diff --git a/libsqlite3-sys/sqlite3/bindgen_bundled_version.rs b/libsqlite3-sys/sqlite3/bindgen_bundled_version.rs
index 4dda73c..f607bc9 100644
--- a/libsqlite3-sys/sqlite3/bindgen_bundled_version.rs
+++ b/libsqlite3-sys/sqlite3/bindgen_bundled_version.rs
@@ -1,9 +1,9 @@
 /* automatically generated by rust-bindgen 0.58.1 */
 
-pub const SQLITE_VERSION: &'static [u8; 7usize] = b"3.35.4\0";
-pub const SQLITE_VERSION_NUMBER: i32 = 3035004;
+pub const SQLITE_VERSION: &'static [u8; 7usize] = b"3.35.5\0";
+pub const SQLITE_VERSION_NUMBER: i32 = 3035005;
 pub const SQLITE_SOURCE_ID: &'static [u8; 85usize] =
-    b"2021-04-02 15:20:15 5d4c65779dab868b285519b19e4cf9d451d50c6048f06f653aa701ec212df45e\0";
+    b"2021-04-19 18:32:05 1b256d97b553a9611efca188a3d995a2fff712759044ba480f9a0c9e98fae886\0";
 pub const SQLITE_OK: i32 = 0;
 pub const SQLITE_ERROR: i32 = 1;
 pub const SQLITE_INTERNAL: i32 = 2;
diff --git a/libsqlite3-sys/sqlite3/sqlite3.c b/libsqlite3-sys/sqlite3/sqlite3.c
index 9fca48f..df53e43 100644
--- a/libsqlite3-sys/sqlite3/sqlite3.c
+++ b/libsqlite3-sys/sqlite3/sqlite3.c
@@ -1,6 +1,6 @@
 /******************************************************************************
 ** This file is an amalgamation of many separate C source files from SQLite
-** version 3.35.4.  By combining all the individual C code files into this
+** version 3.35.5.  By combining all the individual C code files into this
 ** single large file, the entire code can be compiled as a single translation
 ** unit.  This allows many compilers to do optimizations that would not be
 ** possible if the files were compiled separately.  Performance improvements
@@ -1186,9 +1186,9 @@ extern "C" {
 ** [sqlite3_libversion_number()], [sqlite3_sourceid()],
 ** [sqlite_version()] and [sqlite_source_id()].
 */
-#define SQLITE_VERSION        "3.35.4"
-#define SQLITE_VERSION_NUMBER 3035004
-#define SQLITE_SOURCE_ID      "2021-04-02 15:20:15 5d4c65779dab868b285519b19e4cf9d451d50c6048f06f653aa701ec212df45e"
+#define SQLITE_VERSION        "3.35.5"
+#define SQLITE_VERSION_NUMBER 3035005
+#define SQLITE_SOURCE_ID      "2021-04-19 18:32:05 1b256d97b553a9611efca188a3d995a2fff712759044ba480f9a0c9e98fae886"
 
 /*
 ** CAPI3REF: Run-Time Library Version Numbers
@@ -108701,33 +108701,44 @@ SQLITE_PRIVATE void sqlite3AlterDropColumn(Parse *pParse, SrcList *pSrc, Token *
     sqlite3OpenTable(pParse, iCur, iDb, pTab, OP_OpenWrite);
     addr = sqlite3VdbeAddOp1(v, OP_Rewind, iCur); VdbeCoverage(v);
     reg = ++pParse->nMem;
-    pParse->nMem += pTab->nCol;
     if( HasRowid(pTab) ){
       sqlite3VdbeAddOp2(v, OP_Rowid, iCur, reg);
+      pParse->nMem += pTab->nCol;
     }else{
       pPk = sqlite3PrimaryKeyIndex(pTab);
+      pParse->nMem += pPk->nColumn;
+      for(i=0; i<pPk->nKeyCol; i++){
+        sqlite3VdbeAddOp3(v, OP_Column, iCur, i, reg+i+1);
+      }
+      nField = pPk->nKeyCol;
     }
+    regRec = ++pParse->nMem;
     for(i=0; i<pTab->nCol; i++){
       if( i!=iCol && (pTab->aCol[i].colFlags & COLFLAG_VIRTUAL)==0 ){
         int regOut;
         if( pPk ){
           int iPos = sqlite3TableColumnToIndex(pPk, i);
           int iColPos = sqlite3TableColumnToIndex(pPk, iCol);
+          if( iPos<pPk->nKeyCol ) continue;
           regOut = reg+1+iPos-(iPos>iColPos);
         }else{
           regOut = reg+1+nField;
         }
-        sqlite3ExprCodeGetColumnOfTable(v, pTab, iCur, i, regOut);
+        if( i==pTab->iPKey ){
+          sqlite3VdbeAddOp2(v, OP_Null, 0, regOut);
+        }else{
+          sqlite3ExprCodeGetColumnOfTable(v, pTab, iCur, i, regOut);
+        }
         nField++;
       }
     }
-    regRec = reg + pTab->nCol;
     sqlite3VdbeAddOp3(v, OP_MakeRecord, reg+1, nField, regRec);
     if( pPk ){
       sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iCur, regRec, reg+1, pPk->nKeyCol);
     }else{
       sqlite3VdbeAddOp3(v, OP_Insert, iCur, regRec, reg);
     }
+    sqlite3VdbeChangeP5(v, OPFLAG_SAVEPOSITION);
 
     sqlite3VdbeAddOp2(v, OP_Next, iCur, addr+1); VdbeCoverage(v);
     sqlite3VdbeJumpHere(v, addr);
@@ -146904,6 +146915,7 @@ static void whereCombineDisjuncts(
   int op;                /* Operator for the combined expression */
   int idxNew;            /* Index in pWC of the next virtual term */
 
+  if( (pOne->wtFlags | pTwo->wtFlags) & TERM_VNULL ) return;
   if( (pOne->eOperator & (WO_EQ|WO_LT|WO_LE|WO_GT|WO_GE))==0 ) return;
   if( (pTwo->eOperator & (WO_EQ|WO_LT|WO_LE|WO_GT|WO_GE))==0 ) return;
   if( (eOp & (WO_EQ|WO_LT|WO_LE))!=eOp
@@ -229294,7 +229306,7 @@ static void fts5SourceIdFunc(
 ){
   assert( nArg==0 );
   UNUSED_PARAM2(nArg, apUnused);
-  sqlite3_result_text(pCtx, "fts5: 2021-04-02 15:20:15 5d4c65779dab868b285519b19e4cf9d451d50c6048f06f653aa701ec212df45e", -1, SQLITE_TRANSIENT);
+  sqlite3_result_text(pCtx, "fts5: 2021-04-19 18:32:05 1b256d97b553a9611efca188a3d995a2fff712759044ba480f9a0c9e98fae886", -1, SQLITE_TRANSIENT);
 }
 
 /*
@@ -234220,9 +234232,9 @@ SQLITE_API int sqlite3_stmt_init(
 #endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_STMTVTAB) */
 
 /************** End of stmt.c ************************************************/
-#if __LINE__!=234223
+#if __LINE__!=234235
 #undef SQLITE_SOURCE_ID
-#define SQLITE_SOURCE_ID      "2021-04-02 15:20:15 5d4c65779dab868b285519b19e4cf9d451d50c6048f06f653aa701ec212dalt2"
+#define SQLITE_SOURCE_ID      "2021-04-19 18:32:05 1b256d97b553a9611efca188a3d995a2fff712759044ba480f9a0c9e98faalt2"
 #endif
 /* Return the source-id for this library */
 SQLITE_API const char *sqlite3_sourceid(void){ return SQLITE_SOURCE_ID; }
diff --git a/libsqlite3-sys/sqlite3/sqlite3.h b/libsqlite3-sys/sqlite3/sqlite3.h
index 21ab5f1..19ee767 100644
--- a/libsqlite3-sys/sqlite3/sqlite3.h
+++ b/libsqlite3-sys/sqlite3/sqlite3.h
@@ -123,9 +123,9 @@ extern "C" {
 ** [sqlite3_libversion_number()], [sqlite3_sourceid()],
 ** [sqlite_version()] and [sqlite_source_id()].
 */
-#define SQLITE_VERSION        "3.35.4"
-#define SQLITE_VERSION_NUMBER 3035004
-#define SQLITE_SOURCE_ID      "2021-04-02 15:20:15 5d4c65779dab868b285519b19e4cf9d451d50c6048f06f653aa701ec212df45e"
+#define SQLITE_VERSION        "3.35.5"
+#define SQLITE_VERSION_NUMBER 3035005
+#define SQLITE_SOURCE_ID      "2021-04-19 18:32:05 1b256d97b553a9611efca188a3d995a2fff712759044ba480f9a0c9e98fae886"
 
 /*
 ** CAPI3REF: Run-Time Library Version Numbers
diff --git a/libsqlite3-sys/upgrade.sh b/libsqlite3-sys/upgrade.sh
index 4515fe7..4534e98 100755
--- a/libsqlite3-sys/upgrade.sh
+++ b/libsqlite3-sys/upgrade.sh
@@ -12,7 +12,7 @@ export SQLCIPHER_LIB_DIR="$SCRIPT_DIR/sqlcipher"
 export SQLCIPHER_INCLUDE_DIR="$SQLCIPHER_LIB_DIR"
 
 # Download and extract amalgamation
-SQLITE=sqlite-amalgamation-3350400
+SQLITE=sqlite-amalgamation-3350500
 curl -O https://sqlite.org/2021/$SQLITE.zip
 unzip -p "$SQLITE.zip" "$SQLITE/sqlite3.c" > "$SQLITE3_LIB_DIR/sqlite3.c"
 unzip -p "$SQLITE.zip" "$SQLITE/sqlite3.h" > "$SQLITE3_LIB_DIR/sqlite3.h"