diff --git a/.github/workflows/check-old.yaml b/.github/workflows/check-old.yaml
index ad8ec904..58bfe1a9 100644
--- a/.github/workflows/check-old.yaml
+++ b/.github/workflows/check-old.yaml
@@ -94,7 +94,7 @@ jobs:
         uses: actions/cache@v2
         with:
           path: ${{ env.R_LIBS_USER }}
-          key: ${{ matrix.config.os }}-r-${{ matrix.config.r }}-v4
+          key: ${{ matrix.config.os }}-r-${{ matrix.config.r }}-v5
 
       - name: Install R dependencies
         if: always()
diff --git a/DESCRIPTION b/DESCRIPTION
index 55d22b7d..8c494af4 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: AMR
-Version: 1.8.2.9073
-Date: 2022-12-28
+Version: 1.8.2.9074
+Date: 2022-12-29
 Title: Antimicrobial Resistance Data Analysis
 Description: Functions to simplify and standardise antimicrobial resistance (AMR)
   data analysis and to work with microbial and antimicrobial properties by
diff --git a/NEWS.md b/NEWS.md
index b91ba92f..7f3d8c87 100755
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,4 +1,4 @@
-# AMR 1.8.2.9073
+# AMR 1.8.2.9074
 
 *(this beta version will eventually become v2.0! We're happy to reach a new major milestone soon!)*
 
diff --git a/R/zzz.R b/R/zzz.R
index 91fa51ad..dcf1dbbb 100755
--- a/R/zzz.R
+++ b/R/zzz.R
@@ -184,7 +184,9 @@ if (utf8_supported && !is_latex) {
   AMR_env$AB_lookup <- create_AB_lookup()
   AMR_env$AV_lookup <- create_AV_lookup()
   AMR_env$MO_lookup <- create_MO_lookup()
-  
+}
+
+.onAttach <- function(lib, pkg) {
   # if custom ab option is available, load it
   if (!is.null(getOption("AMR_custom_ab")) && file.exists(getOption("AMR_custom_ab", default = ""))) {
     packageStartupMessage("Adding custom antimicrobials from '", getOption("AMR_custom_ab"), "'...", appendLF = FALSE)