diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 434b5f0..9e26d93 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -14,7 +14,7 @@ jobs:
 
       - uses: asdf-vm/actions/install@v3
 
-      - run: scripts/lint.bash
+      - run: scripts/lint.sh
 
   actionlint:
     runs-on: ubuntu-latest
diff --git a/bin/download b/bin/download
index 7e13904..d707bb6 100755
--- a/bin/download
+++ b/bin/download
@@ -5,8 +5,8 @@ set -euo pipefail
 current_script_path=${BASH_SOURCE[0]}
 plugin_dir=$(dirname "$(dirname "${current_script_path}")")
 
-# shellcheck source=./lib/utils.bash
-source "${plugin_dir}/lib/utils.bash"
+# shellcheck source=./lib/utils.sh
+source "${plugin_dir}/lib/utils.sh"
 
 mkdir -p "${ASDF_DOWNLOAD_PATH}"
 
diff --git a/bin/help.links b/bin/help.links
index d03766f..aafa0df 100755
--- a/bin/help.links
+++ b/bin/help.links
@@ -5,8 +5,8 @@ set -euo pipefail
 current_script_path=${BASH_SOURCE[0]}
 plugin_dir=$(dirname "$(dirname "${current_script_path}")")
 
-# shellcheck source=./lib/utils.bash
-source "${plugin_dir}/lib/utils.bash"
+# shellcheck source=./lib/utils.sh
+source "${plugin_dir}/lib/utils.sh"
 
 cat <<EOF
 - official: https://github.com/tofuutils/tenv
diff --git a/bin/help.overview b/bin/help.overview
index 57d3c02..a29eafe 100755
--- a/bin/help.overview
+++ b/bin/help.overview
@@ -5,8 +5,8 @@ set -euo pipefail
 current_script_path=${BASH_SOURCE[0]}
 plugin_dir=$(dirname "$(dirname "${current_script_path}")")
 
-# shellcheck source=./lib/utils.bash
-source "${plugin_dir}/lib/utils.bash"
+# shellcheck source=./lib/utils.sh
+source "${plugin_dir}/lib/utils.sh"
 
 cat <<EOF
 tenv: a versatile version manager for OpenTofu, Terraform and Terragrunt, written in Go
diff --git a/bin/install b/bin/install
index 3e88945..d05d384 100755
--- a/bin/install
+++ b/bin/install
@@ -5,7 +5,7 @@ set -euo pipefail
 current_script_path=${BASH_SOURCE[0]}
 plugin_dir=$(dirname "$(dirname "${current_script_path}")")
 
-# shellcheck source=./lib/utils.bash
-source "${plugin_dir}/lib/utils.bash"
+# shellcheck source=./lib/utils.sh
+source "${plugin_dir}/lib/utils.sh"
 
 install_version "${ASDF_INSTALL_TYPE}" "${ASDF_INSTALL_VERSION}" "${ASDF_INSTALL_PATH}"
diff --git a/bin/latest-stable b/bin/latest-stable
index d16f86c..5da2cd0 100755
--- a/bin/latest-stable
+++ b/bin/latest-stable
@@ -5,8 +5,8 @@ set -euo pipefail
 current_script_path=${BASH_SOURCE[0]}
 plugin_dir=$(dirname "$(dirname "${current_script_path}")")
 
-# shellcheck source=./lib/utils.bash
-. "${plugin_dir}/lib/utils.bash"
+# shellcheck source=./lib/utils.sh
+. "${plugin_dir}/lib/utils.sh"
 
 curl_opts=(-sI)
 
diff --git a/bin/list-all b/bin/list-all
index 52afdd2..fbb1f4e 100755
--- a/bin/list-all
+++ b/bin/list-all
@@ -5,7 +5,7 @@ set -euo pipefail
 current_script_path=${BASH_SOURCE[0]}
 plugin_dir=$(dirname "$(dirname "${current_script_path}")")
 
-# shellcheck source=./lib/utils.bash
-source "${plugin_dir}/lib/utils.bash"
+# shellcheck source=./lib/utils.sh
+source "${plugin_dir}/lib/utils.sh"
 
 list_all_versions | sort_versions | xargs echo
diff --git a/lib/utils.bash b/lib/utils.sh
similarity index 65%
rename from lib/utils.bash
rename to lib/utils.sh
index b8a7096..3b736ed 100644
--- a/lib/utils.bash
+++ b/lib/utils.sh
@@ -39,9 +39,9 @@ list_all_versions() {
 get_platform() {
 	local -r kernel="$(uname -s)"
 	if [[ ${OSTYPE} == "msys" || ${kernel} == "CYGWIN"* || ${kernel} == "MINGW"* ]]; then
-		echo windows
+		echo Windows
 	else
-		uname | tr '[:upper:]' '[:lower:]'
+		uname
 	fi
 }
 
@@ -70,10 +70,10 @@ download_release() {
 	local -r platform="$(get_platform)"
 	local -r arch="$(get_arch)"
 
-	url="$GH_REPO/releases/download/v${version}/${TOOL_BIN_NAME}_${version}_${platform}_${arch}.tar.gz"
+	url="$GH_REPO/releases/download/v${version}/${TOOL_BIN_NAME}_v${version}_${platform}_${arch}.tar.gz"
 
-	echo "* Downloading $TOOL_NAME release v$version..."
-	curl "${curl_opts[@]}" -o "$filename" -C - "${url}" || fail "Could not download ${url}"
+	echo "* Downloading ${TOOL_NAME} release v${version}..."
+	curl "${curl_opts[@]}" -o "${filename}" -C - "${url}" || fail "Could not download ${url}"
 
 	#  Extract contents of zip file into the download directory
 	tar -xzf "${filename}" -C "${ASDF_DOWNLOAD_PATH}" || fail "Could not extract ${filename}"
@@ -108,34 +108,15 @@ install_version() {
 		rm "$(get_release_file)"
 	) || (
 		rm -rf "$install_path"
-		fail "An error occurred while installing $TOOL_NAME $version."
+		fail "An error occurred while installing ${TOOL_NAME} ${version}."
 	)
 }
 
 verify() {
-	local -r version="$1"
-	local -r download_path="$2"
-	local -r checksum_file="${TOOL_BIN_NAME}_${version}_SHA256SUMS"
-	local -r signature_file="${checksum_file}.sig"
-	local -r cert_file="${checksum_file}.pem"
-	local -r cert_identity="https://github\.com/tofuutils/tenv/\.github/workflows/release\.yml@refs/(heads|tags)/(main|v1\..+)"
-	local -r cert_oidc_issuer="https://token.actions.githubusercontent.com"
-
-	baseURL="$GH_REPO/releases/download/v${version}"
-	local files=("$checksum_file" "$signature_file" "$cert_file")
-	echo "* Downloading signature files ..."
-	for file in "${files[@]}"; do
-		curl "${curl_opts[@]}" -o "${download_path}/${file}" "${baseURL}/${file}" || fail "Could not download ${baseURL}/${file}"
-	done
-
-	if ! (
-		cosign verify-blob --signature "${download_path}/${signature_file}" \
-			--certificate "${download_path}/${cert_file}" \
-			--certificate-identity-regexp="${cert_identity}" \
-			--certificate-oidc-issuer="${cert_oidc_issuer}" \
-			"${download_path}/${checksum_file}"
-	); then
-		echo "signature verification failed" >&2
-		return 1
-	fi
+	local -r version="${1}"
+	local -r download_path="${2}"
+	local -r checksum_file="${TOOL_BIN_NAME}_${version}_checksums.txt"
+
+	baseURL="${GH_REPO}/releases/download/v${version}"
+	local files=("$checksum_file")
 }
diff --git a/scripts/format.bash b/scripts/format.sh
similarity index 100%
rename from scripts/format.bash
rename to scripts/format.sh
diff --git a/scripts/lint.bash b/scripts/lint.sh
similarity index 100%
rename from scripts/lint.bash
rename to scripts/lint.sh