diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 905ebb2..c525c05 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -50,7 +50,7 @@ repos:
     - id: add-trailing-comma
 
 - repo: https://github.com/astral-sh/ruff-pre-commit
-  rev: v0.6.3
+  rev: v0.6.5
   hooks:
     - id: ruff
       args: ["--fix", "--show-fixes"]
@@ -73,7 +73,7 @@ repos:
     - id: nb-strip-paths
 
 - repo: https://github.com/tox-dev/pyproject-fmt
-  rev: 2.2.1
+  rev: 2.2.4
   hooks:
     - id: pyproject-fmt
 
diff --git a/erddapy/core/url.py b/erddapy/core/url.py
index 7acec64..a387666 100644
--- a/erddapy/core/url.py
+++ b/erddapy/core/url.py
@@ -23,6 +23,15 @@
 OptionalList = list[str] | tuple[str] | None
 
 
+def quote_url(url: str) -> str:
+    """Quote URL args for modern ERDDAP servers."""
+    # We should always quote for queries.
+    if "?" in url and not "searchFor":
+        base, unquoted = url.split("?")
+        url = f"{base}?{parse.quote_plus(unquoted)}"
+    return url
+
+
 def _sort_url(url: str) -> str:
     """Return a URL with sorted variables and constraints for hashing."""
     parts = parse.urlparse(url)
@@ -48,7 +57,12 @@ def _sort_url(url: str) -> str:
 def _urlopen(url: str, auth: tuple | None = None, **kwargs: dict) -> BinaryIO:
     if "timeout" not in kwargs:
         kwargs["timeout"] = 60
-    response = httpx.get(url, follow_redirects=True, auth=auth, **kwargs)
+    response = httpx.get(
+        quote_url(url),
+        follow_redirects=True,
+        auth=auth,
+        **kwargs,
+    )
     try:
         response.raise_for_status()
     except httpx.HTTPError as err: