diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 9a44b0e..35b9f04 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -31,9 +31,13 @@ jobs:
 
       - name: Install deps
         run: sudo apt-get update && sudo apt-get -y install protobuf-compiler podman
+      
+      # Improves reproducibility
+      - name: Set SOURCE_DATE_EPOCH
+        run: echo "SOURCE_DATE_EPOCH=$(git log -1 --format=%ct)" >> "$GITHUB_ENV"
 
       - name: Build
-        run: repro-env build --env CFLAGS="-fno-link-libatomic" -- cargo build --features sev-snp,smtp --release --target x86_64-unknown-linux-musl
+        run: repro-env build --env CFLAGS="-fno-link-libatomic" --env SOURCE_DATE_EPOCH -- cargo build --features sev-snp,smtp --release --target x86_64-unknown-linux-musl
 
       - name: Generate SHA checksum
         run: shasum target/x86_64-unknown-linux-musl/release/ic-gateway > ic-gateway.shasum
@@ -42,7 +46,7 @@ jobs:
         run: rm -rf target
 
       - name: Build again
-        run: repro-env build --env CFLAGS="-fno-link-libatomic" -- cargo build --features sev-snp,smtp --release --target x86_64-unknown-linux-musl
+        run: repro-env build --env CFLAGS="-fno-link-libatomic" --env SOURCE_DATE_EPOCH -- cargo build --features sev-snp,smtp --release --target x86_64-unknown-linux-musl
 
       - name: Check SHA checksum
         run: shasum -c ic-gateway.shasum