diff --git a/src/3rdparty/libethash/ethash.h b/src/3rdparty/libethash/ethash.h
index c65cb7c666..05b8d640a4 100644
--- a/src/3rdparty/libethash/ethash.h
+++ b/src/3rdparty/libethash/ethash.h
@@ -50,7 +50,7 @@ typedef struct ethash_h256 { uint8_t b[32]; } ethash_h256_t;
 // usage:
 // ethash_h256_t a = ethash_h256_static_init(1, 2, 3, ... )
 // have to provide all 32 values. If you don't provide all the rest
-// will simply be unitialized (not guranteed to be 0)
+// will simply be unitialized (not guaranteed to be 0)
 #define ethash_h256_static_init(...)			\
 	{ {__VA_ARGS__} }
 
diff --git a/src/3rdparty/libethash/ethash_internal.h b/src/3rdparty/libethash/ethash_internal.h
index a1f2df213a..ce0a78e125 100644
--- a/src/3rdparty/libethash/ethash_internal.h
+++ b/src/3rdparty/libethash/ethash_internal.h
@@ -68,7 +68,7 @@ static inline bool ethash_check_difficulty(
  * @param nonce            The block's nonce
  * @param mix_hash         The mix digest hash
  * @param boundary         The boundary is defined as (2^256 / difficulty)
- * @return                 true for succesful pre-verification and false otherwise
+ * @return                 true for successful pre-verification and false otherwise
  */
 bool ethash_quick_check_difficulty(
 	ethash_h256_t const* header_hash,
diff --git a/src/3rdparty/rapidjson/document.h b/src/3rdparty/rapidjson/document.h
index 660e14eb53..efab3fdb63 100644
--- a/src/3rdparty/rapidjson/document.h
+++ b/src/3rdparty/rapidjson/document.h
@@ -1805,7 +1805,7 @@ class GenericValue {
     uint64_t GetUint64() const  { RAPIDJSON_ASSERT(data_.f.flags & kUint64Flag); return data_.n.u64; }
 
     //! Get the value as double type.
-    /*! \note If the value is 64-bit integer type, it may lose precision. Use \c IsLosslessDouble() to check whether the converison is lossless.
+    /*! \note If the value is 64-bit integer type, it may lose precision. Use \c IsLosslessDouble() to check whether the conversion is lossless.
     */
     double GetDouble() const {
         RAPIDJSON_ASSERT(IsNumber());
@@ -1817,7 +1817,7 @@ class GenericValue {
     }
 
     //! Get the value as float type.
-    /*! \note If the value is 64-bit integer type, it may lose precision. Use \c IsLosslessFloat() to check whether the converison is lossless.
+    /*! \note If the value is 64-bit integer type, it may lose precision. Use \c IsLosslessFloat() to check whether the conversion is lossless.
     */
     float GetFloat() const {
         return static_cast<float>(GetDouble());
diff --git a/src/3rdparty/rapidjson/reader.h b/src/3rdparty/rapidjson/reader.h
index 542b7c00cb..f8499a8c99 100644
--- a/src/3rdparty/rapidjson/reader.h
+++ b/src/3rdparty/rapidjson/reader.h
@@ -1002,7 +1002,7 @@ class GenericReader {
 //!@endcond
 
         for (;;) {
-            // Scan and copy string before "\\\"" or < 0x20. This is an optional optimzation.
+            // Scan and copy string before "\\\"" or < 0x20. This is an optional optimization.
             if (!(parseFlags & kParseValidateEncodingFlag))
                 ScanCopyUnescapedString(is, os);