diff --git a/.github/workflows/mypy.yaml b/.github/workflows/mypy.yaml
index aeafd52..048a65c 100644
--- a/.github/workflows/mypy.yaml
+++ b/.github/workflows/mypy.yaml
@@ -19,5 +19,10 @@ jobs:
           ${{ runner.os }}-cache-pip-
     - name: Install deps
       run: pip3 install -U tornado pytest pytest-asyncio pytest-httpbin flaky structlog toml aiohttp httpx mypy
+    - name: Run mypy for --install-types
+      run: PATH=$HOME/.local/bin:$PATH mypy nvchecker nvchecker_source tests
+      continue-on-error: true
+    - name: Install types
+      run: PATH=$HOME/.local/bin:$PATH yes | mypy --install-types
     - name: Run mypy
       run: PATH=$HOME/.local/bin:$PATH mypy nvchecker nvchecker_source tests
diff --git a/docs/api.rst b/docs/api.rst
index 8cc4c0f..3783ce2 100644
--- a/docs/api.rst
+++ b/docs/api.rst
@@ -18,6 +18,7 @@
 .. autodata:: nvchecker.api.proxy
 .. autodata:: nvchecker.api.user_agent
 .. autodata:: nvchecker.api.tries
+.. autodata:: nvchecker.api.verify_cert
 
 .. py:data:: nvchecker.api.entry_waiter
    :type: contextvars.ContextVar
diff --git a/docs/usage.rst b/docs/usage.rst
index a03a3a4..001c0a7 100644
--- a/docs/usage.rst
+++ b/docs/usage.rst
@@ -185,6 +185,9 @@ httptoken
 
   In the keyfile add ``httptoken_{name}`` token.
 
+verify_cert
+  Whether to verify the HTTPS certificate or not. Default is ``true``.
+
 If both ``prefix`` and ``from_pattern``/``to_pattern`` are used,
 ``from_pattern``/``to_pattern`` are ignored. If you want to strip the prefix
 and then do something special, just use ``from_pattern```/``to_pattern``. For
diff --git a/nvchecker/ctxvars.py b/nvchecker/ctxvars.py
index eb82a29..5389607 100644
--- a/nvchecker/ctxvars.py
+++ b/nvchecker/ctxvars.py
@@ -18,3 +18,4 @@ proxy: ContextVar[Optional[str]] = ContextVar('proxy', default=None)
 user_agent = ContextVar('user_agent', default=DEFAULT_USER_AGENT)
 httptoken = ContextVar('httptoken', default=None)
 entry_waiter: ContextVar[EntryWaiter] = ContextVar('entry_waiter')
+verify_cert = ContextVar('verify_cert', default=True)
diff --git a/nvchecker/httpclient/aiohttp_httpclient.py b/nvchecker/httpclient/aiohttp_httpclient.py
index f908bb7..a122571 100644
--- a/nvchecker/httpclient/aiohttp_httpclient.py
+++ b/nvchecker/httpclient/aiohttp_httpclient.py
@@ -35,12 +35,15 @@ class AiohttpSession(BaseSession):
     follow_redirects: bool = True,
     params = (),
     json = None,
+    verify_cert: bool = True,
   ) -> Response:
     kwargs = {
       'headers': headers,
       'params': params,
       'allow_redirects': follow_redirects,
     }
+    if not verify_cert:
+      kwargs['ssl'] = False
 
     if proxy is not None:
       kwargs['proxy'] = proxy
diff --git a/nvchecker/httpclient/base.py b/nvchecker/httpclient/base.py
index 2c14938..b9e2101 100644
--- a/nvchecker/httpclient/base.py
+++ b/nvchecker/httpclient/base.py
@@ -5,7 +5,7 @@ import structlog
 from typing import Optional, Dict, Mapping
 import json as _json
 
-from ..ctxvars import tries, proxy, user_agent, httptoken
+from ..ctxvars import tries, proxy, user_agent, httptoken, verify_cert
 
 logger = structlog.get_logger(logger_name=__name__)
 
@@ -66,6 +66,7 @@ class BaseSession:
     p = proxy.get()
     ua = user_agent.get()
     httpt = httptoken.get()
+    verify = verify_cert.get()
 
     headers = headers.copy()
     headers.setdefault('User-Agent', ua)
@@ -82,6 +83,7 @@ class BaseSession:
           follow_redirects = follow_redirects,
           json = json,
           proxy = p or None,
+          verify_cert = verify,
         )
       except TemporaryError as e:
         if i == t:
@@ -101,6 +103,7 @@ class BaseSession:
     follow_redirects: bool = True,
     params = (),
     json = None,
+    verify_cert: bool = True,
   ) -> Response:
     ''':meta private:'''
     raise NotImplementedError
diff --git a/nvchecker/httpclient/httpx_httpclient.py b/nvchecker/httpclient/httpx_httpclient.py
index 063be2a..7cf2345 100644
--- a/nvchecker/httpclient/httpx_httpclient.py
+++ b/nvchecker/httpclient/httpx_httpclient.py
@@ -2,7 +2,7 @@
 # Copyright (c) 2020 lilydjwg <lilydjwg@gmail.com>, et al.
 
 import atexit
-from typing import Dict, Optional
+from typing import Dict, Optional, Tuple
 
 import httpx
 
@@ -16,7 +16,7 @@ class HttpxSession(BaseSession):
     concurreny: int = 20,
     timeout: int = 20,
   ) -> None:
-    self.clients: Dict[Optional[str], httpx.AsyncClient] = {}
+    self.clients: Dict[Tuple[Optional[str], bool], httpx.AsyncClient] = {}
     self.timeout = timeout
 
   async def request_impl(
@@ -27,15 +27,17 @@ class HttpxSession(BaseSession):
     follow_redirects: bool = True,
     params = (),
     json = None,
+    verify_cert: bool = True,
   ) -> Response:
-    client = self.clients.get(proxy)
+    client = self.clients.get((proxy, verify_cert))
     if not client:
       client = httpx.AsyncClient(
         timeout = httpx.Timeout(self.timeout, pool=None),
         http2 = True,
         proxies = {'all://': proxy},
+        verify = verify_cert,
       )
-      self.clients[proxy] = client
+      self.clients[(proxy, verify_cert)] = client
 
     try:
       r = await client.request(
diff --git a/nvchecker/httpclient/tornado_httpclient.py b/nvchecker/httpclient/tornado_httpclient.py
index 9c9058a..6d5240c 100644
--- a/nvchecker/httpclient/tornado_httpclient.py
+++ b/nvchecker/httpclient/tornado_httpclient.py
@@ -52,12 +52,14 @@ class TornadoSession(BaseSession):
     follow_redirects: bool = True,
     params = (),
     json = None,
+    verify_cert: bool = True,
   ) -> Response:
     kwargs: Dict[str, Any] = {
       'method': method,
       'headers': headers,
       'request_timeout': self.timeout,
       'follow_redirects': follow_redirects,
+      'validate_cert': verify_cert,
     }
 
     if json:
diff --git a/nvchecker/util.py b/nvchecker/util.py
index 1184e00..16d72c8 100644
--- a/nvchecker/util.py
+++ b/nvchecker/util.py
@@ -22,6 +22,7 @@ from .ctxvars import tries as ctx_tries
 from .ctxvars import proxy as ctx_proxy
 from .ctxvars import user_agent as ctx_ua
 from .ctxvars import httptoken as ctx_httpt
+from .ctxvars import verify_cert as ctx_verify_cert
 
 logger = structlog.get_logger(logger_name=__name__)
 
@@ -252,6 +253,9 @@ class FunctionWorker(BaseWorker):
       httpt = self.keymanager.get_key('httptoken_'+name)
     if httpt is not None:
       ctx_httpt.set(httpt)
+    verify_cert = entry.get('verify_cert', None)
+    if verify_cert is not None:
+      ctx_verify_cert.set(verify_cert)
 
     try:
       async with self.task_sem:
diff --git a/tests/test_anitya.py b/tests/test_anitya.py
index 9fd33e8..402874c 100644
--- a/tests/test_anitya.py
+++ b/tests/test_anitya.py
@@ -9,4 +9,4 @@ async def test_anitya(get_version):
   assert await get_version("shutter", {
     "source": "anitya",
     "anitya": "fedora/shutter",
-  }) == "0.96"
+  }) == "0.97"
diff --git a/tests/test_regex.py b/tests/test_regex.py
index 739700c..97a9af7 100644
--- a/tests/test_regex.py
+++ b/tests/test_regex.py
@@ -58,3 +58,24 @@ async def test_regex_with_tokenBearer(get_version, httpbin):
         "httptoken": "Bearer username:password",
         "regex": r'"token":"([a-w]+):.*"',
     }) == "username"
+
+async def test_regex_no_verify_ssl(get_version, httpbin_secure):
+    assert await get_version("example", {
+        "source": "regex",
+        "url": httpbin_secure.url + "/base64/" + base64_encode("version 1.12 released"),
+        "regex": r'version ([0-9.]+)',
+        "verify_cert": False,
+    }) == "1.12"
+
+async def test_regex_bad_ssl(get_version, httpbin_secure):
+    try:
+        await get_version("example", {
+            "source": "regex",
+            "url": httpbin_secure.url + "/base64/" + base64_encode("version 1.12 released"),
+            "regex": r'version ([0-9.]+)',
+        })
+    except Exception:
+        pass
+    else:
+        assert False, 'certificate should not be trusted'
+