diff --git a/acme_common/Cargo.toml b/acme_common/Cargo.toml
index 78661b3..a18d111 100644
--- a/acme_common/Cargo.toml
+++ b/acme_common/Cargo.toml
@@ -24,7 +24,6 @@ base64 = "0.13"
 daemonize = "0.4"
 env_logger = "0.8"
 glob = "0.3"
-handlebars = "3.0"
 libc = "0.2"
 log = "0.4"
 native-tls = "0.2"
@@ -33,6 +32,7 @@ openssl-sys = { version = "0.9", optional = true }
 punycode = "0.4"
 serde_json = "1.0"
 syslog = "5.0"
+tinytemplate = "1.2"
 toml = "0.5"
 
 [target.'cfg(unix)'.dependencies]
diff --git a/acme_common/src/error.rs b/acme_common/src/error.rs
index 4e3dbab..fe3f8f3 100644
--- a/acme_common/src/error.rs
+++ b/acme_common/src/error.rs
@@ -105,8 +105,8 @@ impl From<glob::PatternError> for Error {
     }
 }
 
-impl From<handlebars::TemplateRenderError> for Error {
-    fn from(error: handlebars::TemplateRenderError) -> Self {
+impl From<tinytemplate::error::Error> for Error {
+    fn from(error: tinytemplate::error::Error) -> Self {
         format!("template error: {}", error).into()
     }
 }
diff --git a/acmed/Cargo.toml b/acmed/Cargo.toml
index 7cca534..6ca8314 100644
--- a/acmed/Cargo.toml
+++ b/acmed/Cargo.toml
@@ -25,11 +25,11 @@ attohttpc = { version = "0.17", default-features = false, features = ["charsets"
 bincode = "1.3"
 clap = "2.32"
 glob = "0.3"
-handlebars = "3.0"
 log = "0.4"
 nom = { version = "6.0", default-features = false, features = [] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
+tinytemplate = "1.2"
 toml = "0.5"
 
 [target.'cfg(unix)'.dependencies]
diff --git a/acmed/build.rs b/acmed/build.rs
index 72db5d4..a43cc1c 100644
--- a/acmed/build.rs
+++ b/acmed/build.rs
@@ -117,7 +117,7 @@ fn set_default_values() {
     set_data_path_if_absent!("ACMED_DEFAULT_CERT_DIR", "certs");
     set_env_var_if_absent!(
         "ACMED_DEFAULT_CERT_FORMAT",
-        "{{name}}_{{key_type}}.{{file_type}}.{{ext}}"
+        "{ name }_{ key_type }.{ file_type }.{ ext }"
     );
     set_cfg_path_if_absent!("ACMED_DEFAULT_CONFIG_FILE", "acmed.toml");
     set_runstate_path_if_absent!("ACMED_DEFAULT_PID_FILE", "acmed.pid");
diff --git a/acmed/config/default_hooks.toml b/acmed/config/default_hooks.toml
index 804e50d..37e4ffb 100644
--- a/acmed/config/default_hooks.toml
+++ b/acmed/config/default_hooks.toml
@@ -12,7 +12,7 @@
 
 
 #
-# http-01 challenge in "/var/www/{{identifier}}/"
+# http-01 challenge in "/var/www/{ identifier }/"
 #
 
 [[hook]]
@@ -21,7 +21,7 @@ type = ["challenge-http-01"]
 cmd = "mkdir"
 args = [
     "-m", "0755",
-    "-p", "{{#if env.HTTP_ROOT}}{{env.HTTP_ROOT}}{{else}}/var/www{{/if}}/{{identifier}}/.well-known/acme-challenge"
+    "-p", "{{ if env.HTTP_ROOT }}{ env.HTTP_ROOT }{{ else }}/var/www{{ endif }}/{ identifier }/.well-known/acme-challenge"
 ]
 allow_failure = true
 
@@ -29,8 +29,8 @@ allow_failure = true
 name = "http-01-echo-echo"
 type = ["challenge-http-01"]
 cmd = "echo"
-args = ["{{proof}}"]
-stdout = "{{#if env.HTTP_ROOT}}{{env.HTTP_ROOT}}{{else}}/var/www{{/if}}/{{identifier}}/.well-known/acme-challenge/{{file_name}}"
+args = ["{ proof }"]
+stdout = "{{ if env.HTTP_ROOT }}{ env.HTTP_ROOT }{{ else }}/var/www{{ endif }}/{ identifier }/.well-known/acme-challenge/{ file_name }"
 
 [[hook]]
 name = "http-01-echo-chmod"
@@ -38,7 +38,7 @@ type = ["challenge-http-01"]
 cmd = "chmod"
 args = [
     "a+r",
-    "{{#if env.HTTP_ROOT}}{{env.HTTP_ROOT}}{{else}}/var/www{{/if}}/{{identifier}}/.well-known/acme-challenge/{{file_name}}"
+    "{{ if env.HTTP_ROOT }}{ env.HTTP_ROOT }{{ else }}/var/www{{ endif }}/{ identifier }/.well-known/acme-challenge/{ file_name }"
 ]
 allow_failure = true
 
@@ -48,7 +48,7 @@ type = ["challenge-http-01-clean"]
 cmd = "rm"
 args = [
     "-f",
-    "{{#if env.HTTP_ROOT}}{{env.HTTP_ROOT}}{{else}}/var/www{{/if}}/{{identifier}}/.well-known/acme-challenge/{{file_name}}"
+    "{{ if env.HTTP_ROOT }}{ env.HTTP_ROOT }{{ else }}/var/www{{ endif }}/{ identifier }/.well-known/acme-challenge/{ file_name }"
 ]
 allow_failure = true
 
@@ -71,10 +71,10 @@ name = "tls-alpn-01-tacd-start-tcp"
 type = ["challenge-tls-alpn-01"]
 cmd = "tacd"
 args = [
-    "--pid-file", "{{#if env.TACD_PID_ROOT}}{{env.TACD_PID_ROOT}}{{else}}/run{{/if}}/tacd_{{identifier}}.pid",
-    "--domain", "{{identifier_tls_alpn}}",
-    "--acme-ext", "{{proof}}",
-    "--listen", "{{#if env.TACD_HOST}}{{env.TACD_HOST}}{{else}}{{identifier}}{{/if}}:{{#if env.TACD_PORT}}{{env.TACD_PORT}}{{else}}5001{{/if}}"
+    "--pid-file", "{{ if env.TACD_PID_ROOT }}{ env.TACD_PID_ROOT }{{ else }}/run{{ endif }}/tacd_{ identifier }.pid",
+    "--domain", "{ identifier_tls_alpn }",
+    "--acme-ext", "{ proof }",
+    "--listen", "{{ if env.TACD_HOST }}{ env.TACD_HOST }{{ else }}{ identifier }{{ endif }}:{{ if env.TACD_PORT }}{ env.TACD_PORT }{{ else }}5001{{ endif }}"
 ]
 
 [[hook]]
@@ -82,10 +82,10 @@ name = "tls-alpn-01-tacd-start-unix"
 type = ["challenge-tls-alpn-01"]
 cmd = "tacd"
 args = [
-    "--pid-file", "{{#if env.TACD_PID_ROOT}}{{env.TACD_PID_ROOT}}{{else}}/run{{/if}}/tacd_{{identifier}}.pid",
-    "--domain", "{{identifier_tls_alpn}}",
-    "--acme-ext", "{{proof}}",
-    "--listen", "unix:{{#if env.TACD_SOCK_ROOT}}{{env.TACD_SOCK_ROOT}}{{else}}/run{{/if}}/tacd_{{identifier}}.sock"
+    "--pid-file", "{{ if env.TACD_PID_ROOT }}{ env.TACD_PID_ROOT }{{ else }}/run{{ endif }}/tacd_{ identifier }.pid",
+    "--domain", "{ identifier_tls_alpn }",
+    "--acme-ext", "{ proof }",
+    "--listen", "unix:{{ if env.TACD_SOCK_ROOT }}{ env.TACD_SOCK_ROOT }{{ else }}/run{{ endif }}/tacd_{ identifier }.sock"
 ]
 
 [[hook]]
@@ -93,7 +93,7 @@ name = "tls-alpn-01-tacd-kill"
 type = ["challenge-tls-alpn-01-clean"]
 cmd = "pkill"
 args = [
-    "-F", "{{#if env.TACD_PID_ROOT}}{{env.TACD_PID_ROOT}}{{else}}/run{{/if}}/tacd_{{identifier}}.pid",
+    "-F", "{{ if env.TACD_PID_ROOT }}{ env.TACD_PID_ROOT }{{ else }}/run{{ endif }}/tacd_{ identifier }.pid",
 ]
 allow_failure = true
 
@@ -102,7 +102,7 @@ name = "tls-alpn-01-tacd-rm"
 type = ["challenge-tls-alpn-01-clean"]
 cmd = "rm"
 args = [
-    "-f", "{{#if env.TACD_PID_ROOT}}{{env.TACD_PID_ROOT}}{{else}}/run{{/if}}/tacd_{{identifier}}.pid",
+    "-f", "{{ if env.TACD_PID_ROOT }}{ env.TACD_PID_ROOT }{{ else }}/run{{ endif }}/tacd_{ identifier }.pid",
 ]
 allow_failure = true
 
@@ -125,7 +125,7 @@ type = ["file-pre-create", "file-pre-edit"]
 cmd = "git"
 args = [
     "init",
-    "{{file_directory}}"
+    "{ file_directory }"
 ]
 
 [[hook]]
@@ -133,8 +133,8 @@ name = "git-add"
 type = ["file-post-create", "file-post-edit"]
 cmd = "git"
 args = [
-    "-C", "{{file_directory}}",
-    "add", "{{file_name}}"
+    "-C", "{ file_directory }",
+    "add", "{ file_name }"
 ]
 allow_failure = true
 
@@ -143,12 +143,12 @@ name = "git-commit"
 type = ["file-post-create", "file-post-edit"]
 cmd = "git"
 args = [
-    "-C", "{{file_directory}}",
-    "-c", "user.name='{{#if env.GIT_USERNAME}}{{env.GIT_USERNAME}}{{else}}ACMEd{{/if}}'",
-    "-c", "user.email='{{#if env.GIT_EMAIL}}{{env.GIT_EMAIL}}{{else}}acmed@localhost{{/if}}'",
+    "-C", "{ file_directory }",
+    "-c", "user.name='{{ if env.GIT_USERNAME }}{ env.GIT_USERNAME }{{ else }}ACMEd{{ endif }}'",
+    "-c", "user.email='{{ if env.GIT_EMAIL }}{ env.GIT_EMAIL }{{ else }}acmed@localhost{{ endif }}'",
     "commit",
-    "-m", "{{file_name}}",
-    "--only", "{{file_name}}"
+    "-m", "{ file_name }",
+    "--only", "{ file_name }"
 ]
 allow_failure = true
 
diff --git a/acmed/src/hooks.rs b/acmed/src/hooks.rs
index eaca640..7f18935 100644
--- a/acmed/src/hooks.rs
+++ b/acmed/src/hooks.rs
@@ -1,7 +1,7 @@
 pub use crate::config::HookType;
 use crate::logs::HasLogger;
+use crate::template::render_template;
 use acme_common::error::Error;
-use handlebars::Handlebars;
 use serde::Serialize;
 use std::collections::hash_map::Iter;
 use std::collections::{HashMap, HashSet};
@@ -102,10 +102,10 @@ impl fmt::Display for Hook {
 }
 
 macro_rules! get_hook_output {
-    ($logger: expr, $out: expr, $reg: ident, $data: expr, $hook_name: expr, $out_name: expr) => {{
+    ($logger: expr, $out: expr, $data: expr, $hook_name: expr, $out_name: expr) => {{
         match $out {
             Some(path) => {
-                let path = $reg.render_template(path, $data)?;
+                let path = render_template(path, $data)?;
                 $logger.trace(&format!(
                     "hook \"{}\": {}: {}",
                     $hook_name, $out_name, &path
@@ -124,12 +124,11 @@ where
     T: Clone + HookEnvData + Serialize,
 {
     logger.debug(&format!("calling hook \"{}\"", hook.name));
-    let reg = Handlebars::new();
     let mut v = vec![];
     let args = match &hook.args {
         Some(lst) => {
             for fmt in lst.iter() {
-                let s = reg.render_template(fmt, &data)?;
+                let s = render_template(fmt, &data)?;
                 v.push(s);
             }
             v.as_slice()
@@ -144,7 +143,6 @@ where
         .stdout(get_hook_output!(
             logger,
             &hook.stdout,
-            reg,
             &data,
             &hook.name,
             "stdout"
@@ -152,7 +150,6 @@ where
         .stderr(get_hook_output!(
             logger,
             &hook.stderr,
-            reg,
             &data,
             &hook.name,
             "stderr"
@@ -164,7 +161,7 @@ where
         .spawn()?;
     match &hook.stdin {
         HookStdin::Str(s) => {
-            let data_in = reg.render_template(&s, &data)?;
+            let data_in = render_template(&s, &data)?;
             logger.trace(&format!(
                 "hook \"{}\": string stdin: {}",
                 hook.name, &data_in
@@ -173,7 +170,7 @@ where
             stdin.write_all(data_in.as_bytes())?;
         }
         HookStdin::File(f) => {
-            let file_name = reg.render_template(&f, &data)?;
+            let file_name = render_template(&f, &data)?;
             logger.trace(&format!(
                 "hook \"{}\": file stdin: {}",
                 hook.name, &file_name
diff --git a/acmed/src/main.rs b/acmed/src/main.rs
index a06bea3..eebe8fc 100644
--- a/acmed/src/main.rs
+++ b/acmed/src/main.rs
@@ -20,6 +20,7 @@ mod jws;
 mod logs;
 mod main_event_loop;
 mod storage;
+mod template;
 
 pub const APP_NAME: &str = "ACMEd";
 pub const APP_VERSION: &str = env!("CARGO_PKG_VERSION");
diff --git a/acmed/src/storage.rs b/acmed/src/storage.rs
index 9a7e5ba..bc7930f 100644
--- a/acmed/src/storage.rs
+++ b/acmed/src/storage.rs
@@ -1,9 +1,9 @@
 use crate::hooks::{self, FileStorageHookData, Hook, HookEnvData, HookType};
 use crate::logs::HasLogger;
+use crate::template::render_template;
 use acme_common::b64_encode;
 use acme_common::crypto::{KeyPair, X509Certificate};
 use acme_common::error::Error;
-use handlebars::Handlebars;
 use serde::Serialize;
 use std::collections::HashMap;
 use std::fmt;
@@ -110,8 +110,7 @@ fn get_file_full_path(
                 file_type: file_type.to_string(),
                 name: fm.crt_name.to_owned(),
             };
-            let reg = Handlebars::new();
-            reg.render_template(&fm.crt_name_format, &fmt_data)?
+            render_template(&fm.crt_name_format, &fmt_data)?
         }
     };
     let mut path = PathBuf::from(&base_path);
diff --git a/acmed/src/template.rs b/acmed/src/template.rs
new file mode 100644
index 0000000..412b63f
--- /dev/null
+++ b/acmed/src/template.rs
@@ -0,0 +1,12 @@
+use acme_common::error::Error;
+use serde::Serialize;
+use tinytemplate::TinyTemplate;
+
+pub fn render_template<T>(template: &str, data: &T) -> Result<String, Error>
+where
+    T: Serialize,
+{
+    let mut reg = TinyTemplate::new();
+    reg.add_template("reg", template)?;
+    Ok(reg.render("reg", data)?)
+}
diff --git a/man/en/acmed.toml.5 b/man/en/acmed.toml.5
index abb7460..72ef57a 100644
--- a/man/en/acmed.toml.5
+++ b/man/en/acmed.toml.5
@@ -118,17 +118,17 @@ Name of the endpoint to use.
 Table of environment variables that will be accessible from hooks.
 .It Ic file_name_format Ar string
 Template used to build the file's name. The template syntax is
-.Em Handlebars .
+.Em TinyTemplate .
 See the
 .Sx STANDARDS
 section for a link to the
-.Em Handlebars
+.Em TinyTemplate
 specifications. If not specified, the value defined in the
 .Em endpoint
 element, and then the
 .Em global
 element, is used. Default is
-.Dq {{name}}_{{key_type}}.{{file_type}}.{{ext}} .
+.Dq { name }_{ key_type }.{ file_type }.{ ext } .
 Possible variables are:
 .Bl -tag
 .It Ic ext Ar string
@@ -401,11 +401,11 @@ and
 are considered as template strings whereas
 .Em cmd
 is not. The template syntax is
-.Em Handlebars .
+.Em TinyTemplate .
 See the
 .Sx STANDARDS
 section for a link to the
-.Em Handlebars
+.Em TinyTemplate
 specifications.
 .Pp
 The available types and the associated template variable are described below.
@@ -577,10 +577,10 @@ and
 environment variables.
 .It Pa http-01-echo
 This hook is designed to solve the http-01 challenge. For this purpose, it will write the proof into
-.Pa {{env.HTTP_ROOT}}/{{identifier}}/.well-known/acme-challenge/{{file_name}} .
+.Pa { env.HTTP_ROOT }/{ identifier }/.well-known/acme-challenge/{ file_name } .
 .Pp
 The web server must be configured so the file
-.Pa http://{{identifier}}/.well-known/acme-challenge/{{file_name}}
+.Pa http://{ identifier }/.well-known/acme-challenge/{ file_name }
 can be accessed from the CA.
 .Pp
 If
@@ -605,7 +605,7 @@ environment variable (default is 5001).
 .Pp
 .Xr tacd 8
 will store its pid into
-.Pa {{TACD_PID_ROOT}}/tacd_{{identifier}}.pid .
+.Pa { TACD_PID_ROOT }/tacd_{ identifier }.pid .
 If
 .Ev TACD_PID_ROOT
 is not specified, it will be set to
@@ -621,7 +621,7 @@ option.
 .Pp
 .Xr tacd 8
 will listen on the unix socket
-.Pa {{env.TACD_SOCK_ROOT}}/tacd_{{identifier}}.sock .
+.Pa { env.TACD_SOCK_ROOT }/tacd_{ identifier }.sock .
 If
 .Ev TACD_SOCK_ROOT
 is not specified, it will be set to
@@ -629,7 +629,7 @@ is not specified, it will be set to
 .Pp
 .Xr tacd 8
 will store its pid into
-.Pa {{TACD_PID_ROOT}}/tacd_{{identifier}}.pid .
+.Pa { TACD_PID_ROOT }/tacd_{ identifier }.pid .
 If
 .Ev TACD_PID_ROOT
 is not specified, it will be set to
@@ -726,15 +726,15 @@ type = ["challenge-http-01"]
 cmd = "mkdir"
 args = [
     "-m", "0755",
-    "-p", "{{%if env.HTTP_ROOT}}{{env.HTTP_ROOT}}{{else}}/var/www{{/if}}/{{identifier}}/.well-known/acme-challenge"
+    "-p", "{{ if env.HTTP_ROOT }}{ env.HTTP_ROOT }{{ else }}/var/www{{ endif }}/{ identifier }/.well-known/acme-challenge"
 ]
 
 [[hook]]
 name = "http-01-echo-echo"
 type = ["challenge-http-01"]
 cmd = "echo"
-args = ["{{proof}}"]
-stdout = "{{%if env.HTTP_ROOT}}{{env.HTTP_ROOT}}{{else}}/var/www{{/if}}/{{identifier}}/.well-known/acme-challenge/{{file_name}}"
+args = ["{ proof }"]
+stdout = "{{ if env.HTTP_ROOT }}{ env.HTTP_ROOT }{{ else }}/var/www{{ endif }}/{ identifier }/.well-known/acme-challenge/{ file_name }"
 
 [[hook]]
 name = "http-01-echo-chmod"
@@ -742,7 +742,7 @@ type = ["challenge-http-01-clean"]
 cmd = "chmod"
 args = [
     "a+r",
-    "{{%if env.HTTP_ROOT}}{{env.HTTP_ROOT}}{{else}}/var/www{{/if}}/{{identifier}}/.well-known/acme-challenge/{{file_name}}"
+    "{{ if env.HTTP_ROOT }}{ env.HTTP_ROOT }{{ else }}/var/www{{ endif }}/{ identifier }/.well-known/acme-challenge/{ file_name }"
 ]
 
 [[hook]]
@@ -751,7 +751,7 @@ type = ["challenge-http-01-clean"]
 cmd = "rm"
 args = [
     "-f",
-    "{{%if env.HTTP_ROOT}}{{env.HTTP_ROOT}}{{else}}/var/www{{/if}}/{{identifier}}/.well-known/acme-challenge/{{file_name}}"
+    "{{ if env.HTTP_ROOT }}{ env.HTTP_ROOT }{{ else }}/var/www{{ endif }}/{ identifier }/.well-known/acme-challenge/{ file_name }"
 ]
 .Ed
 .Pp
@@ -784,12 +784,12 @@ args = [
     "-f", "noreply.certs@example.net",
     "contact@example.net"
 ]
-stdin_str = """Subject: Certificate renewal {{#if is_success}}succeeded{{else}}failed{{/if}} for {{identifiers.[0]}}
+stdin_str = """Subject: Certificate renewal {{ if is_success }}succeeded{{ else }}failed{{ endif }} for { identifiers.0 }
 
-The following certificate has {{#unless is_success}}*not* {{/unless}}been renewed.
-identifiers: {{#each identifiers}}{{#if @index}}, {{/if}}{{this}}{{/each}}
-key type: {{key_type}}
-status: {{status}}"""
+The following certificate has {{ if not is_success }}*not* {{ endif }}been renewed.
+identifiers: {{ for ident in identifiers}}{{ if @index }}, {{ endif }}{ ident }{{ endfor}}
+key type: { key_type }
+status: { status }"""
 .Ed
 .Sh SEE ALSO
 .Xr acmed 8 ,
@@ -805,9 +805,9 @@ status: {{status}}"""
 .Re
 .It
 .Rs
-.%A Yehuda Katz
-.%T Handlebars
-.%U https://handlebarsjs.com/
+.%A Brook Heisler
+.%T TinyTemplate
+.%U https://docs.rs/tinytemplate/latest/tinytemplate/syntax/index.html
 .Re
 .It
 .Rs