diff --git a/README.md b/README.md
index 96250f27..9731c849 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ Prior to installing the package, you will need to install the packages which run
 ```{r gh-installation, eval = FALSE}
 #install.packages("devtools")
 devtools::install_github("GLEON/rLakeAnalyzer")
-devtools::install_github("aemon-j/GLM3r", ref = "v3.1.0a3")
+devtools::install_github("aemon-j/GLM3r", ref = "v3.1.1")
 devtools::install_github("USGS-R/glmtools", ref = "ggplot_overhaul")
 devtools::install_github("aemon-j/FLakeR", ref = "inflow")
 devtools::install_github("aemon-j/GOTMr")