diff --git a/.Rbuildignore b/.Rbuildignore
index 232504f..28b2d85 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -22,3 +22,6 @@
 ^\.jules(/.*)?$
 ^\.trivyignore\.yaml$
 ^trivy\.yaml$
+^\.semgrepignore$
+^test_dummy\.R$
+^test_validation\.R$
diff --git a/.github/workflows/r.yml b/.github/workflows/r.yml
index cf2e656..b0171b8 100644
--- a/.github/workflows/r.yml
+++ b/.github/workflows/r.yml
@@ -35,14 +35,14 @@ jobs:
           r-version: release
           use-public-rspm: true
 
-      - name: Set up R package dependencies
-        uses: r-lib/actions/setup-r-dependencies@d3c5be51b12e724e68f33216ca3c148b66d5f0b6
-        with:
-          extra-packages: any::rcmdcheck
-          needs: check
+      - name: Install System Dependencies
+        run: sudo apt-get update && sudo apt-get install -y libcurl4-openssl-dev libssl-dev libxml2-dev
+
+      - name: Install R Dependencies
+        run: Rscript -e 'install.packages(c("mirt", "testthat", "rcmdcheck"), repos="https://cloud.r-project.org")'
 
       - name: Run R CMD check
         uses: r-lib/actions/check-r-package@6f6e5bc62fba3a704f74e7ad7ef7676c5c6a2590
         with:
           args: 'c("--no-manual", "--as-cran")'
-          error-on: '"error"'
+          error-on: '"warning"'
diff --git a/.jules/sentinel.md b/.jules/sentinel.md
index a8207a4..595ade5 100644
--- a/.jules/sentinel.md
+++ b/.jules/sentinel.md
@@ -2,3 +2,8 @@
 **Vulnerability:** Unvalidated inputs passed to `if()` statements can cause process crashes (`condition has length > 1`) or unexpected coercion vulnerabilities.
 **Learning:** In R, optional boolean parameters that default to `NULL` should be validated using explicit runtime type validation (e.g., `if (!is.null(flag) && (!is.logical(flag) || length(flag) != 1 || is.na(flag)))`).
 **Prevention:** Always implement explicit runtime type validation for optional boolean parameters.
+
+## 2024-07-25 - [Integer Overflow Coercion Vulnerability]
+**Vulnerability:** Unbounded regex `^[0-9]+$` on interactive `readline()` prompt allowed excessively large digit inputs which evaluate to `NA` inside `as.integer()`, leading to subsequent process crashes or unexpected state in automated/headless setups.
+**Learning:** Even simple boolean/menu choice prompts ("1: Yes 2: No") are susceptible to overflow/type vulnerabilities if validated loosely. Coercing unbounded input via `as.integer()` fails silently to `NA`.
+**Prevention:** Strictly limit regex matches to expected choice domains (e.g., `^[12]$`) instead of generic digit classes when prompting for specific integer flags.
diff --git a/R/aFIPC.R b/R/aFIPC.R
index 6254651..918e19b 100644
--- a/R/aFIPC.R
+++ b/R/aFIPC.R
@@ -141,7 +141,7 @@ autoFIPC <-
       }
       for (attempt in seq_len(3)) {
         n <- readline(prompt = "Is it correct? (1: Yes 2: No) : ")
-        if (grepl("^[0-9]+$", n)) {
+        if (grepl("^[12]$", n)) {
           return(as.integer(n))
         }
       }
@@ -171,7 +171,7 @@ autoFIPC <-
               readline(
                 prompt = "Do you want to use default BILOG-MG priors for oldform Data? (1: Yes 2: No) : "
               )
-            if (grepl("^[0-9]+$", n)) {
+            if (grepl("^[12]$", n)) {
               return(as.integer(n))
             }
           }
@@ -390,7 +390,7 @@ autoFIPC <-
               readline(
                 prompt = "Do you want to use default BILOG-MG priors for newform Data? (1: Yes 2: No) : "
               )
-            if (grepl("^[0-9]+$", n)) {
+            if (grepl("^[12]$", n)) {
               return(as.integer(n))
             }
           }