diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index fdd8e57..73a08d3 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -42,7 +42,7 @@ repos:
         name: Sort imports
 
   - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: v0.0.292
+    rev: v0.1.4
     hooks:
       - id: ruff
         args: [--exit-non-zero-on-fix, --fix, --line-length=180]
diff --git a/docs/confidence.rst b/docs/confidence.rst
index 05edea8..accd877 100644
--- a/docs/confidence.rst
+++ b/docs/confidence.rst
@@ -79,7 +79,7 @@ is calculated as follows:
 
 -  The upper and lower confidence intervals of this distribution can be
    calculated using the confidence interval equation for a sample given
-   by :math:`CI = z \frac{\sigma}{\sqrt{n}}` where :math:`z, \sigma, and
+   by :math:`CI = z \frac{\sigma}{\sqrt{n}}` where :math:`z, \sigma,
    n` the t-distribution critical value for a selected confidence level
    for a sample size, the standard deviation of the distribution, and
    the number of datapoints within the sample respectively.