diff --git a/bin/update-deps.sh b/bin/update-deps.sh
index d7735e4..7b346a3 100755
--- a/bin/update-deps.sh
+++ b/bin/update-deps.sh
@@ -16,8 +16,8 @@ PROJECT_ROOT="$(cd -- "${CURRENT_DIR}/.." && pwd)"
 source "${PROJECT_ROOT}/bin/utility.sh"
 
 DEPENDENCY_CLOUDFRONT_URL="https://deps.runfinch.com"
-AARCH64_FILENAME_PATTERN="lima-and-qemu.macos-aarch64.[0-9].*\.gz$"
-AMD64_FILENAME_PATTERN="lima-and-qemu.macos-x86_64.[0-9].*\.gz$"
+AARCH64_FILENAME_PATTERN="lima-and-qemu.macos-aarch64\.[0-9]+\.tar\.gz$"
+AMD64_FILENAME_PATTERN="lima-and-qemu.macos-x86_64\.[0-9]+\.tar\.gz$"
 AARCH64="aarch64"
 X86_64="x86-64"
 
diff --git a/bin/update-rootfs.sh b/bin/update-rootfs.sh
index 51b1619..389441f 100755
--- a/bin/update-rootfs.sh
+++ b/bin/update-rootfs.sh
@@ -16,7 +16,7 @@ PROJECT_ROOT="$(cd -- "${CURRENT_DIR}/.." && pwd)"
 source "${PROJECT_ROOT}/bin/utility.sh"
 
 DEPENDENCY_CLOUDFRONT_URL="https://deps.runfinch.com"
-AMD64_FILENAME_PATTERN="finch-rootfs-production-amd64-[0-9]+\.tar.gz"
+AMD64_FILENAME_PATTERN="finch-rootfs-production-amd64-[0-9]+\.tar\.gz$"
 PLATFORM="common"
 # ARM not currently supported for Finch on Windows
 # AARCH64="aarch64"
diff --git a/bin/utility.sh b/bin/utility.sh
index 88a7b22..de2b0b4 100644
--- a/bin/utility.sh
+++ b/bin/utility.sh
@@ -14,7 +14,7 @@ find_latest_object_match_from_s3() {
     local object_pattern="$1"
     local s3_bucket="$2"
 
-    object=$(aws s3 ls "s3://${s3_bucket}" --recursive | grep "${object_pattern}" | sort | tail -n 1 | awk '{print $4}')
+    object=$(aws s3 ls "s3://${s3_bucket}" --recursive | grep -E "${object_pattern}" | sort | tail -n 1 | awk '{print $4}')
     if [[ -z "$object" ]]; then
         echo "error: no match found for pattern ${object_pattern}"
         exit 1