tar.gz -C /opt/opensim-tmp \
     && rm /opt/opensim-tmp/opensim*/bin/OpenSim.ini \
     && rm /opt/opensim-tmp/opensim*/bin/config-include/StandaloneCommon.ini \
     && rm /opt/opensim-tmp/opensim*/bin/config-include/storage/SQLiteStandalone.ini \