diff --git a/README.md b/README.md
index 89f4776..59a474c 100644
--- a/README.md
+++ b/README.md
@@ -12,19 +12,19 @@ Adapted from https://github.com/madcoda/dotenv-shell
 
 ## Outputs
 
-[set-env](https://help.github.com/en/actions/reference/workflow-commands-for-github-actions#setting-an-environment-variable) workflow commands to stdout. 
+[`echo "{name}={value}"`](https://help.github.com/en/actions/reference/workflow-commands-for-github-actions#setting-an-environment-variable) workflow commands to `$GITHUB_ENV`.
 
-```
-::set-env name=TEST_DEFAULT_ENVFILE::expected
-::set-env name=TEST_DOTENV_OVERRIDES_DEFAULT::unexpected
-::set-env name=TEST_UNQUOTED::unexpected
-::set-env name=TEST_UNQUOTED::a=1 b=2 c=3
-::set-env name=TEST_SINGLE_QUOTED::1 2 3 4
-::set-env name=TEST_DOUBLE_QUOTED::1 2 3 4
-::set-env name=TEST_INTERPOLATION::a=1 b=2 c=3 d=4
-::set-env name=TEST_EXISTING::new-value
-::set-env name=TEST_DOTENV_OVERRIDES_DEFAULT::expected
-::set-env name=TEST_NO_NEWLINE::still there
+```shell
+echo "TEST_DEFAULT_ENVFILE=expected" >> $GITHUB_ENV
+echo "TEST_DOTENV_OVERRIDES_DEFAULT=unexpected" >> $GITHUB_ENV
+echo "TEST_UNQUOTED=unexpected" >> $GITHUB_ENV
+echo "TEST_UNQUOTED=a=1 b=2 c=3" >> $GITHUB_ENV
+echo "TEST_SINGLE_QUOTED=1 2 3 4" >> $GITHUB_ENV
+echo "TEST_DOUBLE_QUOTED=1 2 3 4" >> $GITHUB_ENV
+echo "TEST_INTERPOLATION=a=1 b=2 c=3 d=4" >> $GITHUB_ENV
+echo "TEST_EXISTING=new-value" >> $GITHUB_ENV
+echo "TEST_DOTENV_OVERRIDES_DEFAULT=expected" >> $GITHUB_ENV
+echo "TEST_NO_NEWLINE=still there" >> $GITHUB_ENV
 ```
 
 ## Example Usage
@@ -39,16 +39,18 @@ with:
 
 ```
 $ bash tests/dotenv-test.sh
-::set-env name=TEST_DEFAULT_ENVFILE::expected
-::set-env name=TEST_DOTENV_OVERRIDES_DEFAULT::unexpected
-::set-env name=TEST_UNQUOTED::unexpected
-::set-env name=TEST_UNQUOTED::a=1 b=2 c=3
-::set-env name=TEST_SINGLE_QUOTED::1 2 3 4
-::set-env name=TEST_DOUBLE_QUOTED::1 2 3 4
-::set-env name=TEST_INTERPOLATION::a=1 b=2 c=3 d=4
-::set-env name=TEST_EXISTING::new-value
-::set-env name=TEST_DOTENV_OVERRIDES_DEFAULT::expected
-::set-env name=TEST_NO_NEWLINE::still there
+Contents of $GITHUB_ENV file:
+TEST_DEFAULT_ENVFILE=expected
+TEST_DOTENV_OVERRIDES_DEFAULT=unexpected
+TEST_UNQUOTED=unexpected
+TEST_UNQUOTED=a=1 b=2 c=3
+TEST_SINGLE_QUOTED=1 2 3 4
+TEST_DOUBLE_QUOTED=1 2 3 4
+TEST_INTERPOLATION=a=1 b=2 c=3 d=4
+TEST_EXISTING=new-value
+TEST_DOTENV_OVERRIDES_DEFAULT=expected
+TEST_NO_NEWLINE=still there
+
 Testing blank line parsing: ok
 Testing unquoted: ok
 Testing single quoted: ok
@@ -58,5 +60,6 @@ Testing overwrite of existing variables: ok
 Testing parsing of last line: ok
 Test loading variables from default.env file: ok
 Test .env variables override variables from default.env file: ok
+Test error message from missing .env file: ok
 $
 ```
diff --git a/dotenv.sh b/dotenv.sh
index ad176fe..b88c8dc 100755
--- a/dotenv.sh
+++ b/dotenv.sh
@@ -56,9 +56,9 @@ export_envs() {
 			continue
 		fi
 
-        value=$(eval echo "$temp")
-        eval export "$key='$value'";
-		echo "::set-env name=$key::$value"
+		value=$(eval echo "$temp")
+		eval export "$key='$value'";
+			echo "$key=$value" >> $GITHUB_ENV
 	done < $1
 }
 
diff --git a/tests/dotenv-test.sh b/tests/dotenv-test.sh
index daff58a..a458a08 100755
--- a/tests/dotenv-test.sh
+++ b/tests/dotenv-test.sh
@@ -3,11 +3,16 @@
 main() {
     cd "$( dirname "${BASH_SOURCE[0]}" )" || exit 1
 
+    export GITHUB_ENV=$(mktemp)
     # shellcheck disable=SC1091
     export TEST_EXISTING="expected"
     export DOTENV_DEFAULT="default.env"
     source ../dotenv.sh
 
+    echo "Contents of \$GITHUB_ENV file:"
+    cat "$GITHUB_ENV"
+    echo
+
     echo "Testing blank line parsing: ok" # i.e. didn't crash
     assert_equal "$TEST_UNQUOTED" 'a=1 b=2 c=3' 'Testing unquoted'
     assert_equal "$TEST_SINGLE_QUOTED" '1 2 3 4' 'Testing single quoted'
@@ -18,8 +23,10 @@ main() {
     assert_equal "$TEST_DEFAULT_ENVFILE" 'expected' 'Test loading variables from default.env file'
     assert_equal "$TEST_DOTENV_OVERRIDES_DEFAULT" 'expected' 'Test .env variables override variables from default.env file'
 
-    TEST_NO_ENVFILE=`DOTENV_FILE=nonexistent.env ../dotenv.sh 2>&1 >&3 3>&-` # Close stdout for this test
+    TEST_NO_ENVFILE=`DOTENV_FILE=nonexistent.env ../dotenv.sh 2>&1` # Close stdout for this test
     assert_equal "$TEST_NO_ENVFILE" "nonexistent.env file not found" 'Test error message from missing .env file'
+
+    rm "$GITHUB_ENV"
 }
 
 assert_equal() {