diff --git a/.gitea/workflows/validate.yaml b/.gitea/workflows/validate.yaml
index a922e39..4f64dc8 100644
--- a/.gitea/workflows/validate.yaml
+++ b/.gitea/workflows/validate.yaml
@@ -16,8 +16,10 @@ jobs:
           echo "http://dl-cdn.alpinelinux.org/alpine/edge/main" >> /etc/apk/repositories
           echo "http://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories
 
+          # determine correct clang version and then install it
           apk update
-          apk add --no-cache llvm19 clang19 clang19-analyzer compiler-rt valgrind
+          RT_VERSION=$(apk search -v compiler-rt | grep -o "compiler-rt-[0-9]*" | head -1 | grep -o "[0-9]*")
+          apk add --no-cache llvm${RT_VERSION} clang${RT_VERSION} clang${RT_VERSION}-analyzer compiler-rt valgrind
 
           # Verify versions
           echo "---------------------"
diff --git a/.gitignore b/.gitignore
index ab02f7f..e025a97 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,5 @@
 *.o
 *.d
 /core
-/oas
-/oas-asan
-/oas-msan
+/build
 /reports
diff --git a/Makefile b/Makefile
index 1983303..a6b1f0b 100644
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,7 @@ asan:
 msan:
 	make -rRf make/msan.mk all
 
-validate: asan msan debug
+validate: asan msan debug release
 	./validate.sh
 
 analyze:
diff --git a/make/release.mk b/make/release.mk
index 606940c..d58017b 100644
--- a/make/release.mk
+++ b/make/release.mk
@@ -1,4 +1,4 @@
-CFLAGS?=-Wall -Wextra -Wpedantic -O2 -std=c23 -flto -fomit-frame-pointer -DNDEBUG -D_POSIX_C_SOURCE=200809L
+CFLAGS?=-Wall -Wextra -Wpedantic -Werror -O2 -std=c23 -flto -fomit-frame-pointer -DNDEBUG -D_POSIX_C_SOURCE=200809L
 LDFLAGS?=-flto -s -Wl,--gc-sections
 BUILD_DIR?=build/release/
 
diff --git a/src/ast.c b/src/ast.c
index d9275f7..4691264 100644
--- a/src/ast.c
+++ b/src/ast.c
@@ -17,10 +17,6 @@ error_t *ast_node_alloc(ast_node_t **output) {
     return nullptr;
 }
 
-void ast_node_free_value(ast_node_t *node) {
-    // TODO: decide how value ownership will work and clean it up here
-}
-
 void ast_node_free(ast_node_t *node) {
     if (node == nullptr)
         return;
@@ -30,8 +26,6 @@ void ast_node_free(ast_node_t *node) {
         free(node->children);
     }
 
-    ast_node_free_value(node);
-
     memset(node, 0, sizeof(ast_node_t));
     free(node);
 }
diff --git a/src/lexer.c b/src/lexer.c
index 94087b6..292befe 100644
--- a/src/lexer.c
+++ b/src/lexer.c
@@ -136,7 +136,7 @@ error_t *lexer_open(lexer_t *lex, char *path) {
  *
  * @pre There must be at least n characters in the input buffer
  */
-void lexer_shift_buffer(lexer_t *lex, int n) {
+void lexer_shift_buffer(lexer_t *lex, size_t n) {
     assert(lex->buffer_count >= n);
     lex->buffer_count -= n;
     memmove(lex->buffer, lex->buffer + n, lex->buffer_count);