diff --git a/docs/conf.py b/docs/conf.py
index 5f8378c..8486e1f 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -30,13 +30,10 @@
 
 html_static_path = ["_static"]
 
-on_rtd = os.environ.get("READTHEDOCS", None) == "True"
-if not on_rtd:
-    # Import and set the theme if we're building docs locally
-    import sphinx_rtd_theme
+# Import and set the theme if we're building docs locally
+import sphinx_rtd_theme
 
-    html_theme = "sphinx_rtd_theme"
-    html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
+html_theme = "sphinx_rtd_theme"
 
 # Autodoc options
 autodoc_member_order = "groupwise"
diff --git a/src/pyhepmc/_deprecated.py b/src/pyhepmc/_deprecated.py
index dc788e7..3f3809f 100644
--- a/src/pyhepmc/_deprecated.py
+++ b/src/pyhepmc/_deprecated.py
@@ -14,13 +14,10 @@ def __init__(self, reason: str, removal: str = ""):
         self.removal = Version(removal) if removal else None
 
     def __call__(self, func: Callable[..., Any]) -> Callable[..., Any]:
-        category: Any = FutureWarning
+        category: Any = DeprecationWarning
         extra = ""
-        if self.removal:
-            vstring = ".".join(str(x) for x in self.removal)
-            extra = f" and will be removed in version {vstring}"
-            if CURRENT_VERSION >= self.removal:
-                category = DeprecationWarning
+        if self.removal and CURRENT_VERSION < self.removal:
+            extra = f" and will be removed in version {self.removal}"
         msg = f"{func.__name__} is deprecated{extra}: {self.reason}"
 
         def decorated_func(*args: Any, **kwargs: Any) -> Any:
diff --git a/tests/test_deprecated.py b/tests/test_deprecated.py
index 3389aee..bf0d171 100644
--- a/tests/test_deprecated.py
+++ b/tests/test_deprecated.py
@@ -25,7 +25,7 @@ def bad(self):
         foo.bar()
 
     with pytest.warns(
-        FutureWarning,
-        match="bar is deprecated and will be removed in version 1000.0.0: use baz",
+        DeprecationWarning,
+        match="foo is deprecated and will be removed in version 1000.0.0: use baz",
     ):
         foo.foo()