Update tox.ini

tox.ini

@@ -42,16 +42,16 @@ commands =
 
 # list of pre-defined environments. (Technically environments not listed here
 # like build-py312 can also be used.)
-[testenv:pytest-py312-upgraded]
-[testenv:pytest-py312-prerelease]
+[testenv:pytest-py313-upgraded]
+[testenv:pytest-py313-prerelease]
 [testenv:pytest-py311-optional-pinned]  # some optional reqs not compatible with py312 yet
-[testenv:pytest-py{39,310,311,312}-pinned]
+[testenv:pytest-py{39,310,311,312,313}-pinned]
 [testenv:pytest-py39-minimum]
 
-[testenv:gallery-py312-upgraded]
-[testenv:gallery-py312-prerelease]
+[testenv:gallery-py313-upgraded]
+[testenv:gallery-py313-prerelease]
 [testenv:gallery-py311-optional-pinned]
-[testenv:gallery-py{39,310,311,312}-pinned]
+[testenv:gallery-py{39,310,311,312,313}-pinned]
 [testenv:gallery-py39-minimum]
 
 [testenv:build]  # using tox for this so that we can have a clean build environment