diff --git a/tox.ini b/tox.ini
index e65ec6c4f..f6dd7806f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,7 +22,7 @@ passenv =
     TMPDIR
 conda_deps =
     asdf>=2.7,!=2.10.0
-    astropy>=4.3,!=5.3.0,!=6.1.5,!=6.1.6,!=7.0.0
+    astropy>=4.3,!=5.3.0,!=6.1.5,!=6.1.6
     astroquery>=0.4
     astroscrappy>=1.1
     bokeh>=3.0
@@ -32,7 +32,7 @@ conda_deps =
     cython>=0.29
     docutils>=0.15
     future>=0.17
-    gwcs>=0.15
+    gwcs==0.22.1
     holoviews>=1.14
     jinja2>=3.0
     jsonschema>=3.0